Crank Request Signal Circuit Diagnosis

Circuit Description
The PCM controlled starter system consists of the following components:
^ The Ignition switch
^ The Crank Request circuit
^ The PCM
^ The Crank relay
^ The Transaxle Range switch
^ The Starter solenoid

When the Ignition switch is turned to the Crank position, B+ is sent to the PCM via the Crank Request circuit. The PCM has the ability to disallow starter operation if conditions inappropriate for starter operation exist. The PCM will disable the starter under the following conditions:
^ The engine is running
^ A correct VTD password is not received from the BCM
^ The vehicle operator continues to engage the starter for an extended period of time

If no inhibiting conditions are present, and the PCM detects voltage on the Crank Request circuit, the PCM grounds the Crank Relay Control circuit. Current from the Crank Maxifuse flows through the relay through the Transaxle Range switch (only in P/N) to the Starter solenoid.

Diagnostic Aids
This diagnostic procedure is intended to identify electrical malfunctions within the PCM controlled portion of the starting system. Use the Connector Test Adapter Kit J 35616-A for any test that requires probing the PCM harness connectors, electrical center fuse/relay cavities, component terminals or a component harness connector. Using this kit will prevent damage caused by improper probing of connector terminals.

Test Description
The numbers below refer to numbers on the diagnostic table.
2. Verifies whether the fault is present now.