Ford Ranger 1998 2WD 3.0L VIN U Workshop Manual

ford :: Ford Truck Ranger 2WD V6-3.0L VIN U (

1998)

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P0500-P05ZZ > P0500 - P0504, ( P0501 P0502 P0503 0500 0501 0502 0503 0504 ) > System Information > System Diagnosis > P0500 ( P 0500 )

P0500 - P0504: Testing and InspectionP0500 ( P 0500 )

For diagnosis of refer to the system experiencing the problem.P0500

Computers and Control Systems or Transmission Control System

Refer to pinpoint test DF1. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DF - Vehicle SpeedCircuit Check

For complete Engine Control diagnostic information, See: Powertrain Management/Computers and Control Systems/Testing and Inspection

Transfer Case

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P0500-P05ZZ > P0500 - P0504, ( P0501 P0502 P0503 0500 0501 0502 0503 0504 ) > System Information

> System Diagnosis > P0500 ( P 0500 ) > Page 9

Ranger 2WD V6-3.0L VIN U (1998)

C1752 - P1833 GEM/CTM Trouble Codes (DTC)

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P0500-P05ZZ > P0500 - P0504, ( P0501 P0502 P0503 0500 0501 0502 0503 0504 ) > System Information

> System Diagnosis > P0500 ( P 0500 ) > Page 10

Ranger 2WD V6-3.0L VIN U (1998)

For complete Transfer Case diagnostic information,

Windshield Wiper

Part 3 Of 4

For complete Windshield Wiper diagnostic information, See: Wiper and Washer Systems/Testing and Inspection

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1400-P14ZZ > P1460 - P1464, ( P1461 P1462 P1463 1460 1461 1462 1463 1464 ) > System Information > System Diagnosis > P1464

P1460 - P1464: Testing and InspectionP1464

For diagnosis of refer to the system experiencing the problem.P1464

Computers and Control Systems or Transmission Control System

Refer to pinpoint test KM19. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/KM - WideOpen Throttle (WOT) A/C Cutoff Relay, A/C Circuits/KM15 - KM19
For complete Engine Control diagnostic information, See: Powertrain Management/Computers and Control Systems/Testing and Inspection

Heating and Air Conditioning

For complete Heating and Air Conditioning diagnostic information, See: Heating and Air Conditioning/Testing and Inspection

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Accessory Delay Module > Accessory Delay Relay > Component Information > Locations

Accessory Delay Relay: Locations

Behind Instrument Panel View

The Accessory Delay Relay is located under RH side of instrument panel.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Accessory Delay Module > Accessory Delay Relay > Component Information > Locations> Page 22

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Specifications

Alarm Module: Specifications

Remote Anti-Theft Personality Module ............................................................................................................................ 10-14 N.m (89-125 Lb-In)(RAP)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Specifications > Page 26

Alarm Module: Locations

Full Body View

The Remote Anti-Theft Personality Module is located at LH rear corner of cab.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Specifications > Page 27

Alarm Module: Diagrams

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Specifications > Page

28

Ranger 2WD V6-3.0L VIN U (1998)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Specifications > Page 29

Alarm Module: Service and Repair
REMOVAL

1. Disconnect the battery ground cable.

Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage may result.CAUTION:

2. Remove the LH rear quarter trim panel.

3. Position the RAP module aside.
1 Remove nuts.
2 Position the module aside.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Specifications > Page

30

Ranger 2WD V6-3.0L VIN U (1998)

4. Remove the RAP module.
1 Disconnect electrical connector.
2 Remove the RAP module.

INSTALLATION

1. To install, reverse the removal procedure.

NOTE:

When the battery is disconnected and reconnected, some abnormal drive symptoms may occur while the vehicle relearns its adaptivestrategy. The vehicle may need to be driven or more to relearn the strategy.16 km (10 mi)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Central Control Module > Component Information > Technical Service Bulletins > GEM/CTM - Erroneous Trouble Codes

Central Control Module: Technical Service BulletinsGEM/CTM - Erroneous Trouble Codes

Article No.98-13-20
07/06/98

DIAGNOSTIC TROUBLE CODES (DTCS) -ERRONEOUS DTCS B1302 AND B1398 - VEHICLES BUILT FROM 4/2/98 - SERVICE TIP

LIGHT TRUCK: 1998 RANGER
ISSUE

1998 Rangers may exhibit erroneous Diagnostic Trouble Codes (DTCs) B1302 and B1398 when diagnostic testing is performed. This may be the resultof Generic Electronic Modules (GEMs) being installed on vehicles instead of Central Timer Modules (CTMs). Vehicles built without the premiumoptions package after 4/2/98 and manufactured at the Edison or Louisville Assembly Plants may contain a GEM in the place of a CTM.
ACTION

Ignore erroneous DTCs that relate to options packages not present on the vehicle and continue with normal diagnosis. Refer to the Service TipInformation for details.
SERVICE TIP INFORMATION

If the vehicle does not have premium options such as "One-Touch-Down Power Windows" and diagnostic testing is performed, erroneous codes to thisoption may be revealed and should be ignored as they are related to GEM features which are NOT present on these vehicles. The GEM should not bereplaced if these codes are present and the vehicle functions properly.

NOTE

IN PRODUCTION, GEMs ARE INSTALLED IN RANGERS WITH PREMIUM OPTION PACKAGES AND CTMs ARE INSTALLED INRANGERS WITHOUT PREMIUM OPTIONS. GEMs WILL REMAIN IN RANGER VEHICLES WITH PREMIUM OPTION PACKAGING INTHE PLACE OF CTMs THROUGH THE REMAINING MODEL YEAR RANGERS (1998).

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 205000

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > Customer Interest: > 99-26-4 > Dec > 99 > Speedometer/

Odometer - Inaccurate/Inoperative

General Module: Customer InterestSpeedometer/Odometer - Inaccurate/Inoperative

Article No.99-26-4
12/27/99

SPEEDOMETER - INACCURATE SPEEDOMETER READINGS

FORD:1998-2000 EXPLORER, MOUNTAINEER, RANGER
This TSB article is being republished in its entirety to include 2000 model year vehicles.

ISSUEThe vehicle odometer/speedometer may be inoperative or inaccurate as well as Malfunction Indicator Lamp (MIL) illuminated after the GenericElectronic Module (GEM), Central Timer Module (CTM), or the 4-Wheel Anti-lock Brake System (4WABS) Module has been replaced. This may becaused by either the GEM, CTM, or the 4WABS Module tire and axle size calibration.

ACTIONReprogram the GEM, CTM, or 4WABS Module to match the vehicle attributes. Refer to the following Service Procedure for details.
SERVICE PROCEDURE

In the event a 1998 through 2000 Ranger GEM/CTM/4WABS or a 1998 through 2000 Explorer/Mountaineer 4WABS/C TM component requiresservice or replacement, the module(s) must be configured for proper operation using a New Generation Star (NGS) Tester and version 6.0 Servicefunction card. If you do not have version 6.0 loaded, use the latest version Service Bay Technical System (SBTS) CD to download NGS ServiceFunction Card Version 6.0 software to the green NGS service card for configuring modules. To configure modules, follow these instructions:

1. SELECT: SERVICE BAY FUNCTIONS

2. SELECT: GEM, CTM or ABS

3. For ABS, proceed to Step 4. For GEM or CTM,
SELECT: CUSTOMER PREFERENCES

4.
SELECT: TIRE SIZE/AXLE RATIOCONFIGURE

a. The NGS Tester will display "DETERMINING MODULE PROTOCOL, PLEASE WAIT"
b. When NGS Tester is ready, press {TRIGGER} to continue.

5. ENTER TIRE SIZE/REVOLUTIONS PER MILE (REV/MILE)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > Customer

Interest: > 99-26-4 > Dec > 99 > Speedometer/Odometer - Inaccurate/Inoperative > Page 43

Ranger 2WD V6-3.0L VIN U (1998)

NOTE

THE TIRE SIZE MUST BE ENTERED AS A REV/MILE CALCULATION. REFER TO THE REV/MILE CHART FOR THE CORRECTCALCULATION.

6. ENTER AXLE/TONE RING SIZE

NOTE

4X2 RANGERS EQUIPPED WITH A 2.5L OR 3.0L ENGINE HAVE A 7.5" AXLE. 4X4 AND 4.0L RANGERS HAVE AN 8.8" AXLE. ALLEXPLORERS/MOUNTAINEERS HAVE AN 8.8" AXLE. IF THE SPECIFIC AXLE CANNOT BE SELECTED, ENTER THE AXLE TONERING TOOTH SIZE USING (00102) FOR 7.5" AXLES AND (00108) FOR 8.8" AXLES.

7. ENTER OPTIONS

NOTE

SELECT 4WABS, RABS, OR NA (IF NOT EQUIPPED).

8. ENTER VEHICLE

9.
SELECT: DONE - The NGS Tester will display "MODULE CONFIGURATION COMPLETE." The module is now properly configured. Press{TRIGGER} to exit.

10. Verify with road test.

OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 99-18-13
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage And Emissions Warranty Coverage
OPERATION DESCRIPTION TIME

992604A Reprogram Generic 0.7 Hr.

Electronic Module (GEM),Central Timer Module(CTM), Or 4-WheelAnti-Lock Brake System(4WABS) Module

DEALER CODING

CONDITION
BASIC PART NO. CODE
14B205 42
2C219 42

OASIS CODES: 201000, 201100, 202000, 204000, 204200, 205000, 206000, 290000, 301000, 508000

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > Customer Interest: > 98-1-21 > Jan > 98 > Power Window -

Downward Travel Is 1-5 Inches

General Module: Customer InterestPower Window - Downward Travel Is 1-5 Inches

Article No. 98-1-21
01/19/98

WINDOW - POWER - DOWNWARD TRAVEL IS ONLY 25-127 MM (1-5 INCHES) WHEN USING ONE-TOUCHDOWN MODE - VEHICLES BUILT THROUGH 1/30/98

LIGHT TRUCK:1998 RANGER

ISSUE: The power window may only travel 25-137 mm (1-5") downward when the one-touchdown mode is activated on some vehicles. This may be due to thecalibration of the Generic Electronic Module (GEM).

ACTION:Remove the GEM and replace with a revised GEM. Refer to the Service Procedure for details.
SERVICE PROCEDURE

: NOTE

WHEN THE BATTERY HAS BEEN DISCONNECTED AND RECONNECTED, SOME ABNORMAL DRIVE SYMPTOMS MAY OCCURWHILE THE POWERTRAIN CONTROL MODULE (PCM) RELEARNS ITS ADAPTIVE STRATEGY. THE VEHICLE MAY NEED TO BEDRIVEN 16 KM (10 MILES) OR MORE TO RELEARN THE STRATEGY.

1. Disconnect battery ground cable.

2. Remove radio. Refer to the 1998 Ranger Workshop Manual, Section 415-00.

3. Remove radio bezel.

4. Remove retaining screw.

5. Slide GEM toward the front of the vehicle, off retaining tabs.

6. Disconnect electrical connectors.

7. Install revised GEM. Refer to Parts Block at end of this article for correct GEM usage.

8. Reverse Steps 1-6 and torque retaining screw to 2.3-3.3 N.m (20.4-29.2 lb-in).

9. Connect the New Generation Star (NGS) Tester to vehicle.

10.

Program the GEM to the attributes of the vehicle. Obtain and insert into NGS Tester the Next Generation Service Pin Card (colored green,Version 1.0 or later).

11. Select GEM, tire size, axle ratio, options (4WABS or RABS), and then select application (Ranger).

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > Customer

Interest: > 98-1-21 > Jan > 98 > Power Window - Downward Travel Is 1-5 Inches > Page 48

Ranger 2WD V6-3.0L VIN U (1998)

12. Disconnect NGS Tester when complete.
PART NUMBER PART NAME

F87Z-14B205-DB Generic Electronic Module (GEM) - 4X2
F87Z-14B205-EB Generic Electronic Module (GEM) - 4X4

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
OPERATION DESCRIPTION TIME

980121A Replace GEM 0.8 Hr.

(Includes Time To Reconfigure For Vehicle Parameters)

DEALER CODING

CONDITION
BASIC PART NO. CODE
148205 42

OASIS CODES: 102000, 205000

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 99-26-4 > Dec > 99 >

Speedometer/Odometer - Inaccurate/Inoperative

General Module: All Technical Service BulletinsSpeedometer/Odometer - Inaccurate/Inoperative

Article No.99-26-4
12/27/99

SPEEDOMETER - INACCURATE SPEEDOMETER READINGS

FORD:1998-2000 EXPLORER, MOUNTAINEER, RANGER
This TSB article is being republished in its entirety to include 2000 model year vehicles.

ISSUEThe vehicle odometer/speedometer may be inoperative or inaccurate as well as Malfunction Indicator Lamp (MIL) illuminated after the GenericElectronic Module (GEM), Central Timer Module (CTM), or the 4-Wheel Anti-lock Brake System (4WABS) Module has been replaced. This may becaused by either the GEM, CTM, or the 4WABS Module tire and axle size calibration.

ACTIONReprogram the GEM, CTM, or 4WABS Module to match the vehicle attributes. Refer to the following Service Procedure for details.
SERVICE PROCEDURE

In the event a 1998 through 2000 Ranger GEM/CTM/4WABS or a 1998 through 2000 Explorer/Mountaineer 4WABS/C TM component requiresservice or replacement, the module(s) must be configured for proper operation using a New Generation Star (NGS) Tester and version 6.0 Servicefunction card. If you do not have version 6.0 loaded, use the latest version Service Bay Technical System (SBTS) CD to download NGS ServiceFunction Card Version 6.0 software to the green NGS service card for configuring modules. To configure modules, follow these instructions:

1. SELECT: SERVICE BAY FUNCTIONS

2. SELECT: GEM, CTM or ABS

3. For ABS, proceed to Step 4. For GEM or CTM,

SELECT: CUSTOMER PREFERENCES

4.

SELECT: TIRE SIZE/AXLE RATIOCONFIGURE
a. The NGS Tester will display "DETERMINING MODULE PROTOCOL, PLEASE WAIT"
b. When NGS Tester is ready, press {TRIGGER} to continue.

5. ENTER TIRE SIZE/REVOLUTIONS PER MILE (REV/MILE)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > All

Technical Service Bulletins: > 99-26-4 > Dec > 99 > Speedometer/Odometer - Inaccurate/Inoperative > Page 54

Ranger 2WD V6-3.0L VIN U (1998)

NOTE

THE TIRE SIZE MUST BE ENTERED AS A REV/MILE CALCULATION. REFER TO THE REV/MILE CHART FOR THE CORRECTCALCULATION.

6. ENTER AXLE/TONE RING SIZE

NOTE

4X2 RANGERS EQUIPPED WITH A 2.5L OR 3.0L ENGINE HAVE A 7.5" AXLE. 4X4 AND 4.0L RANGERS HAVE AN 8.8" AXLE. ALLEXPLORERS/MOUNTAINEERS HAVE AN 8.8" AXLE. IF THE SPECIFIC AXLE CANNOT BE SELECTED, ENTER THE AXLE TONERING TOOTH SIZE USING (00102) FOR 7.5" AXLES AND (00108) FOR 8.8" AXLES.

7. ENTER OPTIONS

NOTE

SELECT 4WABS, RABS, OR NA (IF NOT EQUIPPED).

8. ENTER VEHICLE

9.

SELECT: DONE - The NGS Tester will display "MODULE CONFIGURATION COMPLETE." The module is now properly configured. Press{TRIGGER} to exit.

10. Verify with road test.
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 99-18-13
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage And Emissions Warranty Coverage
OPERATION DESCRIPTION TIME

992604A Reprogram Generic 0.7 Hr.

Electronic Module (GEM),Central Timer Module(CTM), Or 4-WheelAnti-Lock Brake System(4WABS) Module

DEALER CODING

CONDITION
BASIC PART NO. CODE
14B205 42
2C219 42

OASIS CODES: 201000, 201100, 202000, 204000, 204200, 205000, 206000, 290000, 301000, 508000

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 98-13-20 > Jul > 98 > GEM/

CTM - Erroneous Trouble Codes

General Module: All Technical Service BulletinsGEM/CTM - Erroneous Trouble Codes

Article No.98-13-20
07/06/98

DIAGNOSTIC TROUBLE CODES (DTCS) -ERRONEOUS DTCS B1302 AND B1398 - VEHICLES BUILT FROM 4/2/98 - SERVICE TIP

LIGHT TRUCK: 1998 RANGER
ISSUE

1998 Rangers may exhibit erroneous Diagnostic Trouble Codes (DTCs) B1302 and B1398 when diagnostic testing is performed. This may be the resultof Generic Electronic Modules (GEMs) being installed on vehicles instead of Central Timer Modules (CTMs). Vehicles built without the premiumoptions package after 4/2/98 and manufactured at the Edison or Louisville Assembly Plants may contain a GEM in the place of a CTM.
ACTION

Ignore erroneous DTCs that relate to options packages not present on the vehicle and continue with normal diagnosis. Refer to the Service TipInformation for details.
SERVICE TIP INFORMATION

If the vehicle does not have premium options such as "One-Touch-Down Power Windows" and diagnostic testing is performed, erroneous codes to thisoption may be revealed and should be ignored as they are related to GEM features which are NOT present on these vehicles. The GEM should not bereplaced if these codes are present and the vehicle functions properly.

NOTE

IN PRODUCTION, GEMs ARE INSTALLED IN RANGERS WITH PREMIUM OPTION PACKAGES AND CTMs ARE INSTALLED INRANGERS WITHOUT PREMIUM OPTIONS. GEMs WILL REMAIN IN RANGER VEHICLES WITH PREMIUM OPTION PACKAGING INTHE PLACE OF CTMs THROUGH THE REMAINING MODEL YEAR RANGERS (1998).

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 205000

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins: > 98-1-21 > Jan > 98 > Power

Window - Downward Travel Is 1-5 Inches

General Module: All Technical Service BulletinsPower Window - Downward Travel Is 1-5 Inches

Article No. 98-1-21
01/19/98

WINDOW - POWER - DOWNWARD TRAVEL IS ONLY 25-127 MM (1-5 INCHES) WHEN USING ONE-TOUCHDOWN MODE - VEHICLES BUILT THROUGH 1/30/98

LIGHT TRUCK:1998 RANGER

ISSUE: The power window may only travel 25-137 mm (1-5") downward when the one-touchdown mode is activated on some vehicles. This may be due to thecalibration of the Generic Electronic Module (GEM).

ACTION:Remove the GEM and replace with a revised GEM. Refer to the Service Procedure for details.
SERVICE PROCEDURE

: NOTE

WHEN THE BATTERY HAS BEEN DISCONNECTED AND RECONNECTED, SOME ABNORMAL DRIVE SYMPTOMS MAY OCCURWHILE THE POWERTRAIN CONTROL MODULE (PCM) RELEARNS ITS ADAPTIVE STRATEGY. THE VEHICLE MAY NEED TO BEDRIVEN 16 KM (10 MILES) OR MORE TO RELEARN THE STRATEGY.

1. Disconnect battery ground cable.

2. Remove radio. Refer to the 1998 Ranger Workshop Manual, Section 415-00.

3. Remove radio bezel.

4. Remove retaining screw.

5. Slide GEM toward the front of the vehicle, off retaining tabs.

6. Disconnect electrical connectors.

7. Install revised GEM. Refer to Parts Block at end of this article for correct GEM usage.

8. Reverse Steps 1-6 and torque retaining screw to 2.3-3.3 N.m (20.4-29.2 lb-in).

9. Connect the New Generation Star (NGS) Tester to vehicle.

10.

Program the GEM to the attributes of the vehicle. Obtain and insert into NGS Tester the Next Generation Service Pin Card (colored green,Version 1.0 or later).

11. Select GEM, tire size, axle ratio, options (4WABS or RABS), and then select application (Ranger).

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > All

Technical Service Bulletins: > 98-1-21 > Jan > 98 > Power Window - Downward Travel Is 1-5 Inches > Page 63

Ranger 2WD V6-3.0L VIN U (1998)

12. Disconnect NGS Tester when complete.
PART NUMBER PART NAME

F87Z-14B205-DB Generic Electronic Module (GEM) - 4X2
F87Z-14B205-EB Generic Electronic Module (GEM) - 4X4

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
OPERATION DESCRIPTION TIME

980121A Replace GEM 0.8 Hr.

(Includes Time To Reconfigure For Vehicle Parameters)

DEALER CODING

CONDITION
BASIC PART NO. CODE
148205 42

OASIS CODES: 102000, 205000

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for General Module: > 98-23-10 >

Nov > 98 > Engine - Lean Driveability Symptoms

Air Flow Meter/Sensor: All Technical Service BulletinsEngine - Lean Driveability Symptoms

Article No.98-23-10
11/23/98

MASS AIR FLOW (MAF) - SENSORCONTAMINATION - SERVICE TIP

FORD:1990-97 THUNDERBIRD1990-99 MUSTANG, TAURUS SHO1991-99 CROWN VICTORIA, ESCORT, TAURUS1992-94 TEMPO1993-97 PROBE1995-99 CONTOUR

LINCOLN-MERCURY:1990-97 COUGAR1991-99 CONTINENTAL, GRAND MARQUIS, SABLE, TOWN CAR, TRACER1992-94 TOPAZ1993-98 MARK VIII1995-99 MYSTIQUE

LIGHT TRUCK: 1990 BRONCO II1990-97 AEROSTAR1990-99 RANGER1991-99 EXPLORER1994-96 BRONCO1994-97 F SUPER DUTY, F-250 HD1994-99 ECONOLINE, F-150, F-250 LD, F-3501995-99 WINDSTAR1997-99 EXPEDITION, MOUNTAINEER1998-99 NAVIGATOR1999 F-250 HD, SUPER DUTY F SERIES

ACTIONFollow the diagnostic procedures described in the following Service Tip. The revised diagnostic procedure is a more accurate means of diagnosing thesymptoms.
SERVICE TIP

MASS AIR FLOW (MAF) DISCUSSION

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > All Other

Service Bulletins for General Module: > 98-23-10 > Nov > 98 > Engine - Lean Driveability Symptoms > Page 69

Ranger 2WD V6-3.0L VIN U (1998)

ISSUEThis TSB article is a diagnostic procedure to address vehicles that exhibit lean driveability symptoms and may or may not have any Diagnostic TroubleCodes (DTCs) stored in memory.

MAF sensors can get contaminated from a variety of sources: dirt, oil, silicon, spider webs, potting compound from the sensor itself, etc. When a MAF sensor gets contaminated, it skews the transfer function such that the sensor over-estimates air flow at idle (causes the fuel system to go rich) andunder-estimates air flow at high air flows (causes fuel system to go lean). This means Long Term Fuel Trims will learn lean (negative) corrections at idleand learn rich (positive) corrections at higher air flows.

If vehicle is driven at Wide Open Throttle (WOT) or high loads, the fuel system normally goes open loop rich to provide maximum power. If the MAFsensor is contaminated, the fuel system will actually be lean because of under-estimated air flow. During open loop fuel operation, the vehicle appliesLong Term Fuel Trim corrections that have been learned during closed loop operation. These corrections are often lean corrections learned at lower airflows. This combination of under-estimated air flow and lean fuel trim corrections can result in spark knock/detonation and lack of power concerns atWOT and high loads.

One of the indicators for diagnosing this condition is barometric pressure. Barometric pressure (BARO) is inferred by the Powertrain Control Module(PCM) software at part throttle and WOT (there is no actual BARO sensor on MAF-equipped vehicles, except for the 3.8L Supercharged engine). Athigh air flows, a contaminated MAF sensor will under-estimate air flow coming into the engine, hence the PCM infers that the vehicle is operating at ahigher altitude. The BARO reading is stored in Keep Alive Memory (KAM) after it is updated. Other indicators are Long Term Fuel Trim and MAF

voltage at idle.

NOTE

THE FOLLOWING PROCEDURE MAY ALSO BE USED TO DIAGNOSE VEHICLES THAT DO NOT HAVE FUEL SYSTEM/HO2SSENSOR DTCS.

Symptoms
^ Lack of Power
^ Spark Knock/Detonation
^ Buck/Jerk
^ Hesitation/Surge on Acceleration
^ Malfunction Indicator Lamp (MIL) Illuminated -

DTCs P0171, P0172, P0174, P0175 may be stored in memory
OBDII DTCs
^ P0171, P0174 (Fuel system lean, Bank 1 or 2)
^ P0172, P0175, (Fuel system rich, Bank 1 or 2)
^ P1130, P1131, P1132, (HO2S11 lack of switching, Bank 1)
^ P1150, P1151, P1152, (HO2S21 lack of switching, Bank 2)
OBDI DTCs
^ 181, 189 (Fuel system lean, Bank 1 or 2)
^ 179, 188 (Fuel system rich, Bank 1 or 2)
^ 171, 172, 173 (HO2S11 lack of switching, Bank 1)
^ 175, 176, 177 (HO2S21 lack of switching, Bank 2)
^ 184, 185 (MAF higher/lower than expected)
^ 186, 187 (Injector pulse width higher/lower than expected)

:NOTE

DO NOT DISCONNECT THE BATTERY. IT WILL ERASE KEEP ALIVE MEMORY AND RESET LONG TERM FUEL TRIM AND BAROTO THEIR STARTING/BASE VALUES. THE BARO PARAMETER IDENTIFICATION DISPLAY (PID) IS USED FOR THIS DIAGNOSTICPROCEDURE. ALL OBDII APPLICATIONS HAVE THIS PID AVAILABLE. THERE ARE SOME OBDI VEHICLES THAT DO NOT HAVETHE BARO PID, FOR THESE VEHICLES OMIT THE BARO CHECK AND REFER ONLY TO STEPS 2, 3, AND 4 IN THE DIAGNOSTICPROCEDURE.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > All Other

Service Bulletins for General Module: > 98-23-10 > Nov > 98 > Engine - Lean Driveability Symptoms > Page 70

Ranger 2WD V6-3.0L VIN U (1998)

1.

Look at the BARO PID. Refer to the Barometric Pressure Reference Chart in this article. At sea level, BARO should read about 159 Hz (29.91 in.Hg). As a reference, Denver, Colorado at 1524 meters (5000 ft.) altitude should be about 144 Hz (24.88 in.Hg). Normal learned BARO variabilityis up to +/- 6 Hz (+/- 2 in. Hg.). If BARO indicates a higher altitude than you are not at (7 or more Hz lower than expected), you may have MAFcontamination. If available, Service Bay Diagnostic System (SBDS) has a Manifold Absolute Pressure (MAP) sensor that can be used as abarometric pressure reference. Use "MAP/BARO" test under "Powertrain," "Testers and Meters." Ignore the hookup screen. Connect GP2 to thereference MAP on the following screen.

NOTE

REMEMBER THAT MOST WEATHER SERVICES REPORT A LOCAL BAROMETRIC PRESSURE THAT HAS BEEN CORRECTED TOSEA LEVEL. THE BARO PID, ON THE OTHER HAND, REPORTS THE ACTUAL BAROMETRIC PRESSURE FOR THE ALTITUDE THEVEHICLE IS BEING OPERATED IN. LOCAL WEATHER CONDITIONS (HIGH AND LOW PRESSURE AREAS) WILL CHANGE THELOCAL BAROMETRIC PRESSURE BY SEVERAL INCHES OF MERCURY (+/- 3 Hz, +/- 1 in. Hg.).

NOTE

BARO IS UPDATED ONLY WHEN THE VEHICLE IS AT HIGH THROTTLE OPENINGS. THEREFORE, A VEHICLE WHICH IS DRIVENDOWN FROM A HIGHER ALTITUDE MAY NOT HAVE HAD AN OPPORTUNITY TO UPDATE THE BARO VALUE IN KAM. IF YOUARE NOT CONFIDENT THAT BARO HAS BEEN UPDATED, PERFORM THREE OR FOUR HEAVY, SUSTAINED ACCELERATIONS ATGREATER THAN HALF-THROTTLE TO ALLOW BARO TO UPDATE.

2.

On a fully warmed up engine, look at Long Term Fuel Trim at idle, in Neutral, A/C off, (LONGFT1 and/or LONGFT2 PIDs). If it is morenegative than -12%, the fuel system has learned lean corrections which may be due to the MAF sensor over-estimating air flow at idle. Note thatboth Banks 1 and 2 will exhibit negative corrections for 2-bank system. If only one bank of a 2-bank system has negative corrections, the MAFsensor is probably not contaminated.

3.

On a fully warmed up engine, look at MAF voltage at idle, in Neutral, A/C off (MAF V PID). If it's 30% greater than the nominal MAF V voltagelisted in the Powertrain Control/Emissions Diagnosis (PC/ED) Diagnostic Value Reference Charts for your vehicle, or greater than 1.1 volts as arough guide, the MAF sensor is over-estimating air flow at idle.

4.

If at least tow of the previous three steps are true, proceed to disconnect the MAF sensor connector. This puts the vehicle into Failure Mode andEffects Management (FMEM). In FMEM mode, air flow is inferred by using rpm and throttle position instead of reading the MAF sensor. (Inaddition, the BARO value is reset to a base/unlearned value.) If the lean driveability symptoms go away, the MAF sensor is probably contaminatedand should be replaced. If the lean driveability symptoms do not go away, go to the PC/ED Service Manual for the appropriate diagnostics.

NOTE

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > All Other

Service Bulletins for General Module: > 98-23-10 > Nov > 98 > Engine - Lean Driveability Symptoms > Page 76

Ranger 2WD V6-3.0L VIN U (1998)

DUE TO INCREASINGLY STRINGENT EMISSION/OBDII REQUIREMENTS, IT IS POSSIBLE FOR SOME VEHICLES WITH MAFSENSOR CONTAMINATION TO SET FUEL SYSTEM DTCs AND ILLUMINATE THE MIL WITH NO DRIVEABILITY CONCERNS.DISCONNECTING THE MAF ON THESE VEHICLES WILL, THEREFORE, PRODUCE NO IMPROVEMENTS IN DRIVEABILITY. INTHESE CASES, IF THE BARO, LONGFT1, LONGFT2, AND MAF V PIDs INDICATE THAT THE MAF IS CONTAMINATED, PROCEEDTO REPLACE THE MAF SENSOR.
After replacing the MAF sensor, disconnect the vehicle battery (5 minutes, minimum to reset KAM, or on newer vehicles, use the "KAM Reset" featureon the New Generation Star (NGS) Tester and verify that the lean driveability symptoms are gone.

OTHER APPLICABLE ARTICLES:: NONE WARRANTY STATUS: INFORMATION ONLY OASIS CODES: 206000, 610000, 610500, 610600, 610700, 611000, 611500, 612000, 612500, 614000, 614500, 614600, 698298

voltage at idle.

NOTE

THE FOLLOWING PROCEDURE MAY ALSO BE USED TO DIAGNOSE VEHICLES THAT DO NOT HAVE FUEL SYSTEM/HO2SSENSOR DTCS.
Symptoms

^ Lack of Power
^ Spark Knock/Detonation
^ Buck/Jerk
^ Hesitation/Surge on Acceleration
^ Malfunction Indicator Lamp (MIL) Illuminated -

DTCs P0171, P0172, P0174, P0175 may be stored in memory
OBDII DTCs
^ P0171, P0174 (Fuel system lean, Bank 1 or 2)
^ P0172, P0175, (Fuel system rich, Bank 1 or 2)
^ P1130, P1131, P1132, (HO2S11 lack of switching, Bank 1)
^ P1150, P1151, P1152, (HO2S21 lack of switching, Bank 2)
OBDI DTCs
^ 181, 189 (Fuel system lean, Bank 1 or 2)
^ 179, 188 (Fuel system rich, Bank 1 or 2)
^ 171, 172, 173 (HO2S11 lack of switching, Bank 1)
^ 175, 176, 177 (HO2S21 lack of switching, Bank 2)
^ 184, 185 (MAF higher/lower than expected)
^ 186, 187 (Injector pulse width higher/lower than expected)

:NOTE

DO NOT DISCONNECT THE BATTERY. IT WILL ERASE KEEP ALIVE MEMORY AND RESET LONG TERM FUEL TRIM AND BAROTO THEIR STARTING/BASE VALUES. THE BARO PARAMETER IDENTIFICATION DISPLAY (PID) IS USED FOR THIS DIAGNOSTICPROCEDURE. ALL OBDII APPLICATIONS HAVE THIS PID AVAILABLE. THERE ARE SOME OBDI VEHICLES THAT DO NOT HAVETHE BARO PID, FOR THESE VEHICLES OMIT THE BARO CHECK AND REFER ONLY TO STEPS 2, 3, AND 4 IN THE DIAGNOSTICPROCEDURE.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > All Other

Service Bulletins for General Module: > 98-23-10 > Nov > 98 > Engine - Lean Driveability Symptoms > Page 77

Ranger 2WD V6-3.0L VIN U (1998)

1.

Look at the BARO PID. Refer to the Barometric Pressure Reference Chart in this article. At sea level, BARO should read about 159 Hz (29.91 in.Hg). As a reference, Denver, Colorado at 1524 meters (5000 ft.) altitude should be about 144 Hz (24.88 in.Hg). Normal learned BARO variabilityis up to +/- 6 Hz (+/- 2 in. Hg.). If BARO indicates a higher altitude than you are not at (7 or more Hz lower than expected), you may have MAFcontamination. If available, Service Bay Diagnostic System (SBDS) has a Manifold Absolute Pressure (MAP) sensor that can be used as abarometric pressure reference. Use "MAP/BARO" test under "Powertrain," "Testers and Meters." Ignore the hookup screen. Connect GP2 to thereference MAP on the following screen.

NOTE

REMEMBER THAT MOST WEATHER SERVICES REPORT A LOCAL BAROMETRIC PRESSURE THAT HAS BEEN CORRECTED TOSEA LEVEL. THE BARO PID, ON THE OTHER HAND, REPORTS THE ACTUAL BAROMETRIC PRESSURE FOR THE ALTITUDE THEVEHICLE IS BEING OPERATED IN. LOCAL WEATHER CONDITIONS (HIGH AND LOW PRESSURE AREAS) WILL CHANGE THELOCAL BAROMETRIC PRESSURE BY SEVERAL INCHES OF MERCURY (+/- 3 Hz, +/- 1 in. Hg.).

NOTE

BARO IS UPDATED ONLY WHEN THE VEHICLE IS AT HIGH THROTTLE OPENINGS. THEREFORE, A VEHICLE WHICH IS DRIVENDOWN FROM A HIGHER ALTITUDE MAY NOT HAVE HAD AN OPPORTUNITY TO UPDATE THE BARO VALUE IN KAM. IF YOUARE NOT CONFIDENT THAT BARO HAS BEEN UPDATED, PERFORM THREE OR FOUR HEAVY, SUSTAINED ACCELERATIONS ATGREATER THAN HALF-THROTTLE TO ALLOW BARO TO UPDATE.

2.

On a fully warmed up engine, look at Long Term Fuel Trim at idle, in Neutral, A/C off, (LONGFT1 and/or LONGFT2 PIDs). If it is morenegative than -12%, the fuel system has learned lean corrections which may be due to the MAF sensor over-estimating air flow at idle. Note thatboth Banks 1 and 2 will exhibit negative corrections for 2-bank system. If only one bank of a 2-bank system has negative corrections, the MAFsensor is probably not contaminated.

3.

On a fully warmed up engine, look at MAF voltage at idle, in Neutral, A/C off (MAF V PID). If it's 30% greater than the nominal MAF V voltagelisted in the Powertrain Control/Emissions Diagnosis (PC/ED) Diagnostic Value Reference Charts for your vehicle, or greater than 1.1 volts as arough guide, the MAF sensor is over-estimating air flow at idle.

4.

If at least tow of the previous three steps are true, proceed to disconnect the MAF sensor connector. This puts the vehicle into Failure Mode andEffects Management (FMEM). In FMEM mode, air flow is inferred by using rpm and throttle position instead of reading the MAF sensor. (Inaddition, the BARO value is reset to a base/unlearned value.) If the lean driveability symptoms go away, the MAF sensor is probably contaminatedand should be replaced. If the lean driveability symptoms do not go away, go to the PC/ED Service Manual for the appropriate diagnostics.

NOTE

DUE TO INCREASINGLY STRINGENT EMISSION/OBDII REQUIREMENTS, IT IS POSSIBLE FOR SOME VEHICLES WITH MAFSENSOR CONTAMINATION TO SET FUEL SYSTEM DTCs AND ILLUMINATE THE MIL WITH NO DRIVEABILITY CONCERNS.DISCONNECTING THE MAF ON THESE VEHICLES WILL, THEREFORE, PRODUCE NO IMPROVEMENTS IN DRIVEABILITY. INTHESE CASES, IF THE BARO, LONGFT1, LONGFT2, AND MAF V PIDs INDICATE THAT THE MAF IS CONTAMINATED, PROCEEDTO REPLACE THE MAF SENSOR.
After replacing the MAF sensor, disconnect the vehicle battery (5 minutes, minimum to reset KAM, or on newer vehicles, use the "KAM Reset" featureon the New Generation Star (NGS) Tester and verify that the lean driveability symptoms are gone.

OTHER APPLICABLE ARTICLES:: NONE WARRANTY STATUS: INFORMATION ONLY OASIS CODES: 206000, 610000, 610500, 610600, 610700, 611000, 611500, 612000, 612500, 614000, 614500, 614600, 698298

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > Page 78

General Module: Specifications

GEM/CTM Screw .............................................................................................................................................................................. 1.6-2 N.m (9-18 Lb-In)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Technical Service Bulletins > Page 79

General Module: Locations

Behind Instrument Panel View

The Generic Electronic Module is located behind center of instrument panel.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and Instructions

General Module: Diagram Information and Instructions

How to Find and Use These Diagrams

Diagrams are presented in three main categories:

- Power Distribution Diagrams

- System Diagrams

- Grounds Diagrams

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and

Instructions > Page 82

Ranger 2WD V6-3.0L VIN U (1998)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and

Instructions > Page 83

Ranger 2WD V6-3.0L VIN U (1998)

Sample Power Distribution Diagram

Power Distribution Diagrams

Provide the circuit details of how the system diagrams are powered. The power distribution source is shown at the top of a diagram page. All wires,connectors, and splices are shown in the same manner that the current flows, ending at the component/system being powered near the bottom of adiagram page. Circuits that go from one diagram page to another will be marked with large arrow heads.
The power distribution diagrams can be found at Starting and Charging/Power and Ground Distribution.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and

Instructions > Page 84

Ranger 2WD V6-3.0L VIN U (1998)

Sample System Diagram

System Diagrams

Components that work together are shown together in a system/subsystem diagram or set of diagrams. The system feed (circuit breaker, fuse, etc.) isshown at the top of a diagram page. All wires, connectors, components, and splices are shown in the same manner that the current flows, ending at theground at the bottom of a diagram page. Circuits that go from one diagram page to another will be marked with large arrow heads.

Management, Radio/Stereo, etc.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and

Instructions > Page 85

Ranger 2WD V6-3.0L VIN U (1998)

Sample Grounds Diagram

Grounds Diagrams

Provide the circuit details of how the system diagrams are grounded. This information is useful for checking interconnections of the grounding circuitsof different systems. The components/systems being grounded are shown at the top of a diagram page. All wires, connectors, and splices are shown in thesame manner that the current flows, ending at the ground at the bottom of a diagram page. Circuits that go from one diagram page to another will bemarked with large arrow heads.
The grounds diagrams can be found at Starting and Charging/Power and Ground Distribution.

Symbol Identification

ELECTRICAL SYMBOLS

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and

Instructions > Page 86

Ranger 2WD V6-3.0L VIN U (1998)

Electrical Symbols

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and

Instructions > Page 87

Ranger 2WD V6-3.0L VIN U (1998)

Electrical Symbols

VACUUM SYMBOLS

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and

Instructions > Page 88

Ranger 2WD V6-3.0L VIN U (1998)

Vacuum Symbols

Wire Color Code Identification

BK

BL

BR

: Black: Blue: Brown: Dark BlueDB

DG
GY
GN

LB

LG

PK

O

P

R

T

V

W

: Dark Green: Gray: Green: Light Blue: Light Green: Pink: Orange: Purple: Red: Tan: Violet: White: YellowY

NOTE:

Whenever a wire is labeled with two colors, the first color listed is the basic color of the wire, and the second color listed is the stripe markingof the wire.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and Instructions > Page 89

General Module: Connector Views

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and

Instructions > Page 90

Ranger 2WD V6-3.0L VIN U (1998)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and Instructions > Page 91

General Module: Electrical Diagrams

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and

Instructions > Page 92

Ranger 2WD V6-3.0L VIN U (1998)

Generic Electronic Module (Part 1 Of 4)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and

Instructions > Page 93

Ranger 2WD V6-3.0L VIN U (1998)

Generic Electronic Module (Part 2 Of 4)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Diagram Information and

Instructions > Page 94

Ranger 2WD V6-3.0L VIN U (1998)

Generic Electronic Module (Part 3 Of 4)
Generic Electronic Module (Part 4 Of 4)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Page 95

General Module: Description and Operation

Multi-Function Control Modules

The remote anti-theft personality (RAP) module controls the perimeter anti-theft, the keyless entry, and computer operated locks systems. For furtherinformation on the perimeter anti-theft, refer to Antitheft and Alarm Systems. See: Accessories and Optional Equipment/Antitheft and Alarm SystemsFor further information on the keyless entry and computer operated locks, refer to Keyless Entry. See: Accessories and Optional Equipment/Antitheftand Alarm Systems/Keyless Entry

GEM/CTM diagnostics are compatible with New Generation STAR (NGS) Tester.NOTE:

The GEM/CTM incorporates the functions of several different modules into one and offers diagnostics to easily locate and repair concerns affectingthe subsystems that it controls.

The GEM/CTM constantly monitors the systems under its control and reports a concern in the form of a diagnostic trouble code (DTC). A DTC canbe retrieved with NGS Tester through the communication link.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Page 96

Ranger 2WD V6-3.0L VIN U (1998)

The generic electronic module (GEM) is equipped on four-wheel drive (control trac system) or two-wheel drive vehicles with power windows. Thecentral timer module (CTM) is equipped only on the two-wheel drive vehicles without power windows.

NGS Tester is a menu-driven tester that allows the user to run specific diagnostic tests. It can isolate faults in the GEM/CTM subsystems through asymptom-driven diagnostic procedure. Connecting NGS Tester to the GEM/CTM communication link will not alert the GEM/CTM. If the GEM/CTMis in sleep mode when the diagnostic connector is plugged in, the GEM/CTM must be activated. If the communication link cannot be established, itwill advise to turn the ignition to RUN.
The GEM/CTM control system has two modes of operation, the normal operating mode and the tester dependent diagnostics mode.

NOTE:

The GEM/CTM can only detect open circuit/short to ground (GND) faults when the GEM/CTM is not energizing a load, and short to batteryfaults when the GEM/CTM is attempting to energize a load.

The normal operation of the GEM/CTM can detect errors. An integral part of the normal GEM/CTM operation is the continuous diagnostic capability.Continuous diagnostics detects errors and changes the GEM/CTM control strategy. There is no warning light for the GEM/CTM; therefore, a DTCconcern will direct the technician to the GEM/CTM. Examples of faults that may be detected during normal operation include:
GEM/CTM continuous self-test (RAM, ROM, EEPROM, A/D checking).

Output driver monitoring (open circuit/short to GND, short to battery).
Illogical combinations of input signals.

Subsystems

The GEM/CTM controls the heated backlite and mirror timer. When the rear window defrost switch is pressed, a ten-minute timer is started and theGEM/CTM energizes a relay that provides battery voltage to the heated backlite (and the heated outside rear view mirrors, if equipped).

OFF ACC START

The GEM/CTM de-energizes the relay when either ten minutes have elapsed, the rear window defrost switch is pressed again, or the ignition switch isturned to or . The ten-minute timer is temporarily halted if the ignition switch is turned to , and resumes after the ignition switch isreturned to .RUN

The GEM/CTM controls five modes of operation for the front wiper: MIST, INTERVAL (speed-dependent GEM only), , and .LOW HIGH WASH

These modes are active only when the ignition switch is in the RUN or ACC position.

The GEM responds to the windshield wiper control commands by interpreting inputs from the steering column seven-position delay/wash andfour-position mode select switches. Except when the seven position switch is in interval 1, the speed dependent wipers will compensate for the extramoisture that accumulates on the windshield at higher speeds.
The GEM/CTM relay drivers control three external relays: wiper high/low speed relay, dynamic brake-run relay, and washer pump relay.

The GEM does not control the rear washer.NOTE:

The GEM responds to the rear wiper control commands by interpreting inputs from the rear wiper mode wash switch. There are two modes ofoperation for the rear wiper: .INTERVAL and LOW

The GEM relay drivers control two external relays: rear wiper up relay, and rear wiper down relay.

The GEM/CTM controls all audible chimes and warning lights. The GEM/CTM performs a prove out on all GEM/CTM controlled warning lightminiature bulbs (except the seat belt and door ajar) by turning on the miniature bulb for two seconds after the ignition switch is turned to RUN from .START

The exterior lamps are not part of the battery saver protection, and will remain on even if the GEM/CTM turns the interior lamps off.NOTE:

45 minutes

The GEM/CTM will keep power available for all interior lights including the dome lamp, map lamp, outside rear view mirror illumination lamp, doorlamps, glove box lamp (if equipped), ashtray lamp, key ring lights, cargo lamp, for after the ignition switch is turned off. The battery savertime is reset by receiving an illuminated entry request from the RAP module (if equipped), activating a door ajar switch, changing the ignition to , or moving the key to the or ACC position.START RUN

45minutes OFF OFF 45 minutes

The battery saver feature removes extended interior lamp power drains to the battery (10655). The GEM/CTM keeps power to these loads for after the ignition switch is moved to . After the ignition switch is moved to and have elapsed with no change of state onany wake-up inputs, the GEM/CTM will enter a sleep mode. During the sleep mode, the GEM/CTM maintains all of its outputs in a deactivated stateuntil a wake-up-command is received. For additional information, refer to Lighting and Horns. See: Lighting and Horns
A wake-up command is sent when:

- A change in door state from open to closed, or closed to open occurs.

- The key is inserted or removed.

-

The ignition switch is turned from to . OFF RUN

-

The ignition switch is turned from to . OFF ACCY

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Page 97

Ranger 2WD V6-3.0L VIN U (1998)

- A wake-up request is received from the remote anti-theft personality (RAP) module.

The GEM/CTM illuminates the interior courtesy lamps when any door is set ajar or is opened. The following are inputs used for controlling thecourtesy lamps:

- All door ajar switches (including liftgate).

- Illuminated entry request with RAP module.

- Two-step unlock door disarm switches.

All interior courtesy lamps are turned off when any of the following occurs:

- All the doors are closed and the illuminated entry feature is not active.

- The ignition switch is turned to RUN.

--

Vehicle speed is over . 8 km/h (5 mph)

- A power door lock command is received before the five seconds have elapsed for two-step unlock.

The GEM/CTM controls the interior lamps illuminated entry function with the interior lamp relay. The relay is activated by applying ground to therelay coil through C283-12, circuit 1008 (LG/O), and is deactivated by removing the ground.

The RAP module sends a signal to the GEM on the illuminated entry request circuit to indicate a request to turn the illuminated entry feature ON orOFF.

The GEM illuminates the interior lamps when an unlock signal is received from the RAP module. The illuminated entry feature will be canceled whenany of the following conditions are met:

- 25 seconds have elapsed since the illuminated entry feature was activated and the interior lamp control is not activated.

- The GEM receives a request from the RAP module (remote transmitter lock button pressed) and the courtesy lamp control is not activated.

-

The ignition is in the or position and the interior lamp control is not activated.RUN START

The illuminated entry inputs are:

- Door open warning lamp switch (grounded when the handle is lifted; an open circuit when the handle is released).

-

Ignition switch in the key-in, and position. ACCY RUN

- RAP illuminated entry request.
The GEM/CTM sleep mode outputs are:

- None (All circuits are deactivated during sleep mode).

If a change in any of the above inputs occur while the GEM/CTM is asleep, the GEM/CTM will wake up and monitor all of its inputs, and will havethe ability to activate any of its outputs.

The GEM module provides temporary power to the power windows, the rear wiper (for parking of the rear wiper off the liftgate glass), and themessage center for ten minutes after the ignition switch is moved from the RUN to OFF position. If, during this ten-minute period, either front door isopened, the delayed accessory relay will be de-energized.

The GEM controls the one-touch down window feature. When the power switch for the driver window control is held down (between 0.04 and 0.4second) and then released with the ignition switch in RUN OR ACC, the driver window will automatically move to its full down position.

Only the driver window has this feature. Holding the driver window switch down longer allows the operator to stop the window as soon as the switchis released. For additional power window information, refer to Windows and Glass. See: Windows and Glass

To activate the two-step unlock system the GEM requires that there must be two transitions of the unlock switch. After the GEM senses the firsttransition, it unlocks that door where the transition occurs and illuminates the courtesy lamps. There is a five-second window that begins from the firsttransition of the unlock switch. If within that window, a second unlock command is sensed by the GEM, the GEM will energize a relay to unlock allthe doors after the second transition of the unlock switch returns to the vertical position in the door lock cylinder.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Page 98

General Module: Service and Repair
REMOVAL

1. Disconnect the battery ground cable.

Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage may result.CAUTION:

NOTE: (CTM) (NGS)

The Central Timer Module must be reconfigured upon replacement. Refer to the New Generation STAR Tester helpscreen on the configuration card to program the Tire Size, Axle Ratio.

2. Remove the radio chassis.

3. Remove the center instrument panel finish panel.
1 Remove the screws.
2 Remove the center instrument panel finish panel.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > General Module > Component Information > Diagrams > Page 99

Ranger 2WD V6-3.0L VIN U (1998)

4. Remove the Generic Electronic Module /Central Timer Module .(GEM) (CTM)

1 Remove the screw.
2 Disconnect the four connectors from the GEM/CTM.
3 Remove the GEM/CTM.

INSTALLATION

1. To install, reverse the removal procedure.

NOTE:

When the battery is disconnected and reconnected, some abnormal drive symptoms may occur while the vehicle relearns its adaptivestrategy. The vehicle may need to be driven or more to relearn the strategy.16 km (10 mi)

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Relay > Component Information > Locations > All Lock Relay

Power Door Lock Relay: LocationsAll Lock Relay

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Relay > Component Information > Locations > All Lock Relay > Page 105

Ranger 2WD V6-3.0L VIN U (1998)

Behind Instrument Panel View

The All Lock Relay is located in Relay Box.