Ford F-150 1998 Workshop Manual

ford :: Ford Truck F 150 4WD Pickup V8-4.6L
SOHC VIN W (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 DP1. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DP - Vehicle SpeedSensor (VSS)

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

Transfer Case

ESOF - Electronic Shift on the Fly

> 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

F 150 4WD Pickup V8-4.6L SOHC VIN W (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 ) > Page 10

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

B1432 - P1820 Electronic Shift on the Fly (ESOF)

MSOF - Mechanical Shift on the Fly

B1450 - P1828 Mechanical Shift on the Fly (MSOF)

For complete Transfer Case diagnostic information, See: Transmission and Drivetrain/Transfer Case/Testing and Inspection

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1800-P18ZZ > P1800 - P1804, ( P1801 P1802 P1803 1800 1801 1802 1803 1804 ) > System Information > System Diagnosis

P1800 - P1804: Testing and Inspection

For diagnosis of refer to the system experiencing the problem.P1804

Transfer Case

ESOF - Electronic Shift on the Fly

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1800-P18ZZ > P1800 - P1804, ( P1801 P1802 P1803 1800 1801 1802 1803 1804 ) > System Information

> System Diagnosis > Page 15

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

B1432 - P1820 Electronic Shift on the Fly (ESOF)

MSOF - Mechanical Shift on the Fly

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1800-P18ZZ > P1800 - P1804, ( P1801 P1802 P1803 1800 1801 1802 1803 1804 ) > System Information

> System Diagnosis > Page 16

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

B1450 - P1828 Mechanical Shift on the Fly (MSOF)

For complete Transfer Case diagnostic information, See: Transmission and Drivetrain/Transfer Case/Testing and Inspection

Instrument Panel

For complete Instrument Panel diagnostic information, See: Instrument Panel, Gauges and Warning Indicators/Instrument Cluster/Testing andInspection

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1800-P18ZZ > P1805 - P1809, ( P1806 P1807 P1808 1805 1806 1807 1808 1809 ) > System Information > System Diagnosis > P1806

P1805 - P1809: Testing and InspectionP1806

For diagnosis of refer to the system experiencing the problem.P1806

Transfer Case

ESOF - Electronic Shift on the Fly

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1800-P18ZZ > P1805 - P1809, ( P1806 P1807 P1808 1805 1806 1807 1808 1809 ) > System Information

> System Diagnosis > P1806 > Page 21

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

B1432 - P1820 Electronic Shift on the Fly (ESOF)

MSOF - Mechanical Shift on the Fly

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1800-P18ZZ > P1805 - P1809, ( P1806 P1807 P1808 1805 1806 1807 1808 1809 ) > System Information

> System Diagnosis > P1806 > Page 22

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

B1450 - P1828 Mechanical Shift on the Fly (MSOF)

For complete Transfer Case diagnostic information, See: Transmission and Drivetrain/Transfer Case/Testing and Inspection

Instrument Panel

For complete Instrument Panel diagnostic information, See: Instrument Panel, Gauges and Warning Indicators/Instrument Cluster/Testing andInspection

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1800-P18ZZ > P1805 - P1809, ( P1806 P1807 P1808 1805 1806 1807 1808 1809 ) > System Information > System Diagnosis > P1806 > Page 23

P1805 - P1809: Testing and InspectionP1808

For diagnosis of refer to the system experiencing the problem.P1808

Transfer Case

ESOF - Electronic Shift on the Fly

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1800-P18ZZ > P1805 - P1809, ( P1806 P1807 P1808 1805 1806 1807 1808 1809 ) > System Information

> System Diagnosis > P1806 > Page 24

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

B1432 - P1820 Electronic Shift on the Fly (ESOF)

MSOF - Mechanical Shift on the Fly

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1800-P18ZZ > P1805 - P1809, ( P1806 P1807 P1808 1805 1806 1807 1808 1809 ) > System Information

> System Diagnosis > P1806 > Page 25

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

B1450 - P1828 Mechanical Shift on the Fly (MSOF)

For complete Transfer Case diagnostic information, See: Transmission and Drivetrain/Transfer Case/Testing and Inspection

Instrument Panel

For complete Instrument Panel diagnostic information, See: Instrument Panel, Gauges and Warning Indicators/Instrument Cluster/Testing andInspection

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1800-P18ZZ > P1810 - P1814, ( P1811 P1812 P1813 1810 1811 1812 1813 1814 ) > System Information > System Diagnosis > P1810

P1810 - P1814: Testing and InspectionP1810

For diagnosis of refer to the system experiencing the problem.P1810

Transfer Case

ESOF - Electronic Shift on the Fly

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1800-P18ZZ > P1810 - P1814, ( P1811 P1812 P1813 1810 1811 1812 1813 1814 ) > System Information

> System Diagnosis > P1810 > Page 30

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

B1432 - P1820 Electronic Shift on the Fly (ESOF)

MSOF - Mechanical Shift on the Fly

> A L L Diagnostic Trouble Codes ( DTC ) > Codes by Number > P1800-P18ZZ > P1810 - P1814, ( P1811 P1812 P1813 1810 1811 1812 1813 1814 ) > System Information

> System Diagnosis > P1810 > Page 31

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

B1450 - P1828 Mechanical Shift on the Fly (MSOF)

For complete Transfer Case diagnostic information, See: Transmission and Drivetrain/Transfer Case/Testing and Inspection

Instrument Panel

For complete Instrument Panel diagnostic information, See: Instrument Panel, Gauges and Warning Indicators/Instrument Cluster/Testing andInspection

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

Accessory Delay Relay: Locations

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

Locations > Page 38

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

Instrument Panel View

Junction Box Fuse/Relay Panel (Part 1 Of 2)

The Accessory Delay Relay is located in the junction box fuse/relay panel.

> 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 Nuts ..................................................................................................................................... 7-8.1 Nm (62-72 in lb)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Specifications > Page 42

Alarm Module: Locations

Body View

The Remote Anti-Theft Personality Module is located behind left side of the instrument panel.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Specifications > Page 43

Alarm Module: Diagrams

Remote Anti-Theft Personality Module (C257)

Remote Anti-Theft Personality Module (C256)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Specifications > Page 44

Alarm Module: Description and Operation

The RAP module controls the anti-theft system and the keyless entry system. The RAP module communicates with the GEM to request that the interiorlights be turned ON/OFF with use of the keyless entry remote transmitter, and the GEM communicates with the RAP module to inform when the door isopened. REFER to Module Communications Network for inter-module communication.

(RAP)

The ignition lock anti-theft switch detects if the ignition key cylinder is broken or "slam pulled" during a theft. The ignition lock anti-theft switch isalways monitored by the Remote Anti-theft Personality module. This allows the alarm system to be triggered if the ignition lock anti-theft switchdetects tampering of the ignition key cylinder (even in the event that the alarm is not active at the time).

(GEM)

The door open warning lamp switch communicates with the RAP module through the Generic Electronic Module . This input to the RAP modulewill cause the anti-theft alarm to be sounded if the anti-theft alarm was armed.

The door disarm switches are attached to both the LH and RH lock cylinder. The door disarm switch must be triggered before the mechanical lockunlocks. This prevents the anti-theft alarm from activating when it should have been disarmed.

In addition to the perimeter alarm that uses the door open warning lamp switch, the RAP module also uses the ignition lock anti-theft switch and theautolock/relock feature to prevent theft of the vehicle. For a full description of the autolock/relock system, REFER to the Keyless Entry system.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm Module, (Vehicle Antitheft) > Component Information > Specifications > Page 45

Alarm Module: Service and Repair
REMOVAL

1. Disconnect the battery ground cable.

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

2. Remove the LH front door scuff plate.

3. Remove the LH cowl side trim panel.

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

46

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

4. Disconnect the two Remote Anti-theft Personality module electrical connectors.(RAP)

1 Disconnect C257.
2 Disconnect C256.

If C256 is disconnected first, an inadvertent IGNTAM alarm event (AL_EVT) will be stored and the alarm will sound. The alarm must beNOTE:

disarmed by the remote unlock button or a key in the door lock cylinder to UNLOCK. To avoid this condition, disconnect (1) C257 before (2)C256 and reconnect (2) C256 before (1) C257.

5. Remove the RAP module nuts and the RAP module.

INSTALLATION

1. To install, reverse the removal procedure.

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

^ To avoid inadvertent alarm activation, reconnect C256 first.

^NOTE:

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component Information > Specifications

Multifunction Electronic Control Module: Specifications

GEM/CTM Screws ........................................................................................................................................................................... 0.9-1.3 Nm (8-12 in lb)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component Information > Specifications > Page 50

Multifunction Electronic Control Module: Locations

Instrument Panel View

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Specifications > Page 51

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

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

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component Information > Diagrams > Diagram Information and

Instructions

Multifunction Electronic Control 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 > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 54

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 55

F 150 4WD Pickup V8-4.6L SOHC VIN W (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 > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 56

F 150 4WD Pickup V8-4.6L SOHC VIN W (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 > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 57

F 150 4WD Pickup V8-4.6L SOHC VIN W (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 > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 58

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

Electrical Symbols

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 59

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

Electrical Symbols

VACUUM SYMBOLS

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 60

F 150 4WD Pickup V8-4.6L SOHC VIN W (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 marking ofthe wire.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component Information > Diagrams > Diagram Information and

Instructions > Page 61

Multifunction Electronic Control Module: Connector Views

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 62

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

Generic Electronic Module/Central Timer Module

Generic Electronic Module (C267)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 63

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

Generic Electronic Module (C240)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 64

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

Generic Electronic Module (C241)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component Information > Diagrams > Diagram Information and

Instructions > Page 65

Multifunction Electronic Control Module: Electrical Diagrams

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 66

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

Generic Electronic Module (Part 1 Of 4)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 67

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

Generic Electronic Module (Part 2 Of 4)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Diagram Information and Instructions > Page 68

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

Generic Electronic Module

Generic Electronic Module (Part 4 Of 4)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component Information > Diagrams > Page 69

Multifunction Electronic Control Module: Description and Operation

(CTMs)

Central Timer Modules are equipped on two-wheel drive vehicles without power windows. All other vehicles have a Generic Electronic Module.(GEM)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Page 70

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

NOTE: (NGS)

CTM diagnostics are not compatible with the New Generation STAR Tester; instead, the diagnostics are internal to the module. Thediagnostic mode is entered by shorting two pins of the diagnostic connector together.
The GEM inputs and outputs are designed to withstand continuous exposure to a short circuit to ground or battery voltage without being damaged.

GEM Diagnostics

(SBDS)

The GEM diagnostics are accessible with the New Generation Star Tester and the Service Bay Diagnostic System . The GEM constantlymonitors its subsystems for concerns. If a concern is found in one of the subsystems, the GEM will record the concern in the form of a DiagnosticTrouble Code .(DTC)

There are three areas of diagnostic information useful when diagnosing the GEM.

^ DTCs A record of past or present system problems.

^ PIDs - The present state of an input or output.
^ Active Commands Gives the ability to turn on GEM outputs without activating the inputs normally associated with the function.

Ignition Switch Positions

The position of the ignition switch is very important to proper GEM operation. Often times, erratic or unexpected operation can be traced to problems onthese GEM inputs. The following is a brief description of five ignition switch positions.

When the ignition switch is in the RUN position, battery voltage should be present at the GEM/CTM RUN and RUN/ACC input terminals When theignition switch is in the ACC position, battery voltage should be present at the GEM/CTM RUN/ACC input terminal only.
When the ignition switch is in the START position, battery voltage should be present at the GEM/CTM start/clutch depressed input.

The GEM module does not have an OFF or LOCK Switch State input. The GEM will assume the OFF or LOCK position when there are no RUN, ACC,or START signals present.

GEM Features and Functions

GEM Feature Matrix

The GEM controls the following features:

^ Wipers/washers.
^ Warning chimes.
^ Battery saver.
^ Illuminated entry and courtesy lamps.
^ Driver power window
^ Accessory delay.
^ 4-wheel drive

Wiper/Washer Control and Interval Timer

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Page 71

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

There are four modes of operation for the wipers: interval (standard CTM and speed-dependent GEM), LOW, HI, and wash. These modes are onlyactive with the ignition switch in the RUN or ACC position. Speed dependent wipers compensate for the extra moisture that accumulates on thewindshield at higher speeds. At higher speeds, the speed dependent feature shortens the delay between wipers when using the variable interval wiperfeature. Delays will automatically adjust at speeds between .16 and 105 km/h (10 and 65 mph)

Chime Warning

There are four warning chimes and lamps that are controlled by the GEM and CTM: headlamps operating without the ignition on (chime only), door ajar(chime and lamp), key in the ignition (chime only), and driver seat belt warning (chime and lamp).

Battery Saver

40 minutes

The battery saver feature removes extended interior lamp power drains from the battery. The GEM and CTM will keep power available for all interiorlights and hood lamp circuits for after the ignition switch is turned OFF. The battery saver timer is reset by lifting a door handle (GEM only),activating a door ajar switch, unlocking door with the keyless entry remote transmitter, or changing the ignition to RUN or ACC position. If asleep, theGEM and CTM will wake up when one of the following occurs:

^ Any door becomes ajar or is closed.
^ The key is inserted or removed.
^ The ignition switch is turned to ACC or RUN.
^ The doors are unlocked with the keyless entry remote transmitter.

Courtesy Lamps/Illuminated Entry

The GEM/CTM illuminates the interior courtesy lamps when any door is ajar. The GEM also receives a signal from the Remote Anti-theft Personality module for keyless entry illumination. All interior courtesy lamps are turned off when any of the following occur:(RAP)

^

have elapsed since the illuminated entry feature was activated.Twenty-five seconds

^ The ignition switch is turned to RUN.
^

25 km/h (15 mph) 16 km/h (10 mph)

Vehicle speed is over (a new ajar signal will turn on courtesy lamps only if the vehicle speed is less than - GEM only).

Delayed Accessory (GEM only)

ten minutes

The delayed accessory feature provides power to the power windows for after the ignition switch is moved from the RUN to the OFFposition. If during this period either door is opened, the delayed accessory relay will be de-energized.ten-minute

One-Touch Down Window (GEM only)

The power switch for the driver window control has two detents for the down window control. With the ignition switch in RUN or ACC, pressing thefirst detent (normal mode) allows manual down window control; pressing the switch farther to the second detent (auto) will cause the driver window toautomatically move to the full down position. Pressing either the up or down window switch will cancel an auto mode operation in progress.

Transfer Case (4-Wheel Drive - GEM Only)

Two types of 4-wheel drive systems are offered: the Mechanical Shift-On-the-Fly and the Electronic Shift-On-the-Fly .(MSOF) (ESOF)

RAP-Controlled Functions

The RAP module controls the door locks through three external relays located under the instrument panel relay cover:

^ Driver unlock relay.
^ All unlock relay.
^ All lock relay.

The RAP module receives input from the following components for electronic door lock system operation:

^ Keyless entry remote transmitters.
^ Door ajar output from the GEM.
^ Door unlock switches (LH/RH).
^

Brake Pedal Position switch.(BPP)

^

Digital Transmission Range sensor.(DTR)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component Information > Diagrams > Page 72

Multifunction Electronic Control Module: Service and Repair

GENERIC ELECTRONIC MODULE

REMOVAL

1. Disconnect the battery ground cable.

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

2. Remove the cover from the instrument panel fuse junction panel.

3. Remove the lower instrument panel steering column cover.
1 Remove the lower instrument panel steering column cover bolts.
2 Remove the lower instrument panel steering column cover.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Page 73

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

4. Remove the (A) bulkhead electrical connectors from the (B) instrument panel fuse junction panel.

5 Remove the (A) instrument panel fuse junction panel bolts and remove the (B) interior fuse junction panel nuts.

6. Disconnect the (A) Generic Electronic Module/Central Timer Module electrical connectors from the (B) GEM/CTM.(GEM/CTM)

7. Remove the GEM/CTM screws and the GEM/CTM.

INSTALLATION

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Multifunction Electronic Control Module <--> [General Module] > Component

Information > Diagrams > Page 74

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

1. To install, reverse the removal procedure.
^ Check for proper operation.

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 80

F 150 4WD Pickup V8-4.6L SOHC VIN W (1998)

Body View

Lock Relays

The All Lock Relay is located in the lock relays, behind the right hand side of the instrument panel.