A/C Signal Circuit Troubleshooting
- Start the engine.
- Turn the blower switch on.
- Turn the A/C switch on.
- Check the A/C CLUTCH in the DATA LIST with the HDS.
Does it indicate ON?
YES - Go to step 5.
NO - Do the A/C Pressure Switch Circuit Troubleshooting (see A/C PRESSURE SWITCH CIRCUIT TROUBLESHOOTING ).
- Check the A/C system.
Does the A/C system operate?
YES - The air conditioning system circuit is OK.
NO - Go to step 6.
- Turn the ignition switch OFF.
- Turn the ignition switch ON (II).
- Activate the A/C CLUTCH in the INSPECTION MENU with the HDS.
Is there a clicking noise from the A/C compressor clutch?
YES - Do the A/C System Test (see A/C SYSTEM TEST ).
NO - Go to step 9.
- Turn the ignition switch OFF.
- Jump the SCS line with the HDS.
- Disconnect PCM connector A (44P).
- Turn the ignition switch ON (II).
- Momentarily connect PCM connector terminal A14 to body ground with a jumper wire several times.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there a clicking noise from the A/C compressor clutch?
YES - Update the PCM if it does not have the latest software (see PCM UPDATING AND SUBSTITUTION FOR TESTING ), or substitute a known-good PCM (see HOW TO SUBSTITUTE THE PCM ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see PCM REPLACEMENT ).
NO - Check for poor connections or loose terminals at the A/C clutch relay and the PCM. If the connections are OK, check the A/C clutch relay (see POWER RELAY TEST ), repair open in the wire between the PCM (A14) and the A/C clutch relay and the other A/C systems.