PGM-FI System

MIL Circuit Troubleshooting (cont'd)

 11-87  

  1. Turn the ignition switch OFF.
  1. Turn the ignition switch ON (II).
  1. Measure voltage between ECM connector terminal E29 and body ground.

ECM CONNECTOR E (31P)

Wire side of female terminals

Is there about 5 V (or battery voltage)?

YES - Go to step 81.

NO - Go to step 78.

  1. Turn the ignition switch OFF.
  1. Disconnect ECM connector E (31P).

  1. Check for continuity between ECM connector terminal E29 and body ground.

ECM CONNECTOR E (31P)

Wire side of female terminals

Is there continuity?

YES - Repair short in the wire between the service check connector and the ECM (E29).

NO - Substitute a known-good ECM and recheck (see page 11-5). If symptom/indication goes away, replace the original ECM.

  1. Turn the ignition switch OFF.
  1. Disconnect ECM connector E (31P).
  1. Turn the ignition switch ON (II).

    Is the MIL on?

YES - Repair short in the wire between the gauge assembly and the ECM (E31). If the wires are OK, replace the gauge assembly.

NO - Substitute a known-good ECM and recheck (see page 11-5). If symptom/indication goes away, replace the original ECM.