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A/C Signal Circuit Troubleshooting

A/C Signal Circuit Troubleshooting

1. Turn the ignition switch ON (II).




2. Momentarily connect ECM/PCM connector terminals A24 and E18 with a jumper wire several times.

Is there a clicking noise from the A/C compressor clutch?

YES - Go to step 3.

NO - Go to step 6.

3. Start the engine.
4. Turn the blower switch ON.
5. Turn the A/C switch ON.

Does the A/C operate?

YES - The air conditioning signal is OK.

NO - 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.




6. Momentarily connect under-hood fuse/relay box 1 4P connector terminal No.10 to body ground with a jumper wire several times.

Is there clicking noise from the A/C compressor clutch?

YES - Repair open in the wire between the ECM/PCM (E18) and the A/C clutch relay.

NO - Check the A/C system for other symptoms.
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