Acura TSX / Honda Accord CL. Manual — part 665

Is there battery voltage?

YES: Check for loose wires or poor connections at terminal E12 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 (see HOW TO
REMOVE THE ECM/PCM FOR TESTING ).

NO: Repair open in the wire between the radiator fan relay, the condenser fan relay, and the
ECM/PCM.

Fig. 77: Measuring The Voltage Between The No. 12 Terminal Of ECM/PCM Connector E
(31P) & Body Ground (ECM/PCM Connectors Connected)

2004 Acura TSX

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING

1. Check the No. 9 (20A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5A) fuse in the under-

dash fuse/relay box.

Are the fuses OK?

YES: Go to step 2.

NO: Replace the fuse(s), and recheck.

2. Check the engine coolant temperature, throttle position, and idle speed (use the HDS PGM-FI data list if

possible).

Is the coolant temperature, throttle position, and idle speed OK?

YES: Go to step 3.

NO: Troubleshoot and repair the cause of the high engine coolant temperature, low idle, or
excessively high throttle position sensor reading.

Fig. 78: Coolant Temperature, Throttle Position & Idle Speed Test Specifications Table

3. Remove the compressor clutch relay from the under-hood fuse/relay box, and test it (see POWER

RELAY TEST ).

Is the relay OK?

YES: Go to step 4.

NOTE:

After replacing the ECM/PCM, do the following items:

z

ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN
PROCEDURE ).

z

Enter the anti-theft codes for the radio and navigation system, then
enter the customer's radio station presets.

z

Replace ECM/PCM procedure with HDS.

NOTE:

Do not use this troubleshooting procedure if the fans are also inoperative, refer
to the symptom troubleshooting index.

2004 Acura TSX

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

NO: Replace the compressor clutch relay.

4. Measure the voltage between the No. 1 terminal of the compressor clutch relay 4P socket and body

ground.

Is there battery voltage?

YES: Go to step 5.

NO: Replace the under-hood fuse/relay box.

Fig. 79: Measuring The Voltage Between The No. 1 Terminal Of The Compressor Clutch
Relay 4P Socket & Body Ground

5. Connect the No. 1 and No. 2 terminals of the compressor clutch relay 4P socket with a jumper wire.

Does the compressor clutch click?

YES: Go to step 6.

NO: Go to step 14 .

2004 Acura TSX

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX

Fig. 80: Connecting The No. 1 & No. 2 Terminals Of The Compressor Clutch Relay 4P Socket
With A Jumper Wire

6. Disconnect the jumper wire.

7. Turn the ignition switch ON (II).

8. Measure the voltage between the No. 4 terminal of the compressor clutch relay 4P socket and body

ground.

Is there battery voltage?

YES: Go to step 9.

NO: Repair open in the BLK/YEL wire between the No. 30 fuse in the under-dash fuse/relay
box and the compressor clutch relay.

2004 Acura TSX

2004 AUTOMATIC A/C SYSTEMS Climate Control System - TSX