( TF09E4DA20336112101FAAT00 )

( TF09E4DA20336112101FAAT00 )

A/C Signal Circuit Troubleshooting

Start the engine, and let it idle.

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 system test. ■

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 to LOCK (0).

Turn the ignition switch to 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. ■
NO	-	Go to Step 9 .

Turn the ignition switch to LOCK (0).

Jump the SCS line with the HDS.

Disconnect ECM/PCM connector A (49P).

Turn the ignition switch to ON (II).

Momentarily connect ECM/PCM connector terminal A15 to body ground with a jumper wire several times.

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

YES	-	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. ■
NO	-	Check for poor connections or loose terminals at the A/C compressor clutch relay and the ECM/PCM. If the connections are OK, check the A/C compressor clutch relay, repair open in the wire between the ECM/PCM (A15) and the A/C compressor clutch relay and the other A/C systems.■