Inspect the No. 20 IG1 (40A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Repair open in the wire between the No. 20 IG (40A) fuse and the gauge assembly. If the wires are OK, test the ignition switch (see page 22-83). NO - Repair short in the wire between No. 20 IG (40A) fuse and the under-dash fuse/relay box. Also replace the No. 20 IG1 (40A) fuse. Try to start the engine. Does the engine start? YES - Go to step 14. NO - Go to step 17. Turn the ignition switch OFF. Connect ECM/PCM connector terminal E31 and body ground with a jumper wire. ECM/PCM CONNECTOR E (31P) Wire side of female terminals Turn the ignition switch ON (II). Is the MIL on? YES - Substitute a known-good ECM/PCM and recheck (see page 11-313). If symptom/indication goes away, replace the original ECM/PCM. NO - Check for an open in the wire between the ECM/PCM (E31) and the gauge assembly. Also check for a blown MIL bulb. If the wires and the bulb are OK, replace the gauge assembly.

Turn the ignition switch OFF. Inspect the No. 6 ECU (ECM/PCM) (15A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Go to step 25. NO - Go to step 19. Remove the blown No. 6 ECU (ECM/PCM) (15A) fuse in the under-dash fuse/relay box. Remove the PGM-FI main relay 1 (A). Check for continuity between body ground and the PGM-FI main relay 1 4P connector terminals No. 2 and No. 4 individually. Wire side of female terminals Is there continuity? YES - Repair short in the wire between the No. 6 ECU (ECM/PCM) (15A) fuse and the PGM-FI main relay 1. Also replace the No. 6 ECU (ECM/PCM) (15A) fuse. NO - Go to step 22.