ML - Testing Notes

NOTE:
You should enter this Pinpoint Test only when you have been directed here from Diagnostic Routines or Pinpoint Test QA.

REMEMBER:
To prevent the replacement of good components, be aware that the following non-Electronic Engine Controls (EEC) areas may be at fault:

- Fuse, bulb or socket.

This Pinpoint Test is intended to diagnose only the following:

- Self Test Output (STO) / Malfunction Indicator Light (MIL) Circuit

- Powertrain Control Module (PCM)

DESCRIPTION
The Malfunction Indicator Lamp (MIL) is intended to alert the driver of certain malfunctions in the EEC system. The MIL output is turned on when the strategy detects a fault in input/output circuits. The lamp will remain on as long as the fault is present. Regulations governing this lamp also require that the Diagnostic Trouble Codes (DTCs) be displayed by the flashing of this lamp.