#
NO.24 A/C ALWAYS ON/A/C COMPRESSOR RUNS CONTINUOUSLY [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513)

BME010300103229

24 | A/C always ON or A/C compressor runs continuously
DESCRIPTION | • A/C compressor magnetic clutch does not disengage.
POSSIBLE CAUSE | • Stuck engagement • A/C relay is stuck closed. • Short to GND between A/C switch and PCM • Short to GND circuit between A/C relay and PCM • A/C relay to magnetic clutch circuit shorts to battery power.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Connect the WDS or equivalent to the DLC-2. • Turn the ignition switch to the ON position (Engine off). • Retrieve any DTC. • Is "PASSED" displayed? | Yes | No DTC is displayed: • Go to the next step.
No | DTC is displayed: • Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513).)
2 | • Start the engine and run it at idle. • Turn the A/C switch on. • Remove the A/C relay. • Does the A/C magnetic clutch disengage? | Yes | Inspect for the following: • A/C relay is stuck closed. • Short to GND circuit between A/C relay and PCM terminal 69

  - If both items are normal, go to the next step.

No | Inspect if circuit between the A/C relay and the magnetic clutch shorts to battery power circuit. • If circuit is normal, inspect the magnetic clutch stuck engagement or clearance.
3 | • Disconnect the refrigerant pressure switch connector. • Start the engine and turn the A/C switch on.

  Note

  • The A/C should not work when the connector disconnected. If the A/C remains working, short to GND circuit may be present.

• Does the A/C remain working?
Yes
Inspect for short to GND circuit between the refrigerant pressure switch and PCM terminal 41.
No | Go to the next step.
4 | • Reconnect the refrigerant pressure switch connector. • Turn off the A/C switch.

  Note

  • The A/C should not work when the A/C switch is turned off. If the A/C remains working, short to GND circuit may be present.

• Does the A/C remain working?
Yes
Inspect for the following:
• Short to GND circuit between A/C switch and A/C amplifier
• Short to GND circuit between A/C amplifier and refrigerant pressure switch
No | Inspect for stuck closed A/C switch.
5 | • Verify test results.

  - If normal, return to diagnostic index to service any additional symptoms.
  - If malfunction remains, inspect related Service Information and perform repair or diagnosis.

  • If vehicle is repaired, troubleshooting completed.
  • If vehicle is not repaired or additional diagnostic information is not available, replace or reprogram the PCM.