Malfunction Indicator Lamp: Testing and Inspection

Malfunction Indicator Lamp (MIL), Functional Check

- Turn on ignition.
- The Malfunction Indicator Lamp (MIL) must tight up.

If the Malfunction Indicator Lamp (MIL) does not light up with the ignition turned on:

- Check MIL lamp wiring / MIL lamp bulb using wiring diagram.

If OK:

- Check instrument cluster/ECM, and replace if necessary.

- Check DTC memory. If necessary, repair any malfunctions and then erase DTC memory. Refer to "Displaying and Reading Trouble Codes" under "Powertrain Management/Computers and Control Systems" Testing and Inspection

- Read-out the readiness code. Refer to "Monitors, Trips and/or Drive Cycle/Displaying Readiness Code" under "Powertrain Management/Computers and Control Systems" Testing and Inspection

If the DTC memory has been erased or the engine control module was disconnected from permanent positive, generate the readiness code again. Refer to "Monitors, Trips and/or Drive Cycle/Generating Readiness Code" under "Powertrain Management/Computers and Control Systems" Testing and Inspection

If the Malfunction Indicator Lamp (MIL) lights up with the ignition turned on, continue check as follows:

- Start engine and run at idle.
- The Malfunction Indicator Lamp (MIL) must go out after a few seconds.

If the Malfunction Indicator Lamp (MIL) does not go out:

- Check DTC memory. If necessary, repair any malfunctions and erase DTC memory. Refer to "Displaying and Reading Trouble Codes" under "Powertrain Management/Computers and Control Systems" Testing and Inspection

If no DTCs are stored:

- Check MIL lamp wiring using wiring diagram.

If OK:

- Check instrument cluster/ECM, and replace if necessary.

- Check DTC memory. If necessary, repair any malfunctions and then erase DTC memory.

- Read-out the readiness code. Refer to "Monitors, Trips and/or Drive Cycle/Displaying Readiness Code" under "Powertrain Management/Computers and Control Systems" Testing and Inspection

If the DTC memory has been erased or the engine control module was disconnected from permanent positive, generate the readiness code again. Refer to "Monitors, Trips and/or Drive Cycle/Generating Readiness Code" under "Powertrain Management/Computers and Control Systems" Testing and Inspection