PGM-FI System

MIL Circuit Troubleshooting (cont'd)

 11-80  

Is there continuity?

YES - Go to step 27.

NO - Replace the component that made continuity to body ground go away when disconnected. If the item is the ECM, substitute a known-good ECM and recheck (see page 11-5). If symptom/indication goes away, replace the original ECM.

Also replace the No. 6 ECU (ECM) (15 A) fuse.

  1. Disconnect the connectors of all these components.
  • PGM-FI main relay 2
  • ECM connector A (31P)
  • Injectors
  • Idle air control (IAC) valve
  • Top dead centre (TDC) sensor
  • Crankshaft position (CKP) sensor

  1. Check for continuity between the PGM-FI main relay 1 4P connector terminal No. 1 and body ground.

Is there continuity?

YES - Repair short in the wire between the PGM-FI main relay 1 and each item. Also replace the No. 6 ECU (ECM) (15A) fuse.

NO - Replace the PGM-FI main relay 1. Also replace the No 6 ECU (ECM) (15A) fuse.

  1. Inspect the No. 17 FUEL PUMP (15A) fuse in the under-dash fuse/relay box.

    Is the fuse OK?

YES - Go to step 41.

NO - Go to step 30.

  1. Remove the blown No. 17 FUEL PUMP (15A) fuse in the under-dash fuse/relay box.
  1. Disconnect ECM connector E (31P).
  1. Check for continuity between ECM connector terminal E9 and body ground.

ECM CONNECTOR E (31P)

Wire side of female terminals

Is there continuity?

YES - Go to step 33.

NO - Replace the No. 17 FUEL PUMP (15 A) fuse, and substitute a known-good ECM and recheck (see page 11-5). If symptom/indication goes away, replace the original ECM.