Measure the voltage between the No. 6 terminal of ECM/PCM connector B (24P) and body ground with the ECM/PCM connectors connected. ECM/PCM CONNECTOR B (24P) Wire side of female terminals Is there battery voltage? YES - Check for loose wires or poor connections at ECM/PCM connector B (24P). If the connections are good, substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/PCM. NO - Repair open in the wire between the radiator fan relay, the condenser fan relay and the ECM/PCM.

Check the No. 1 (20A) fuse in the under-hood fuse/relay box and the No. 14 (10A) fuse in the under-dash fuse/relay box. Are the fuses OK? YES - Go to step 2. NO - Replace the fuse(s) and recheck. Check the engine coolant temperature (use the Honda PGM Tester PGM-FI data list if possible). Is the coolant temperature above normal? YES - Troubleshoot and repair the cause of the high engine coolant temperature. NO - Go to step 3. Remove the compressor clutch relay from the under-hood fuse/relay box and test it (see page 22-80). Is the relay OK? YES - Go to step 4. NO - Replace the compressor clutch relay. Measure the voltage between the No. 2 terminal of the compressor clutch relay 4P socket and body ground. COMPRESSOR CLUTCH RELAY 4P SOCKET Is there battery voltage? YES - Go to step 5. NO - Replace the under-hood fuse/relay box.