Starter Inhibit Relay Circuit Diagnosis

Starter Inhibit Relay Circuit Diagnosis






Circuit Description

The powertrain control module (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 Charging System Check (CS-144 Generator) Charging System Check (CS-144 Generator)Charging System Check (Battery Testing) Charging System Check (Battery Testing)Charging System Check (21-SI 200 Generator) Charging System Check (21-SI 200 Generator)Charging System Check (SCT) Charging System Check (SCT) or to Starting System Check Starting System Check in Engine Electrical.
* Inspect for the following components:

- Poor connection at the PCM
- The starter enable relay
- The ignition switch
- 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 wiring harness

* 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