NO.23 A/C DOES NOT WORK SUFFICIENTLY [MZR-CD (RF Turbo)]


23	A/C DOES NOT WORK SUFFICIENTLY
DESCRIPTION	• A/C compressor magnetic clutch does not engage when A/C switch is turned on.
POSSIBLE CAUSE	• Improper refrigerant charge amount • Open A/C switch magnetic clutch • Open circuit between A/C relay and A/C magnetic clutch • Poor GND of A/C magnetic clutch • Improper A/C magnetic clutch clearance • Refrigerant pressure switch is stuck open • A/C relay is stuck open • Improper A/C cut-off control • Open circuit between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier


STEP	INSPECTION	RESULTS	ACTION
1	Perform self-test function using WDS or equivalent. Turn engine switch to ON. Retrieve any DTC. Is DTC displayed?	Yes	DTC is displayed: Go to appropriate DTC test. Communication error message is displayed: Inspect for following: • Open circuit between PCM control relay and PCM terminal 53 or 79 • Open circuit PCM control relay and PCM terminal 69 • PCM control relay stuck open • Open or poor GND circuit (PCM terminal 65, 85, 103 or 104) • Poor connection vehicle body GND
1		Yes	No DTC is displayed: Go to appropriate DTC test.
2	Disconnect A/C compressor connector. Start engine and turn A/C switch to ON. Is there correct voltage at terminal of A/C compressor magnetic clutch connector? Specification More than 10.5 V	Yes	Inspect for GND condition of magnetic clutch on A/C compressor. If GND condition is okay, inspect magnetic clutch coil for open circuit.
2		No	Go to next step.
3	Disconnect refrigerant pressure switch connector. Connect jumper wire between terminals of refrigerant pressure switch connector. Turn engine switch to ON. Turn A/C switch on and set blower fan at any speed. Measure PCM terminal 84 voltage. Is voltage below 1.0 V?	Yes	Inspect refrigerant pressure switch operation. If switch is okay, go to next step.
3		No	Inspect for following: • A/C switch is stuck open • Open circuit between refrigerant pressure switch and PCM terminal 84 • Open circuit of blower motor fan switch and resistor (if blower motor does not operate) • Evaporator temperature sensor and A/C amplifier
4	Inspect A/C cut-off operation. Does A/C cut-off work properly?	Yes	Go to next step.
4		No	Repair or replace malfunctioning part according to A/C cut-off system inspection results.
5	Remove jumper wire from switch connector. Reconnect connector to refrigerant pressure switch. Start engine and turn A/C switch on. Does fan operate?	Yes	Inspect for stuck open A/C relay. Replace if necessary.
5		No	Inspect following and repair or replace as necessary: • Refrigerant charging amount • Seized A/C compressor
6	Verify test results. • If okay, return to diagnostic index to service any additional symptoms. • If malfunction remains, replace PCM. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)