A/C Signal Circuit Troubleshooting
|1.||Start the engine.|
|2.||Turn the blower switch ON.|
|3.||Turn the A/C switch ON.|
|4.||Check the A/C CLUTCH in the DATA LIST with the HDS.|
Is it ON?
YES - Go to 5.
|5.||Check the A/C system.|
Does the A/C system operate?
YES - The air conditioning system circuit is OK.n
NO - Go to 6.
|6.||Turn the ignition switch OFF.|
|7.||Turn the ignition switch ON (II).|
|8.||Activate the A/C CLUTCH in the INSPECTION MENU with the HDS.|
Is there clicking noise from the A/C compressor clutch?
YES - Go to the A/C section, and look for the other symptoms.n
NO - Go to 9.
|9.||Momentarily connect the A/C compressor clutch relay 4P connector (into the under-hood fuse/relay box) termminal No. 3 to body ground with a jumper wire several times.|
Is there a clicking noise from the A/C compressor clutch?
YES - Repair open in the wire between the ECM connector No. 4 terminal No. 19 (test pin box terminal No. 100) and the A/C clutch relay.n
NO - Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.n