Circuit Description
The PCM has the ability to disable starter operation if conditions inappropriate for starter operation exist. The PCM disables the starter if the engine is running, or if the vehicle operator attempts to engage the starter for an extended period of time.
The PCM controlled starter system consists of the following components:
| • | Starter enable relay |
| • | The Park Neutral Position switch |
| • | The ignition switch |
| • | The starter solenoid |
| • | The PCM |
Diagnostic Aids
The PCM Controlled Starter Diagnosis table is intended to identify electrical malfunctions that can occur with the system. For starter motor diagnosis and on-vehicle service, refer to Starting and Charging in Electrical Diagnosis.
Check for the following conditions:
| • | Poor connection at the PCM , the starter enable relay, the ignition switch or the starter solenoid. |
| Inspect harness connectors for the following conditions: |
| - | Backed out terminals |
| - | Improper mating |
| - | Broken locks |
| - | Improperly formed or damaged terminals |
| - | Poor terminal to wire connection |
| • | Damaged harness. |
| Inspect the wiring harness for damage. |
| • | Either of the following conditions can cause the PCM to disable starter operation: |
| - | The engine is running. |
| - | The starter has been continuously engaged for longer than 15 seconds. |
Test Description
The numbers below refer to the steps on the diagnostic table.
Step | Action | Value(s) | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||||||
Did you perform the Starting System Check? | -- | Go to Starting System Check | ||||||
3 | Is the vehicle equipped with an automatic transmission? | -- | ||||||
4 | Did you perform the Park Neutral Position (PNP) Circuit Diagnosis? | -- | ||||||
5 | Inspect the PCM connector for the following conditions and repair as necessary:
Did you find and repair a problem? | -- | ||||||
6 |
Important: Program the replacement PCM. Replace the PCM. Refer to Powertrain Control Module Replacement . Is the action complete? | -- | -- | |||||
7 | Attempt to start the vehicle. Does the engine crank? | -- | System OK |
