With Manufacturer's Scan Tool

Malfunction Indicator Lamp (MIL), Checking

- Switch on ignition:
Malfunction Indicator Lamp (MIL) must light-up.

If the Malfunction Indicator Lamp (MIL) does not light-up with ignition switched 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 Clearing Trouble Codes Clearing Diagnostic Trouble Codes

- Read-out the readiness code. If the DTC memory has been erased or the engine control module was disconnected from permanent positive, the readiness code must be generated again. Refer to Monitors Trips and/or Drive Cycle Monitors, Trips, Drive Cycles and Readiness Codes


If the MIL lights-up with ignition switched on, continue check as follows:
- Start engine and run at idle speed:
The MIL must go out after a few seconds.

If the MIL does not go out:
- Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory. Refer to Displaying & Reading Trouble Codes Reading Diagnostic Trouble Codes

If no DTC is 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. Refer to Displaying & Reading Trouble Codes Reading Diagnostic Trouble Codes

- Read-out the readiness code. If the DTC memory has been erased or the engine control module was disconnected from permanent positive, the readiness code must be generated again. Refer to Monitors Trips and/or Drive Cycle Monitors, Trips, Drive Cycles and Readiness Codes