Civic L4-1668cc 1.7L SOHC MFI (2003)
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.
NO - Repair short in the wire between the No.20 IG (40A) fuse and the under-dash fuse/relay box. Also replace the No.20 IG (40A) fuse.
10. Try to start the engine.
Does the engine start?
YES - Go to step 11.
NO - Go to step 14.
11. Turn the ignition switch OFF.
12. Connect ECM/PCM connector terminal E31 to body ground with a jumper wire.
13. Turn the ignition switch ON (II).
Is the MIL on?
YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the
symptom/indication goes away with a known-good ECM/PCM, 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.
14. Turn the ignition switch OFF.
15. Inspect the No.6 ECU (ECM/PCM) (15A) fuse in the under-hood fuse/relay box.
Is the fuse OK?
YES - Go to step 22.
NO - Go to step 16.
16. Remove the blown No.6 ECU (ECM/PCM) (15A) fuse in the under-dash fuse/relay box
17. Remove the glove box and PGM-FI main relay 1 (A).