Circuit/System Verification

Ignition ON, verify that no starter relay, theft deterrent, or automatic transmission DTCs are set that would cause the ECM not to enable engine starting.
- If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
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 IMS parameters display Park/Neutral.
- If the TCM IMS parameter does not indicate Park/Neutral. Refer to Transmission Internal Mode Switch Logic
- If the ECM Park/Neutral parameter does not indicate Park/Neutral. Refer to ECM Park Switch Circuit Malfunction below.
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 STRTR relay does not click or the engine does not crank, refer to Starter Relay Circuit Malfunction below.