Starting System: Diagnosis Ford Edge I

Inspection and Verification

Note. The anti-theft system must be functioning correctly before a logical starting system diagnosis can be carried out. Address anti-theft system concerns before continuing.

1. Verify the customer concern by operating the starting system to duplicate the conditions.
2. Inspect to determine if any of the following mechanical or electrical concerns apply. VISUAL INSPECTION CHART Mechanical Electrical Starter motor Starter motor bolts Flexplate Battery Open fuse Battery junction box (BJB) fuse 41 (30A) Smart junction box (SJB) fuse 27 (20A) Damaged wiring harness Starter relay Anti-theft system 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 scan tool to the data link connector (DLC).
5. If the scan tool does not communicate with the VCM: check the VCM connection to the vehicle. check the scan tool connection to the VCM. refer to «MODULE COMMUNICATIONS NETWORK»(ref-292539) article, No Power To The Scan Tool, to diagnose no communication with the scan tool.
6. If the scan tool does not communicate with the vehicle: verify the ignition key is in the ON position. verify the scan tool operation with a known good vehicle. refer to «MODULE COMMUNICATIONS NETWORK»(ref-292539) article to diagnose no response from the PCM.
7. Carry out the network test. If the scan tool responds with no communication for one or more modules, refer to «MODULE COMMUNICATIONS NETWORK»(ref-292539) article. If the network test passes, retrieve and record continuous memory DTCs.
8. Clear the continuous DTCs and carry out the self-test diagnostics for the PCM.
9. If the DTCs retrieved are related to the concern, go to PCM DTC Chart or the Passive Anti-Theft System (PATS) DTC Chart. For all other DTCs, refer to «MULTIFUNCTION ELECTRONIC MODULES»(ref-292540) article.
10. If no DTCs related to the concern are retrieved, go to «SYMPTOM CHART»(ref-292565-S29932096702008080400000) .

PCM DTC CHART

PASSIVE ANTI-THEFT SYSTEM (PATS) DTC CHART

Symptom Chart

SYMPTOM CHART

Pinpoint Test A: The Engine Does Not Crank

Refer to appropriate SYSTEM WIRING DIAGRAM article for Starting System schematic and connector information.

Normal Operation

Under normal operation, constant power is supplied to the starter motor relay from the battery junction box (BJB) fuse 41 (30A). When the ignition switch is turned in the START position and held, with the vehicle in PARK or NEUTRAL, power flows to the starter motor relay through CDC35 (BU/WH). A ground is supplied through circuit CDC12 (YE) from the PCM causing the starter motor relay coil to energize and the relay contacts close. This allows power to be supplied from the starter motor relay contacts which then flows through circuit CDC25 (BN/GN) to the starter solenoid. The solenoid is grounded at the starter motor. Energizing the starter solenoid will engage the starter drive into the ring gear and closes the solenoid contacts allowing power directly from the battery through circuit SDC02 (RD) to the starter motor to start the engine.

This pinpoint test is intended to diagnose the following

1. Battery
2. Anti-theft system
3. Starter relay
4. Ignition switch
5. Circuitry
6. PCM
7. Start diode

PINPOINT TEST A: THE ENGINE DOES NOT CRANK

Scheme 3

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Scheme 13

1. A1 CHECK THE BATTERY Check the battery condition and charge. Refer to «BATTERY, MOUNTING AND CABLES»(ref-292545) article. Is the battery OK? YES : Go to A2 . NO : CHARGE or INSTALL a new battery as necessary. REFER to «BATTERY, MOUNTING AND CABLES»(ref-292545) article. TEST the system for normal operation.
2. A2 CHECK FOR PASSIVE ANTI-THEFT SYSTEM (PATS) DTCs NOTE: Passive anti-theft system (PATS) DTCs are the only DTCs of concern in this step. Only repair retrieved non-PATS DTCs if a customer concern is reported. Check for PATS DTCs. Were any PATS DTCs retrieved? YES : REFER to «ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS)»(ref-292557) article to diagnose the PATS DTCs. NO : Go to A3 .
3. A3 CHECK THE BATTERY GROUND CABLE Measure the voltage between the positive battery post and the battery ground cable connection at the engine. Is the voltage greater than 10 volts? YES : Go to A4 . NO : INSTALL a new battery ground cable. REFER to «BATTERY, MOUNTING AND CABLES»(ref-292545) article. TEST the system for normal operation.
4. A4 CHECK THE STARTER MOTOR GROUND Measure the voltage between the positive battery post and the starter motor case. Is the voltage greater than 10 volts? YES : Go to A5 . NO : CLEAN the starter motor mounting flange and make sure the starter motor is correctly mounted. TEST the system for normal operation.
5. A5 CHECK THE POWER SUPPLY TO THE STARTER MOTOR Measure the voltage between starter motor C197A, circuit SDC02 (RD) and ground. Is the voltage greater than 10 volts? YES : Go to A6 . NO : INSTALL a new positive battery cable. REFER to «BATTERY, MOUNTING AND CABLES»(ref-292545) article. TEST the system for normal operation.
6. A6 CHECK THE STARTER MOTOR B-PIN Connect one end of a fused (30A) jumper wire to starter motor solenoid C197A, circuit SDC02 (RD). Momentarily connect the other end of the jumper to starter motor C197B, circuit CDC25 (BN/GN). Did the starter motor engage and the engine crank? YES : Go to A7 . NO : INSTALL a new starter motor. REFER to «STARTER MOTOR»(ref-292565-S13718849582008080400000) . TEST the system for normal operation.
7. A7 CHECK STARTER MOTOR RELAY POWER CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. Disconnect: Starter Motor Relay Measure the voltage between battery junction box (BJB) starter motor relay pin 30, harness side and ground. Is the voltage greater than 10 volts? YES : Go to A8 . NO : REPAIR or REPLACE the BJB. TEST the system for normal operation.
8. A8 CHECK THE STARTER MOTOR RELAY Carry out the Starter Motor Relay Component Test. Refer to COMPONENT TESTING. Did the starter motor relay pass the component test? YES : Go to A9 . NO : INSTALL a new starter motor relay. TEST the system for normal operation.
9. A9 CHECK THE CIRCUIT TO THE STARTER MOTOR Key in OFF position. Disconnect: Starter Motor Solenoid C197B Measure the resistance between starter motor solenoid S-terminal C197B, circuit CDC25 (BN/GN), harness side and the BJB starter motor relay pin 87, circuit CDC25 (BN/GN), harness side. Is the resistance less than 5 ohms? YES : Go to A10 . NO : REPAIR circuit CDC25 (BN/GN). TEST the system for normal operation.
10. A10 CHECK CIRCUIT CDC35 (BU/WH) FOR VOLTAGE Connect: Starter Motor Solenoid C197B Connect: Starter Motor Relay Disconnect: Starter Diode Measure the voltage between BJB starter diode cell, circuit CDC35 (BU/WH) and ground with the ignition switch in the START position. Is the voltage greater than 10 volts? YES : Go to A13 . NO : Go to A11 .
11. A11 CHECK CIRCUIT SBP27 (BU/RD) FOR VOLTAGE Disconnect: Ignition Switch C250 Measure the voltage between ignition switch C250-4, circuit SBP27 (BU/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to A12 . NO : REPAIR circuit SBP27 (BU/RD). TEST the system for normal operation.
12. A12 CHECK THE IGNITION SWITCH Carry out the Ignition Switch Component Test. Refer to COMPONENT TESTING. Did the ignition switch pass the component test? YES : REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation. NO : INSTALL a new ignition switch. REFER to «STEERING COLUMN SWITCHES»(ref-292544) article. TEST the system for normal operation.
13. A13 CHECK THE STARTER DIODE Carry out a Starter Diode Test. Is the starter diode open or shorted? YES : INSTALL a new starter diode. TEST the system for normal operation. NO : Go to A14 .
14. A14 CHECK THE STARTER MOTOR RELAY ENABLE (STRT_RLY) PID Enter the following diagnostic mode on the diagnostic tool: PCM DataLogger/PID Monitor the PCM PID STRT_RLY with the ignition switch in the START position. Does the PID change from DISABLED to ENABLED? YES : Go to A17 . NO : Go to A15 .
15. A15 CHECK CIRCUIT CDC35 (BU/WH) BETWEEN THE BJB AND THE PCM Key in OFF position. Disconnect: Starter Relay Disconnect: PCM C175B Disconnect: Smart Junction Box (SJB) C2280B Measure the resistance between the BJB starter motor relay pin 85, circuit CDC35 (BU/WH), harness side and PCM C175b-35, circuit CDC35 (BU/WH), harness side. Is the resistance less than 5 ohms? YES : Go to A16 . NO : REPAIR circuit CDC35 (BU/WH). TEST the system for normal operation.
16. A16 CHECK CIRCUIT CDC35 (BU/WH) BETWEEN THE BJB AND THE SJB Measure the resistance between the BJB starter motor relay pin 85, circuit CDC35 (BU/WH), harness side and SJB C2280B-32, circuit CDC35 (BU/WH), harness side. Is the resistance less than 5 ohms? YES : INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-292567) article. TEST the system for normal operation. NO : REPAIR circuit CDC35 (BU/WH) for an open. TEST the system for normal operation.
17. A17 CHECK THE STARTER MOTOR CONTROL OUTPUT DETECTED (SMC_MON) PID Enter the following diagnostic mode on the diagnostic tool: PCM DataLogger/PID Monitor the PCM PID SMC_MON with the ignition switch in the START position. Does the PID change from OFF to ON? YES : REPAIR circuit CDC12 (YE). TEST the system for normal operation. NO : INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-292567) article. TEST the system for normal operation.

Pinpoint Test B: One-Touch Integrated Start (OTIS) Does Not Operate Correctly

Refer to appropriate SYSTEM WIRING DIAGRAM article for Starting System schematic and connector information.

Normal Operation

When the ignition switch is turned in the START position and released, the PCM receives a starter motor request (SMR) signal through circuit CDC35 (BU/WH). With the vehicle in PARK or NEUTRAL, power flows from the PCM to the starter motor relay through circuit CDC35 (BU/WH). A ground is supplied through circuit CDC12 (YE) from the PCM causing the starter motor relay coil to energize and the relay contacts close. This allows power from starter motor relay through circuit CDC25 (BN/GN) to the starter solenoid. The solenoid is grounded at the starter motor. Energizing the starter solenoid will engage the starter drive into the ring gear and closes the solenoid contacts allowing power directly from the battery through circuit SDC02 (RD) to the starter motor to start the engine. The customer is no longer in the loop after the initial crank request, the customer may release the key to the RUN/START position. The PCM will disengage the starter motor based on engine running (rpm threshold), a set crank time has been exceeded or the ignition switch has been turned to the OFF position.

This pinpoint test is intended to diagnose the following

1. Circuitry
2. PCM

PINPOINT TEST B: ONE-TOUCH INTEGRATED START (OTIS) DOES NOT OPERATE CORRECTLY

Scheme 14

1. B1 CHECK THE STATUS OF ONE-TOUCH INTEGRATED START (OTIS) (OTS_STAT) PID Enter the following diagnostic mode on the diagnostic tool: PCM DataLogger/PID Monitor the PCM PID OTS_STAT with the ignition switch in the RUN position. Is the OTIS PID enabled? YES : Go to B2 . NO : ENABLE OTIS. TEST the system for normal operation. If OTIS will not enable, INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-292567) article. TEST the system for normal operation.
2. B2 CHECK THE KEY POSITION FOR START INDICATED (START_KEY) PID Enter the following diagnostic mode on the diagnostic tool: PCM DataLogger/PID Monitor the PCM PID START_KEY with the ignition switch in the START position. Does the PID change from OFF to ON? YES : Go to B4 . NO : Go to B3 .
3. B3 CHECK CIRCUIT CDC35 (BU/WH) Disconnect: Start Diode Disconnect: PCM C175B Measure the resistance between the start diode cell, circuit CDC35 (BU/WH), harness side and PCM C175B-35, circuit CDC35 (BU/WH), harness side. Is the resistance less than 5 ohms? YES : INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-292567) article. TEST the system for normal operation. NO : REPAIR circuit CDC35 (BU/WH). TEST the system for normal operation.
4. B4 CHECK THE STARTER MOTOR RELAY ENABLE (STRT_RLY) PID Enter the following diagnostic mode on the diagnostic tool: PCM DataLogger/PID Monitor the PCM PID STRT_RLY with the ignition switch in the START position. Does the PID change from DISABLED to ENABLED? YES : Go to B6 . NO : Go to B5 .
5. B5 CHECK CIRCUIT CDC35 (BU/WH) BETWEEN THE BJB AND THE PCM Key in OFF position. Disconnect: PCM C175B Disconnect: SJB C2280B Measure the resistance between the BJB starter motor relay pin 85, circuit CDC35 (BU/WH), harness side and PCM C175b-35, circuit CDC35 (BU/WH), harness side. Is the resistance less than 5 ohms? YES : INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-292567) article. TEST the system for normal operation. NO : REPAIR circuit CDC35 (BU/WH). TEST the system for normal operation.
6. B6 CHECK THE STARTER MOTOR CONTROL OUTPUT DETECTED (SMC_MON) PID Enter the following diagnostic mode on the diagnostic tool: PCM DataLogger/PID Monitor the PCM PID SMC_MON with the ignition switch in the START position. Does the PID change from OFF to ON? YES : REPAIR circuit CDC12 (YE). TEST the system for normal operation. NO : INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-292567) article. TEST the system for normal operation.

Pinpoint Test C: Unusual Starter Noise

This pinpoint test is intended to diagnose the following

1. Starter motor
2. Ring gear

PINPOINT TEST C: UNUSUAL STARTER NOISE

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1. C1 CHECK THE STARTER MOUNTING Inspect the starter mounting bolts for looseness. Is the starter motor mounted correctly? YES : Go to C2 . NO : INSTALL the starter motor correctly. REFER to «STARTER MOTOR»(ref-292565-S13718849582008080400000) . TEST the system for normal operation.
2. C2 CHECK FOR ENGINE NOISE Key in OFF position. Connect a remote starter switch between the starter solenoid B- and S-terminals. Engage the starter motor and verify the noise is due to the starter operation. Is the noise due to the starter motor engagement? YES : Go to C3 . NO : REFER to «ENGINE SYSTEM - GENERAL INFORMATION»(ref-292524) article to continue diagnosis.
3. C3 CHECK FOR UNUSUAL WEAR Remove the starter motor. Inspect the ring gear for damaged or worn teeth. Refer to «ENGINE - 3.5L»(ref-292564) article. Is the noise due to ring gear tooth damage? YES : INSTALL a new flexplate ring gear. REFER to «ENGINE - 3.5L»(ref-292564) article. EXAMINE the starter pinion teeth. If damaged, INSTALL a new starter motor. REFER to «Starter Motor»(ref-292565-S13718849582008080400000) . TEST the system for normal operation. NO : INSTALL a new starter motor. REFER to «STARTER MOTOR»(ref-292565-S13718849582008080400000) . TEST the system for normal operation.