Circuit/System Verification

Ignition ON, verify that no starter relay, theft deterrent, or automatic transmission DTCs are set that would cause the ECM to disable starting.
- If DTCs are set, refer to DIAGNOSTIC TROUBLE CODE (DTC) LIST - VEHICLE DIAGNOSTIC INFORMATION .
Ignition ON, observe the scan tool BCM Current Power Mode parameter. Place ignition switch in the crank position, the parameter should display Crank Request.
- If not the specified value, refer to POWER MODE MISMATCH .
Transmission range selector in park, verify the scan tool ECM PNP Switch and TCM Tr Switch parameters display Park/Neutral.
- If the TCM TR Switch parameter does not indicate Park/Neutral. Refer to TCM TR SWITCH CIRCUIT MALFUNCTION .
- If the ECM Park/Neutral parameter does not indicate Park/Neutral. Refer to ECM PARK SWITCH CIRCUIT MALFUNCTION .
Transmission range selector in park or neutral, attempt to start the vehicle. The starter relay should click and the engine should begin cranking.
- If the crank relay does not click or the engine does not crank, refer to STARTER RELAY CIRCUIT MALFUNCTION .