Ford ST1137-A, ST2173-A, ST2332-A user guide

303-06-1 303-06-1Starting System

DIAGNOSIS AND TESTING

Starting System

Refer to Wiring Diagrams Cell 20, Starting System for schematic and connector information.

Special Tool(s)

73 Digital Multimeter 105-R0051 or equivalent

SABRE Premium Battery and Electrical System Tester 010-00730 or equivalent

Worldwide Diagnostic System (WDS) Vehicle Communication Module (VCM) with appropriate adapters, or equivalent diagnostic tool

Inspection and Verification

WARNING: When servicing the starter motor or carrying out other underhood work in the vicinity of the starter motor, be aware that the heavy gauge battery input lead at the starter solenoid is ‘‘electrically hot’’ at all times. A protective cap or boot is provided over the terminal of this lead and must be installed after servicing. Failure to follow these instructions may result in personal injury.

WARNING: When working in the area of the starter motor, be careful to avoid touching hot exhaust components. Failure to follow these instructions may result in personal injury.

NOTE: When working on the starter system, make

sure the anti-theft system is deactivated, if equipped.

1. Verify the customer concern by operating the

starting system.

2. Visually inspect for obvious signs of

mechanical and electrical damage. Refer to the following chart:

Visual Inspection Chart

Principles of Operation

The starting system is electronically controlled by the passive anti-theft system (PATS). The PATS recognizes the correct electronically coded ignition key and signals the instrument cluster to provide a ground for the starter relay. The energized relay provides voltage to the starter solenoid with the key in the START position, thereby allowing the starter motor to activate.

Mechanical Electrical

• Starter motor • Battery

• Brackets • Smart junction box

(SJB) fuse: — 21 (10A)

• Bussed electrical center

(BEC) fuse: — 3 (30A)

• Anti-theft system

• Damaged wiring harness

• Loose or corroded

connections

3. If an obvious cause for an observed or reported

concern is found, correct the cause (if possible) before proceeding to the next step.

4. If the cause is not visually evident, connect the

diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:

• check that the program card is correctly

installed.

• check the connections to the vehicle.

• check the ignition switch position.

Last updated: 12/8/2004

2005 Mustang, 12/2004

303-06-2 303-06-2Starting System

DIAGNOSIS AND TESTING (Continued)

5. If the diagnostic tool still does not communicate • System passed, retrieve and record the

with the vehicle, refer to the diagnostic tool continuous diagnostic trouble codes (DTCs), operating manual. erase the continuous DTCs and carry out the

6. Carry out the diagnostic tool data link test. If the diagnostic tool responds with: 7. If the DTCs retrieved are related to the concern,

• [appropriate communication networks, such

as SCP, ISO, UBP, CAN] circuit fault; all electronic control units no response/not 8. If no DTCs related to the concern are retrieved, equipped, refer to Section 418-00. GO to Symptom Chart.

• No response/not equipped for generic

electronic module (GEM), refer to Section 419-10.

Passive Anti-Theft System (PATS) — Diagnostic Trouble Code (DTC) Index

DTC Description Source Action

B1213 Anti-Theft Number Of Powertrain Control Module REFER to Section

Programmed Keys Is (PCM) 419-01B.

Below Minimum

B1342 ECU is Defective PCM CLEAR the DTCs.

B1600 Passive Anti-Theft System PCM REFER to Section

(PATS) Key Transponder 419-01B.

Is Not Received —

Damaged Key Or

Non-PATS Key

B1601 PATS Received Incorrect PCM REFER to Section

Key-Code From Key 419-01B.

Transponder

(Unprogrammed PATS

Key)

B1602 or B2431 PATS Received Invalid PCM REFER to Section

Format Of Key-Code From 419-01B.

Key Transponder (Partial

Key Read)

B1681 PATS Transceiver Module PCM REFER to Section

Signal Is Not Received 419-01B.

(Damaged, Not Connected

Or Damaged Wiring)

B2103 Internal Transceiver PCM REFER to Section

Antenna Damaged 419-01B.

P1260 PCM Disabled — Vehicle PCM REPAIR the PCM. REFER

Disabled to the Powertrain

self-test diagnostics for the GEM.

go to the Generic Electronic Module (GEM) Diagnostic Trouble Code (DTC) Index.

REPEAT the self-test. If

DTC B1342 is retrieved

again, INSTALL a PCM.

REFER to Section 303-14.

CLEAR the DTCs.

REPEAT the self-test.

Control/Emissions

Diagnosis (PC/ED) manual.

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303-06-3 303-06-3Starting System

DIAGNOSIS AND TESTING (Continued) Symptom Chart

Symptom Chart

Condition Possible Sources Action

• The engine does not crank • Battery • GO to Pinpoint Test A. and the relay does not click • Fuse

• Starter relay

• Ignition switch

• Digital transmission range

(TR) sensor (automatic transmission only)

• Clutch pedal position (CPP)

switch (manual transmission only)

• Circuit

• The engine does not crank • Fuse • GO to Pinpoint Test B. and the relay does click • Battery

• Starter motor/solenoid

• Ignition switch

• Circuit

• The engine cranks slowly • Battery • GO to Pinpoint Test C.

• Starter motor/solenoid

• Circuit

• Unusual starter noise • Starter mounting • GO to Pinpoint Test D.

• Flexplate or flywheel

• Starter motor

• The starter spins but the • Starter motor • INSPECT the starter motor

engine does not crank • Damaged flexplate or mounting and engagement.

flywheel ring gear teeth INSTALL a new starter

motor. REFER to Starter Motor — 4.0L SOHC or Starter Motor — 4.6L (3V) in this section.

• INSPECT the flexplate or

flywheel for damaged, missing or worn teeth. REPAIR as required.

Pinpoint Tests

Pinpoint Test A: The Engine Does Not Crank And The Relay Does Not Click

Normal Operation

In normal operation, voltage from the bussed electrical center (BEC) is supplied to the ignition switch through circuit 1050 (LG/PK). When the ignition switch is placed in the START position, voltage is supplied through circuit 1522 (DG) to the smart junction box (SJB).

For automatic transmission equipped vehicles, voltage is supplied from the SJB to the digital transmission range (TR) sensor through circuit 32 (RD/LB). In PARK or NEUTRAL, voltage is supplied from the TR sensor through circuit 33 (WH/PK) to the starter relay coil located in the BEC. The starter relay coil is supplied ground from the PCM through circuit 1419 (LG/YE).

For manual transmission equipped vehicles, voltage from the SJB is supplied to the clutch pedal position switch (CPP) through circuit 32 (RD/LB). When the clutch pedal is depressed, voltage is supplied from the CPP to the starter relay coil located in the BEC through circuit 32 (RD/LB). The starter relay coil is supplied ground from the PCM through circuit 1419 (LG/YE).

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303-06-4 303-06-4Starting System

DIAGNOSIS AND TESTING (Continued)

When the starter relay is energized, voltage supplied to the relay switch is sent to the starter motor solenoid through circuit 113 (YE/LB). Battery voltage is supplied to the starter motor through

Possible Causes

• Fuse(s)

• An open in battery voltage feed BEC, 2037 (RD)

circuit 2037 (RD) at all times.

• Starter motor relay

• Starter

PINPOINT TEST A: THE ENGINE DOES NOT CRANK AND THE RELAY DOES NOT CLICK

Test Step Result / Action to Take

A1 CHECK THE BATTERY

• Check the battery condition and charge if necessary. Refer to Section 414-01. GO to A2.

• Is the battery OK?

A2 CHECK FOR PATS DTCS

• NOTE: The PATS DTCs are the only DTCs of concern in this step. Only repair retrieved non-PATS DTCs if a customer GO to Section 419-01B to diagnose the concern is reported. PATS DTCs.

Check for PATS DTCs.

• Were any PATS DTCs retrieved?

A3 CHECK CIRCUIT 33 (WH/PK) (CIRCUIT 32 [RD/LB] MANUAL

TRANSMISSION ONLY) FOR VOLTAGE

• Disconnect: Starter Motor Relay.

• Key in START position.

• If equipped, fully depress the clutch pedal.

or 113 (YE/LB)

Yes No

CHARGE or INSTALL a new battery as necessary. REFER to Section 414-01. TEST the system for normal operation.

Yes

GO to A3.

(Continued)

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303-06-5 303-06-5Starting System

DIAGNOSIS AND TESTING (Continued)

PINPOINT TEST A: THE ENGINE DOES NOT CRANK AND THE RELAY DOES NOT CLICK (Continued)

Test Step Result / Action to Take

A3 CHECK CIRCUIT 33 (WH/PK) (CIRCUIT 32 [RD/LB] MANUAL

TRANSMISSION ONLY) FOR VOLTAGE (Continued)

• Measure the voltage between starter motor relay C1017-85, circuit 33 (WH/PK) (circuit 32 [RD/LB] manual transmission only) and ground while holding the key in the START position and with the clutch pedal, if equipped, fully depressed.

• Is the voltage greater than 10 volts? to A7.

A4 CHECK CIRCUIT 32 (RD/LB) FOR VOLTAGE AT THE DIGITAL

TR SENSOR (AUTOMATIC TRANSMISSION ONLY)

• Key in OFF position.

• Disconnect: Digital TR Sensor C167.

• Key in START position.

Yes

GO to A12.

Vehicles equipped with an automatic transmission, GO to A4. Vehicles equipped with a manual transmission, GO

(Continued)

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303-06-6 303-06-6Starting System

DIAGNOSIS AND TESTING (Continued)

PINPOINT TEST A: THE ENGINE DOES NOT CRANK AND THE RELAY DOES NOT CLICK (Continued)

Test Step Result / Action to Take

A4 CHECK CIRCUIT 32 (RD/LB) FOR VOLTAGE AT THE DIGITAL

TR SENSOR (AUTOMATIC TRANSMISSION ONLY) (Continued)

• Measure the voltage between digital TR sensor C167-10, circuit 32 (RD/LB) and ground while holding the key in the START position.

Yes

GO to A5.

• Is the voltage greater than 10 volts? GO to A8.

A5 CHECK CIRCUIT 33 (WH/PK) FOR AN OPEN

• Key in OFF position.

• Measure the resistance between digital TR sensor C167-12, circuit 33 (WH/PK) and starter motor relay C1017-85, circuit 33 (WH/PK).

Yes

GO to A6.

REPAIR circuit 33 (WH/PK). TEST the

• Is the resistance less than 5 ohms? system for normal operation.

2005 Mustang, 12/2004

(Continued)

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