NO.23 A/C DOES NOT WORK SUFFICIENTLY

id0103f2802900

23

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

23	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 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 between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier

Diagnostic procedure

STEP	INSPECTION	RESULTS	ACTION
1	Connect the WDS or equivalent to the DLC-2. Retrieve any continuous memory, KOEO and KOER DTCs. Are there any DTCs displayed?	Yes	DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE.)
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 terminal of the A/C compressor magnetic clutch connector? Specification 10.5 V or more	Yes	Inspect for the GND condition of magnetic clutch on the A/C compressor. If the GND condition is normal, inspect for an open circuit in the magnetic clutch coil.
2		No	Go to the next step.
3	Disconnect the refrigerant pressure switch connector. Connect the jumper wire between the terminals of the A/C high pressure switch connector. Connect the jumper wires between the terminals of the refrigerant pressure switch connector. Connect the WDS or equivalent. 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 the refrigerant pressure switch operation. If the switch is normal, go to the next step.
3		No	Inspect for the following: • The A/C switch is stuck open. • Open circuit between refrigerant pressure switch and PCM terminal 4W • Open circuit between blower motor fan switch and resistor (if blower motor does not operate) • Evaporator temperature sensor and A/C amplifier
4	Remove the 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 seizure
5	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis.