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 the WDS or equivalent. Turn the engine switch to the ON position. Retrieve any DTC. Is DTC displayed?	Yes	DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].) Communication error message is displayed: Inspect for the 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 the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
2	Disconnect the A/C compressor connector. Start the engine and turn the A/C switch on. Is there correct voltage at terminal of the A/C compressor magnetic clutch connector? Specification More than 10.5 V	Yes	Inspect for GND condition of magnetic clutch on the A/C compressor. If GND condition is normal, inspect the magnetic clutch coil for open circuit.
2		No	Go to the next step.
3	Disconnect refrigerant pressure switch connector. Connect a jumper wire between terminals of the refrigerant pressure switch connector. Turn the engine switch to the ON position. Turn the A/C switch on and set the blower fan at any speed. Measure the voltage of PCM terminal 84. Is the voltage below 1.0 V?	Yes	Inspect the 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 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 the A/C cut-off operation. Does the A/C cut-off work properly?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning part according to the A/C cut-off system inspection results.
5	Remove a jumper wire from the switch connector. Reconnect 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.
5		No	Inspect the following and repair or replace if necessary: • Refrigerant charging amount • Seized A/C compressor
6	Verify test results. • If normal, return to diagnostic index to service any additional symptoms. • If malfunction remains, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)