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