Acura RL. Manual - part 573

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 5.

NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the driver's under-dash fuse/relay
box and the climate control unit.

5. Turn the ignition switch OFF.

6. Check for continuity between the climate control unit connector No. 31 terminal and body ground.

Fig. 75: Checking Continuity Between Climate Control Unit Connector No. 31 Terminal And
Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Check for loose wires or poor connections at the climate control unit 40P connector. If the
connections are good, substitute a known-good climate control unit, and recheck. If the symptom/
indication goes away, replace the original climate control unit.

NO - Check for an open in the wires between the climate control unit and body ground. If the wire is
OK, check for poor ground at G503 (see GROUND TO COMPONENTS INDEX ).

A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING

1. Check the No. 12 (7.5 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the

driver's under-dash fuse/relay box.

NOTE:



It is normal for the A/C compressor to turn off under certain conditions,
such as low idle, high engine coolant temperature, hard acceleration, or
high/low pressure.



Do not use this troubleshooting procedure if the fans are also
inoperative with the A/C on. Refer to the SYMPTOM
TROUBLESHOOTING INDEX.



Before doing symptom troubleshooting, check for powertrain DTCs
(see GENERAL TROUBLESHOOTING INFORMATION ).

2007 Acura RL

2005-08 HVAC HVAC - RL

Friday, June 05, 2009 2:25:43 PM

Page 75

Are the fuses OK?

YES - Go to step 2.

NO - Replace the fuses and recheck. If the fuses blow again, check for a short in the No. 12 (7.5 A)
and No. 30 (7.5 A) fuses circuit.

2. Connect the HDS to the DLC.

3. Start the engine.

4. Turn on the A/C.

5. Check the A/C CLUTCH in the PGM-FI Date List with the HDS.

Is the A/C CLUTCH on?

YES - Go to step 7.

NO - Go to step 6.

6. Using the HDS, confirm the following values in the PGM-FI Date List at idle.

DATA LIST REFERENCE

Are all the values within specifications?

YES - Go to step 7.

NO - Troubleshoot the value that is not within the specifications.

7. Remove the A/C 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 8.

NO - Replace the A/C compressor clutch relay.

8. Measure the voltage between the A/C compressor clutch relay 4P socket No. 1 terminal and body

ground.

ECT SENSOR 2

169-194°F (76-90°C)

TP SENSOR

About 0.5 V

RPM

More than 680

A/C PRESSURE SENSOR 196-3,138 kPa (2-32 kgf/cm

) [28-455 psi]

2007 Acura RL

2005-08 HVAC HVAC - RL

Friday, June 05, 2009 2:25:43 PM

Page 76

Fig. 76: Measuring Voltage Between A/C Compressor Clutch Relay 4P Socket 1 Terminal And
Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 9.

NO - Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).

9. Connect the A/C compressor clutch relay 4P socket No. 1 and No. 2 terminals with a jumper wire.

Fig. 77: Connecting A/C Compressor Clutch Relay 4P Socket 1 And 2 Terminals With Jumper
Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the A/C compressor clutch click?

YES - Go to step 10.

NO - Go to step 18.

10. Disconnect the jumper wire.

11. Turn the ignition switch ON (II).

12. Measure the voltage between the A/C compressor clutch relay 4P socket No. 4 terminal and body

ground.

2007 Acura RL

2005-08 HVAC HVAC - RL

Friday, June 05, 2009 2:25:43 PM

Page 77

Fig. 78: Measuring Voltage Between A/C Compressor Clutch Relay 4P Socket 4 Terminal And
Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 13.

NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the driver's under-dash fuse/relay
box and the A/C compressor clutch relay.

13. Turn the ignition switch OFF.

14. Reinstall the A/C compressor clutch relay.

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

16. Turn the ignition switch ON (II).

17. Using the backprobe set, measure the voltage between PCM connector E (31P) No. 27 terminal and

body ground with the PCM connectors connected.

Fig. 79: Measuring Voltage Between PCM Connector E (31P) 27 Terminal And Body Ground
With PCM Connectors Connected
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Check for loose wires or poor connections at PCM connector E (31P). If the connections are
good, check the PCM grounds. If the grounds are good, substitute a known-good PCM, and recheck.
If the symptom/indication goes away, replace the original PCM (see PCM REPLACEMENT ).

NO - Repair open in the wire between the A/C compressor clutch relay and the PCM.

2007 Acura RL

2005-08 HVAC HVAC - RL

Friday, June 05, 2009 2:25:43 PM

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