| 1. | Start the engine, and let it idle. |
| 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. Does it indicate ON? YES - Go to 5. NO - Do the A/C system test.n |
| 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 a clicking noise from the A/C compressor clutch? YES - Do the A/C system test.n NO - Go to 9. |
| 9. | Turn the ignition switch OFF. |
| 10. | Jump the SCS line with the HDS. |
| 11. | Disconnect ECM/PCM connector A (44P). |
| 12. | Turn the ignition switch ON (II). |
| 13. | Momentarily connect ECM/PCM connector terminal A14 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.n NO - Check for poor connections or loose terminals at the A/C clutch relay and the ECM/PCM. If the connections are OK, check the A/C clutch relay, repair open in the wire between the ECM/PCM (A14) and the A/C clutch relay and the other A/C systems.n |