A/C Compressor Clutch Circuit Troubleshooting
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 any symptom troubleshooting, check for powertrain DTCs.
  1. Check the No. 7 (7.5 A) fuse in the under-hood fuse/relay box, and the No. 36 (10 A) fuse in the under-dash fuse/relay box.
Are the fuses OK?
YES -
Go to Step 2 .
NO -
Replace the fuses and recheck. If fuses blow again, check for a short in the No. 7 (7.5 A) and No. 36 (10 A) fuse circuit.■
  1. Connect the HDS to the DLC.
  1. Start the engine.
  1. Turn on the A/C.
  1. Check the A/C CLUTCH in the PGM-FI Data List with the HDS.
Is the A/C CLUTCH on?
YES -
Go to Step 7 .
NO -
Go to Step 6 .
  1. Using the HDS, confirm the following values in the PGM-FI Date List at idle.
    TP SENSOR
    About 0.5 V
    RPM (min −1 )
    620±50−670±50
    ECT SENSOR 2
    176−212 °F (80−100 °C)
    A/C SWITCH
    ON
    A/C CLUTCH
    ON
    A/C PRESSURE SENSOR
    196−3,138 kPa (2−32 kgf/cm 3 ) [28−455 psi]

Are all the values within specifications?
YES -
Go to Step 7 .
NO -
Troubleshoot the value that is not within the specifications.■
  1. Remove the A/C compressor clutch relay from the under-hood fuse/relay box, and test it.
Is the relay OK?
YES -
Go to Step 8 .
NO -
Replace the A/C compressor clutch relay .■
  1. Measure the voltage between the A/C compressor clutch relay 4P socket terminal No. 1 and body ground.
Is there battery voltage?
YES -
Go to Step 9 .
NO -
Replace the under-hood fuse/relay box. ■