Inspection and Verification
| WARNING | Always disconnect the battery ground cable at the battery before disconnecting the starter motor battery terminal lead. If a tool is shorted at the starter motor battery terminal, the tool can quickly heat enough to cause a skin burn. Failure to follow this instruction may result in serious personal injury. |
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. Refer to ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) .
- Verify the customer concern by operating the starting system to duplicate the conditions.
- Remove the accessory drive belt. Refer to «ACCESSORY DRIVE»(ref-372765) . Verify the crankshaft and each of the components driven by the accessory drive belt rotate and are not seized or damaged.
- Inspect to determine if any of the following mechanical or electrical concerns apply. Visual Inspection Chart VISUAL INSPECTION CHART Mechanical Electrical Starter motor Starter motor bolts Flexplate Battery Open fuse Battery Junction Box (BJB) fuse 10 (30A) Smart Junction Box (SJB) fuse 27 (20A) Damaged wiring harness Starter relay Anti-theft system Loose or corroded connections
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- NOTE: Make sure to use the latest scan tool software release. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
- NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM . 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-372772) , No Power To The Scan Tool, to diagnose no power to the scan tool.
- 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-372772) to diagnose no response from the PCM.
- Carry out the network test. If the scan tool responds with no communication for one or more modules, Refer to «MODULE COMMUNICATIONS NETWORK»(ref-372772) . If the network test passes, retrieve and record Continuous Memory Diagnostic Trouble Codes (CMDTCs).
- Clear the continuous DTCs and carry out the self-test diagnostics for the PCM.
- If the DTCs retrieved are related to the concern, go to PCM DTC Chart. For all other DTCs, Refer to «MULTIFUNCTION ELECTRONIC MODULES»(ref-372773) .
- If no DTCs related to the concern are retrieved, GO to «SYMPTOM CHART»(ref-372803-S17598489022010093000000) .
DTC Charts
PCM DTC Chart
| DTC | Description | Action |
|---|---|---|
| P0512 | Starter Request Circuit - Circuit has Power With the Ignition in the OFF Position | CARRY OUT the Ignition Switch Component Test. Refer to COMPONENT TESTING for component testing. If necessary, INSTALL a new ignition switch. If the ignition switch passed the component test, REPAIR circuit CDC35 (BU/WH) for a short to power. |
| P1260 | Theft Detected, Vehicle Immobilized | REFER to DTC Chart in ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) . |
| All other DTCs | REFER to the Master DTC Chart in MULTIFUNCTION ELECTRONIC MODULES . |
PCM DTC CHART
Symptom Chart
Symptom Chart
| Condition | Possible Sources | Action |
|---|---|---|
| The engine does not crank | Battery Fuse(s) Starter motor Circuitry PCM Starter motor relay Anti-theft system Ignition switch Start diode | GO to PINPOINT TEST A . |
| One-Touch Integrated Start (OTIS) does not operate correctly | Circuitry PCM | GO to PINPOINT TEST B . |
| The engine cranks slowly | Battery Starter motor Circuitry | CARRY OUT the Starter Motor component tests. |
| Unusual starter noise | Starter motor mounting Starter motor Incorrect starter drive engagement | GO to PINPOINT TEST C . |
| The starter spins but the engine does not crank | Starter motor Damaged flexplate/ring gear teeth | INSPECT the starter motor mounting and engagement. REFER to STARTER MOTOR DRIVE GEAR AND FLYWHEEL RING GEAR INSPECTION . INSPECT the flexplate/ring gear for damaged, missing or worn teeth. REPAIR as necessary. |
SYMPTOM CHART
Pinpoint Test A: The Engine Does Not Crank
Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.
Pinpoint Test B: One-Touch Integrated Start (OTIS) Does Not Operate Correctly
Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.
Pinpoint Test C: Unusual Starter Noise
This pinpoint test is intended to diagnose the following
- Starter motor
- Ring gear
Scheme 19
- 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-372803-S14409009632010093000000) . TEST the system for normal operation.
- C2 CHECK FOR ENGINE NOISE Ignition OFF. 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-372759) to continue diagnosis.
- C3 CHECK FOR UNUSUAL WEAR Remove the starter motor. Inspect the ring gear for damaged or worn teeth. Refer to «ENGINE - 3.5L»(ref-372749) or «ENGINE - 3.5L GTDI»(ref-372750) . Is the noise due to ring gear tooth damage? Yes: INSTALL a new flexplate ring gear. Refer to «ENGINE - 3.5L»(ref-372749) or «ENGINE - 3.5L GTDI»(ref-372750) . EXAMINE the starter pinion teeth. If damaged, INSTALL a new starter motor. REFER to «STARTER MOTOR»(ref-372803-S14409009632010093000000) . TEST the system for normal operation. No: INSTALL a new starter motor. REFER to «STARTER MOTOR»(ref-372803-S14409009632010093000000) . TEST the system for normal operation.