DTC 34: ECM/PCM Power Source Circuit Unexpected Voltage Reset the ECM/PCM, refer to the '01 Civic Shop Manual on this CD (see page 11-468). Turn the ignition switch OFF. Wait 5 seconds. Turn the ignition switch ON (II). Is the MIL on and does it indicated DTC 34? YES - Go to step 5. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the No. 6 ECU (ECM/PCM) (15A) fuse in the under-hood fuse/relay box and at the ECM/PCM. Turn the ignition switch OFF. Disconnect ECM/PCM connector E (31P). Measure voltage between ECM/PCM connector terminal E7 and body ground. ECM/PCM CONNECTOR E (31P) Wire side of female terminals Is there battery voltage? YES - Go to step 11. NO - Go to step 8.

Remove the glove box. Remove the PGM-FI main relay 1 (A). Check for continuity between ECM/PCM connector terminal E7 and body ground. ECM/PCM CONNECTOR E (31P) Wire side of female terminals Is there continuity? YES - Repair short in the wire between the ECM/PCM (E7) and the PGM-FI main relay 1. NO - Replace the PGM-FI main relay 1. Reconnect ECM/PCM connector E (31P).