NO.23 A/C DOES NOT WORK SUFFICIENTLY [L3 R.H.D.]


23	A/C DOES NOT WORK SUFFICIENTLY.
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 in 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


STEP	INSPECTION	RESULTS	ACTION
1	Connect the WDS or equivalent to the DLC-2. Retrieve any continuous memory, KOEO and KOER DTCs using the WDS or equivalent. Are there any DTCs displayed?	Yes	DTC is displayed: Go to appropriate DTC inspection. (See DTC TABLE [L3 R.H.D.].)
1		No	No DTC is displayed: Go to the next step.
2	Disconnect the A/C compressor connector. Start engine and turn the A/C switch on. Is the A/C compressor magnetic clutch terminal as specified? Specification More than 10.5 V	Yes	Inspect the A/C compressor magnetic clutch for GND connection. • If GND connection is normal, inspect for open circuit in the magnetic clutch coil.
2		No	Go to the next step.
3	Disconnect the refrigerant pressure switch connector. Connect jumper wires between the A/C high-pressure switch terminals. Connect jumper wires between the refrigerant pressure switch terminals. Connect the WDS or equivalent to the DLC-2. Access the AC_REQ PID. Turn the ignition switch to the ON position. Turn the A/C switch on and set the blower fan at any speed. Does the AC_REQ PID read "On"?	Yes	Inspect refrigerant pressure switch operation. • If the switch is normal, go to the next step.
3		No	Inspect for the following: • A/C switch is stuck open. • Open circuit in wiring harness between refrigerant pressure switch and PCM terminal 97 • 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 the connector to the 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.
4		No	Inspect the following and repair or replace if necessary: • Refrigerant charging amount • A/C compressor for being seized
5	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. (See ENGINE SYMPTOM TROUBLESHOOTING [L3 R.H.D.].) • If any malfunction remains, inspect related service information, and repair or diagnosis. - If the vehicle is repaired, troubleshooting is completed. - If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [L3].)