NO.23 A/C DOES NOT WORK SUFFICIENTLY [L8, LF, L5]

id010346802900

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 the A/C magnetic clutch

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

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 the A/C magnetic clutch • Open circuit in wiring harness between 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 in wiring harness 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. Switch the ignition to ON (Engine off). Retrieve any DTCs. Are there any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC inspection. (See DTC TABLE [L8, LF, L5].)
1		No	No DTC is displayed: Go to the next step.
2	Disconnect 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 10.5 V or more	Yes	Inspect the ground condition of magnetic clutch on A/C compressor. If the ground 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 a jumper wire between the A/C high pressure switch terminal. Connect a jumper wire between the refrigerant pressure switch terminal. Switch the ignition to ON. Turn the A/C switch on and the set blower fan to any speed. Does the A/C work?	Yes	Inspect the refrigerant pressure switch operation. If the switch is normal, go to the next step.
3		No	Inspect the following: • A/C switch is stuck open. • Open circuit in the wiring harness between the refrigerant pressure switch and PCM terminal 1AW • Open circuit in the wiring harness between the blower motor fan switch and the 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 whether A/C relay is stuck open. 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. (See SYMPTOM DIAGNOSTIC INDEX [L8, LF, L5].) ― If the malfunction remains, inspect the related Service Information and perform 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 [L8, LF, L5].)