NO.23 A/C DOES NOT WORK SUFFICIENTLY [WL-C, WE-C]

id0103b6802900

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 charge amount

•  Open A/C switch magnetic clutch

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

•  Poor ground 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

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 charge amount • Open A/C switch magnetic clutch • Open circuit between A/C relay and A/C magnetic clutch • Poor ground 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

Diagnostic Procedure

STEP	INSPECTION	RESULTS	ACTION
1	Perform the self-test function using the M-MDS. Turn the engine switch to the ON position (Engine off). Retrieve any DTCs. Are any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)].) Communication error message is displayed: Inspect the following: • Open circuit between main relay and PCM terminal 201, 203, 205 • Open circuit main relay and PCM terminal 219 • Main relay stuck open • Open or poor ground circuit (PCM terminal 202, 204, 206) • Poor connection to vehicle body ground
1		Yes	No DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)].)
2	Disconnect the A/C compressor connector. Start the engine and turn the A/C switch to the ON position. Is there correct voltage at the terminal of the A/C compressor magnetic clutch connector? 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 the magnetic clutch coil for an open circuit.
2		No	Go to the next step.
3	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 to the ON position. Is there correct voltage at the terminal of the A/C compressor magnetic clutch connector? Specification More than 10.5 V	Yes	Inspect refrigerant pressure switch operation. If switch is normal, go to the next step.
3		No	Inspect the following: • A/C switch is stuck open • Open circuit between refrigerant pressure switch and A/C relay • 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 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 A/C operate?	Yes	Inspect for a stuck open A/C relay. Replace if necessary.
5		No	Inspect following and repair or replace if necessary: • Refrigerant charging amount • Seized A/C compressor
6	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [WL-C, WE-C].) • If the malfunction remains, inspect the related Service Information and perform repair or diagnosis. ― If the vehicle is repaired, troubleshooting completed. ― If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if later calibration is available. Retest.