A/C Condenser Fan High Speed Circuit Troubleshooting
- Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the SYMPTOM TROUBLESHOOTING INDEX .
- Before doing any symptom troubleshooting, check for PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
- Check the No. 5 (20 A) and No. 21 (7.5 A) in the under-hood fuse/relay box.
Are the fuses OK?
YES -Go to step 2.
NO -Replace the fuse(s), and recheck. If fuse(s) blow again, check for a short in the No. 5 (20 A) fuse and No. 21 (7.5 A) fuse circuits.
- Remove the relay circuit board (see
REMOVAL AND INSTALLATION
) from the under-hood fuse/relay box, and test the A/C condenser fan relay and the fan control relay (see
FIVE-TERMINAL TYPE
).
Are the relays OK?
YES -Go to step 3.
NO -Replace the relay circuit board.
- Reinstall the relay circuit board.
- Jump the SCS line with the HDS.NOTE: This step must be done to protect the ECM/PCM from damage.
- Disconnect ECM/PCM connector A (49P).
- Turn the ignition switch to ON (II).
- Measure the voltage between ECM/PCM connector A (49P) terminal No. 6 and body ground.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES -Go to step 8.
NO -Repair an open in the wire between the under-hood fuse/relay box and the ECM/PCM. If the wire is OK, replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).
- Turn the ignition switch to LOCK (0).
- Connect ECM/PCM connector A (49P) terminals No. 5, No. 6, and No. 22 to body ground with jumper wires.
- Turn the ignition switch to ON (II).
Does the A/C condenser fan run on high?
YES -Check for loose wires or poor connections at ECM/PCM connector A (49P) terminals No. 5, No. 6, and No. 22. If the connections are good, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), and recheck. If the symptom/indication goes away, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).
NO -Check for an open in the wire between the under-hood fuse/relay box and body ground. If the wire is OK, check for poor ground at G301 (see LEFT ENGINE COMPARTMENT WIRE HARNESS (ENGINE COMPARTMENT BRANCH) ).