NO.23 A/C DOES NOT WORK SUFFICIENTLY [LF, L3]


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 charging amount • Open A/C magnetic clutch • Open circuit 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 between the A/C switch and the PCM through both the refrigerant pressure switch and the A/C amplifier


STEP	INSPECTION	RESULTS	ACTION
1	Connect the WDS or equivalent to the DLC-2. Retrieve any continuous memory, KOEO and KOER DTCs. Are any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC test.
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 for the A/C compressor magnetic clutch connector? Specification More than 10.5 V	Yes	Inspect for the ground condition of the magnetic clutch on the A/C compressor. If the ground condition is normal, inspect for an open circuit on the magnetic clutch coil.
2		No	Go to the next step.
3	Disconnect the refrigerant pressure switch connector. Connect a jumper wire between the terminals of A/C high-pressure switch connector. Connect jumper wires between the terminals of the refrigerant pressure switch connector. Connect the WDS or equivalent to the DLC-2. Access the ACSW PID. Turn the ignition switch to the ON position. Turn the A/C switch on and set blower fan at any speed. Does the ACSW 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: • A/C switch is stuck open. • Open circuit between the refrigerant pressure switch and PCM terminal 1AC • Open circuit between the blower motor fan switch and the resistor (if blower motor does not operate) • Evaporator temperature sensor and the A/C amplifier
4	Remove the jumper wire from switch connector. Reconnect the connector to refrigerant pressure switch. Start the engine and turn the A/C switch on. Does the fan operate?	Yes	Inspect if the A/C relay is stuck open. Replace if necessary.
4		No	Inspect the following and repair or replace if necessary: • Refrigerant charging amount • Seized A/C compressor
5	Verify the test results. • If normal, return to the diagnostic index to service any additional symptoms. • If the malfunction remains, replace the PCM.