A/C Compressor Clutch Circuit Troubleshooting

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

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 refrigerant 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 any symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION )

Check the No 20 (7.5 A) fuse in the under-hood fuse/relay box, and the No 16 (7.5 A) fuse in the driver's under-dash fuse/relay box
Are the fuses OK?

YES -Go to step 2

NO -Replace the fuse(s) and recheck If the fuse(s) blow again, check for a short in the No 20 (7.5 A) fuse and the No 16 (7.5 A) fuse circuits
Connect the HDS to the DLC
Start the engine
Turn on the A/C
Check the A/C switch in the PGM-FI data list with the HDS
Is the A/C switch ON?

YES -Go to step 6

NO -go to A/C signal circuit troubleshooting (see A/C SIGNAL CIRCUIT TROUBLESHOOTING )

Using the HDS, confirm the following values in the PGM-FI Data List at idle

DATA LIST

TP SENSOR	About 0.5V
RPM	700-800
ECT SENSOR 2	176-212 °F (80-100 °C)
A/C SWITCH	ON
A/C CLUTCH	ON

Are all the values within specifications?

YES -Go to step 7

NO -Troubleshoot the value that is not within the specifications

Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
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 9

NO -Replace the A/C compressor clutch relay
Measure the voltage between A/C compressor clutch relay 4P socket terminal No 1 and body ground

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

Is there battery voltage?

YES -Go to step 10

NO -Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION )
Connect A/C compressor clutch relay 4P socket terminals No 1 and No 2 with a jumper wire

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

Does the A/C compressor clutch click?

YES -Go to step 11

NO -Go to step 20
Disconnect the jumper wire
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
Measure the voltage between A/C compressor clutch relay 4P socket terminal No 3 and body ground

Fig 3: Measuring Voltage Between A/C Compressor Clutch Relay 4P Socket Terminal 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 14

NO -Repair open in the wire between the No 16 (7 5 A) fuse in the driver's under-dash fuse/relay box and the A/C compressor clutch relay
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
Reinstall the A/C compressor clutch relay
Jump the SCS line with the HDS
NOTE: This step must be done to protect the powertrain control module (PCM) from damage
Disconnect PCM connector A (49P)
Connect PCM connector A (49P) terminal No 13 to body ground with a jumper wire

Fig 4: Connecting PCM Connector A (49P) Terminal 13 To Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
Does the A/C compressor click?

YES -Check for loose wires or poor connections at PCM connector A (49P) 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 ECM/PCM REPLACEMENT )

NO -Repair open in the wire between the A/C compressor clutch relay and the PCM
Disconnect the jumper wire
Disconnect the A/C compressor clutch 1P connector
Check for continuity between A/C compressor clutch relay 4P socket terminal No 2 and A/C compressor clutch 1P connector terminal No 1

Fig 5: Checking Continuity Between A/C Compressor Clutch Relay 4P Socket Terminal 2 And A/C Compressor Clutch 1P Connector Terminal 1

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Check the A/C compressor clutch clearance, and the compressor clutch field coil (see A/C COMPRESSOR CLUTCH CHECK ) Repair as needed

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