Circuit/System Verification

Ignition ON, verify that no brake pedal position sensor, 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 .
Ignition ON, observe the scan tool IPM Ignition Mode Switch parameter. Place the ignition mode switch in the crank position, the parameter should display CRANK.
- If not the specified value, refer to Power Mode Description and Operation .
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.
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 starter relay does not click or the engine does not crank, refer to Starter Relay Circuit Malfunction.