ML10 - Malfunction Indicator Light Intermittent On

NOTE: If vehicle will not start, perform Pinpoint Test AA1. AA1 - Identify Type of No Start

If pass codes are output, continue with this test step.

- Enter Key On Engine Off Continuous Monitor Diagnostic Test Mode.

- Observe Analog Volt/Ohm Meter (VOM) or STAR LED for indication of a fault while a small section of the EEC-IV system harness is wiggled, shaken or bent in the following locations:

- Harness closest to Data Link Connector to the dash panel.

- Dash panel to the Powertrain Control Module (PCM).

- Dash panel to the Malfunction Indicator Light (MIL).

- Is a fault indicated?

Yes -- Service short to ground. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Unable to duplicate fault at this time. If the MIL flashed on intermittently with pass codes (111-10-111), then testing is complete. The fault occurred over 40/80 warm-up cycles ago. Diagnostic Trouble Codes are not stored in memory beyond 40/80 warm-up cycles.