PGM-FI System

MIL Circuit Troubleshooting (cont'd)

 11-88  

  1. Measure voltage between ECM/PCM connector terminal E29 and body ground.

ECM/PCM 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.
  2. Disconnect ECM/PCM connector E (31P).
  1. Check for continuity between ECM/PCM connector terminal E29 and body ground.

ECM/PCM CONNECTOR E (31P)

Wire side of female terminals

Is there continuity?

YES - Repair short in the wire between the DLC and the ECM/PCM (E29).

NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM.

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

Is the MIL on?

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

NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM.