Data Link Connector Diagnosis

Diagnostic Chart:

Wiring Diagram:

Circuit Description

There should always be a Malfunction Indicator Lamp (MIL) when the ignition is ON and engine OFF. Battery ignition voltage is supplied to the lamp. The PCM will turn the lamp ON by grounding the ignition feed circuit.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

2. This step verifies if the problem is in the Scan tool or the vehicle.

6. This step will check the ground circuits at the Data Link (DLC) connector.

9. The step will check for the battery and ignition feeds to the PCM.