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 3.
NO - Go to 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.n
NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/ PCM.n
|6.||Momentarily connect the under-hood fuse/relay box 14P 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.n
NO - Check the A/C system for other symptoms.n