Acura TSX / Honda Accord CL. Manual — part 666

Fig. 81: Measuring The Voltage Between The No. 4 Terminal Of The Compressor Clutch
Relay 4P Socket & Body Ground

9. Turn the ignition switch OFF.

10. Reinstall the compressor clutch relay.

11. Make sure the A/C switch is OFF.

12. Turn the ignition switch ON (II).

13. Using a backprobe set, measure the voltage between the No. 18 terminal of ECM/PCM connector E (31P)

and body ground with the ECM/PCM connectors connected.

Is there battery voltage?

YES: Check for loose wires or poor connections at terminal E18 of the ECM/PCM connector
E (31P). If the connections are good, substitute a known-good ECM/PCM, and recheck. If
the symptom/indication goes away, replace the original ECM/PCM.

2004 Acura TSX

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

NO: Repair open in the wire between the compressor clutch relay and the ECM/PCM.

Fig. 82: Measuring The Voltage Between The No. 18 Terminal Of ECM/PCM Connector E
(31P) & Body Ground (ECM/PCM Connectors Connected)

14. Disconnect the jumper wire.

15. Disconnect the compressor clutch 3P connector.

16. Check for continuity between the No. 2 terminal of the compressor clutch relay 4P socket and the No. 2

terminal of the compressor clutch 3P connector.

Is there continuity?

YES: Check the compressor clutch clearance, and the compressor clutch field coil (see
COMPRESSOR CLUTCH CHECK ). Repair as needed.

NO: Repair open in the wire between the compressor clutch relay and the compressor clutch.

2004 Acura TSX

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

Fig. 83: Checking For Continuity Between The No. 2 Terminal Of The Compressor Clutch Relay
4P Socket & The No. 2 Terminal Of The Compressor Clutch 3P Connector

A/C PRESSURE SWITCH & THERMAL PROTECTOR CIRCUIT
TROUBLESHOOTING

1. Turn the ignition switch ON (II).

2. Press the AUTO button, then press the A/C button and check the display.

Does the display indicate A/C on?

YES: Go to step 3.

NO: Check for loose or poor connection at the climate control connector. If the connections
are OK, replace the audio-HVAC display panel.

3. Disconnect the thermal protector 3P connector.

2004 Acura TSX

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

4. Turn the ignition switch ON (II).

5. Measure the voltage between the No. 1 terminal of the thermal protector 3P connector and body ground.

Is there about 5 V or more?

YES: Go to step 6.

NO: Go to step 20 .

Fig. 84: Measuring The Voltage Between The No. 1 Terminal Of The Thermal Protector 3P
Connector & Body Ground

6. Turn the ignition switch OFF.

7. Check for continuity between the No. 1 and No. 3 terminals of the thermal protector.

Is there continuity?

YES: Go to step 8.

2004 Acura TSX

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX