EPC Warning Lamp Functional Check

Function test:
- Switch on ignition: EPC warning lamp must light up.

If EPC indicator lamp does not light up when ignition is switched on:
- Check wire from the ECM to the Electronic Power Control (EPC) warning lamp as follows:







If EPC warning lamp does not light up when ignition is switched on, continue test as follows:
- Start engine and let run at idle: The EPC warning lamp must go out after one second.

If EPC warning lamp does not go out:
- Check DTC memory, repair any malfunctions and then erase DTC memory, Checking and erasing DTC memory.

If there no DTCs are stored:







- Read readiness code. If DTC memory was erased or the Engine Control Module (ECM) was disconnected from the continuous B+ supply, the readiness code must be re-generated.

Refer to "Monitors, Trips and/or Drive Cycle (Readiness Code)/Readiness Code, Reading" and "Monitors, Trips and/or Drive Cycle (Readiness Code)/Readiness Code, Generating" under Powertrain Management/Computers and Control Systems Testing and Inspection