Starting System Test: Notes
For circuit descriptions and diagrams, refer to the appropriate Wiring Diagrams.
WARNING:
On vehicles equipped with airbags, refer to WARNING before attempting steering wheel, steering column, or instrument panel component diagnosis or service. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury.
STARTING SYSTEM DIAGNOSIS
| CONDITION | POSSIBLE CAUSE | CORRECTION |
|---|---|---|
| STARTER FAILS TO ENGAGE | Battery discharged or faulty | Refer to BATTERY service article. Charge or replace battery, if required. |
| Starting circuit wiring faulty | Refer toFEED CIRCUIT RESISTANCE TEST and feed circuit test in this article. | |
| Starter relay faulty | Refer to RELAY TEST in this article. Replace relay, if necessary. | |
| Ignition switch faulty | Refer to IGNITION SWITCH or appropriate wiring information Replace switch, if necessary. | |
| Clutch interlock switch | Refer to DIAGNOSIS AND TESTING - SWITCH-CLUTCH PEDAL POSITION in the clutch article. Replace switch, if necessary. | |
| Starter solenoid faulty. | Refer to STARTER SOLENOID in this article. Replace starter assembly, if necessary. | |
| Starter assembly faulty. | If all other starting system components and circuits check OK, replace starter assembly. | |
| Faulty teeth on ring gear. | Rotate flywheel 360°, and inspect teeth and ring gear replaced if damaged. | |
| PCM double start override output failure. | Refer to 8.4L - PCM/TCM PROGRAMMING, CHECKING FOR AN INTERMITTENT DTC, POWERTRAIN VERIFICATION TEST & PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE Check for continuity between PCM and terminal 85. Repair open circuit as required. If OK, PCM may be defective. | |
| Starter button. | Inspect and test, if bad replace starter button. | |
| STARTER ENGAGES, FAILS TO TURN ENGINE | Battery discharged or faulty. | Refer to BATTERY for more information. Charge or replace battery as necessary. |
| Starting circuit wiring faulty | Refer toFEED CIRCUIT RESISTANCE TEST and the feed circuit test in this service information. Repair as necessary. | |
| Starter assembly faulty. | If all other starting system components and circuits check OK, replace starter assembly. | |
| Engine seized. | Refer to ENGINE DIAGNOSIS - MECHANICAL for diagnostic and service procedures. | |
| Loose connection at battery, PDC, starter, or engine ground. | Inspect for loose connections. | |
| Faulty teeth on ring gear. | Rotate flywheel 360°, and inspect teeth and ring gear replaced if damaged. | |
| STARTER ENGAGES, SPINS OUT BEFORE ENGINE STARTS | Broken teeth on starter ring gear. | Remove starter. Inspect ring gear and replace if necessary. |
| Starter assembly faulty. | If all other starting system components and circuits check OK, replace starter assembly. | |
| STARTER DOES NOT DISENGAGE | Starter improperly installed. | Install starter. Tighten starter mounting hardware to correct torque specifications. |
| Starter relay faulty. | Refer to STARTER RELAY Replace relay, if necessary. | |
| Ignition switch faulty. | Refer to IGNITION SWITCH in the steering section. Replace switch, if necessary. | |
| Starter assembly faulty. | If all other starting system components and circuits check OK, replace starter assembly. | |
| Faulty teeth on ring gear. | Rotate flywheel 360°, and inspect teeth and ring gear replaced if damaged. | |
| Starter button | Inspect and test, if bad replace starter button. |