NO.23 A/C DOES NOT WORK SUFFICIENTLY [LF]

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NO.23 A/C DOES NOT WORK SUFFICIENTLY [LF]

B3E010318881W25

23 | A/C DOES NOT WORK SUFFICIENTLY.
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DESCRIPTION | A/C compressor magnetic clutch does not engage when the A/C switch is turned on.

POSSIBLE CAUSE

• Improper refrigerant charging amount
• Open circuit A/C magnetic clutch
• Open circuit in wiring harness between A/C relay and A/C magnetic clutch
• Poor GND of A/C magnetic clutch
• Refrigerant pressure switch is stuck open.
• A/C relay is stuck open.
• Seized A/C compressor
• Open circuit in wiring harness between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier

Diagnostic procedure

STEP | INSPECTION | RESULTS | ACTION
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1 | Connect the WDS or equivalent to the DLC-2. Retrieve any continuous memory, KOEO and KOER DTCs using WDS or equivalent. Are there any DTCs displayed? | Yes | DTC is displayed: Go to appropriate DTC inspection. (See DTC TABLE [LF].)
No | No DTC is displayed: Go to the next step.
2 | Disconnect A/C compressor connector. Start engine and turn A/C switch on. Is there correct voltage A/C compressor magnetic clutch terminal? Specification More than 10.5 V | Yes | Inspect for GND condition of magnetic clutch on A/C compressor. • If GND condition is normal, inspect for open circuit magnetic clutch coil.
No | Go to the next step.

3

Disconnect the refrigerant pressure switch connector.
Connect jumper wire between A/C high-pressure switch terminal.
Connect jumper wires between refrigerant pressure switch terminal.
Connect the WDS or equivalent to the DLC-2.
Access AC_REQ PID.
Turn the ignition switch to the ON position.
Turn A/C switch on and set blower fan at any speed.
Does AC_REQ PID read On?

Yes

Inspect refrigerant pressure switch operation.
• If switch is normal, go to the next step.

No | Inspect for following: • A/C switch is stuck open. • Open circuit in wiring harness between refrigerant pressure switch and PCM terminal 1AP • Open circuit of blower motor fan switch and resistor (if blower motor does not operate) • Evaporator temperature sensor and A/C amplifier
4 | Remove jumper wire from the switch connector. Reconnect connector to refrigerant pressure switch. Start the engine and turn the A/C switch on. Does the fan operate? | Yes | Inspect for stuck open A/C relay. Replace if necessary.
No | Inspect following and repair or replace if necessary: • Refrigerant charging amount • A/C compressor for being seized

5

Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING [LF].)
• If malfunction remains, inspect related Service information perform repair or diagnosis.

  - If vehicle repaired, troubleshooting completed.
  - If vehicle not repaired or additional diagnostic information not available, replace the PCM.
  (See PCM REMOVAL/INSTALLATION [LF].)