NO.22 A/C DOES NOT WORK SUFFICIENTLY [F2]

id010394851500

22

A/C DOES NOT WORK SUFFICIENTLY.

DESCRIPTION

The A/C compressor magnetic clutch does not engage when the A/C switch is turned on.

POSSIBLE CAUSE

•  Improper refrigerant charging amount

•  Open A/C magnetic clutch

•  Open circuit A/C relay and A/C magnetic clutch

•  Poor ground of A/C magnetic clutch

•  Refrigerant pressure switch is stuck open.

•  A/C relay is stuck open.

•  Seized A/C compressor

•  Open circuit between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier

22	A/C DOES NOT WORK SUFFICIENTLY.
DESCRIPTION	The A/C compressor magnetic clutch does not engage when the A/C switch is turned on.
POSSIBLE CAUSE	• Improper refrigerant charging amount • Open A/C magnetic clutch • Open circuit A/C relay and A/C magnetic clutch • Poor ground of A/C magnetic clutch • Refrigerant pressure switch is stuck open. • A/C relay is stuck open. • Seized A/C compressor • Open circuit between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier

Diagnostic procedure

STEP	INSPECTION	RESULTS	ACTION
1	Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed?	Yes	DTC is displayed: • Go to appropriate the DTC inspection. (See DTC TABLE [F2].)
1		No	No DTC is displayed: • Go to the next step
2	Disconnect the A/C compressor connector. Start the engine and turn the A/C switch on. Is there correct voltage at the A/C compressor magnetic clutch terminal? Specification More than 10.5 V	Yes	Inspect for ground condition of the magnetic clutch on the A/C compressor. • If ground condition is normal, inspect for open circuit magnetic clutch coil.
2		No	Go to the next step.
3	Connect the M-MDS to the DLC-2. Access ACSW PID on M-MDS. Start engine Turn A/C switch on and set blower fan at any speed. Does ACSW PID read ON?	Yes	Inspect stuck open A/C relay. Replace as necessary.
3		No	Go to the next step.
4	Disconnect the refrigerant pressure switch connector. Connect jumper wire between terminals of refrigerant pressure switch connector. Start the engine and turn the A/C switch on. Does the A/C work?	Yes	Inspect following and repair or replace if necessary: • Refrigerant charging amount • Refrigerant pressure switch operation
4		No	Inspect for following: • A/C switch is stuck open. • Open circuit in wiring harness between refrigerant pressure switch and PCM terminal 1Q • Open circuit of blower motor fan switch and resistor (if blower motor does not operate) • Evaporator temperature sensor and A/C amplifier • Open circuit between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier
5	• Verify test results. ― If normal, return to diagnostic index to service any additional symptoms. (See ENGINE SYMPTOM TROUBLESHOOTING [F2].) ― 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 the PCM. (See PCM REMOVAL/INSTALLATION [F2].)