NO.23 A/C DOES NOT WORK SUFFICIENTLY [ZJ, ZY]

id0103b0802900

23

A/C DOES NOT WORK SUFFICIENTLY

DESCRIPTION

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

POSSIBLE CAUSE

•  Continuous memory DTC is stored

•  Poor ground of A/C magnetic clutch

•  Open A/C magnetic clutch

•  Refrigerant pressure switch malfunction (stuck open)

•  A/C switch malfunction (stuck open)

•  Evaporator temperature sensor and A/C amplifier malfunction

•  Open circuit in wiring harness between refrigerant pressure switch and PCM terminal 1AO

•  Open circuit of blower motor fan switch and resistor (if blower motor does not operate)

•  A/C relay malfunction (stuck open)

•  Improper refrigerant charging amount

•  Seized A/C compressor

•  PCM malfunction

23	A/C DOES NOT WORK SUFFICIENTLY
DESCRIPTION	• The A/C compressor magnetic clutch does not engage when the A/C is turned on.
POSSIBLE CAUSE	• Continuous memory DTC is stored • Poor ground of A/C magnetic clutch • Open A/C magnetic clutch • Refrigerant pressure switch malfunction (stuck open) • A/C switch malfunction (stuck open) • Evaporator temperature sensor and A/C amplifier malfunction • Open circuit in wiring harness between refrigerant pressure switch and PCM terminal 1AO • Open circuit of blower motor fan switch and resistor (if blower motor does not operate) • A/C relay malfunction (stuck open) • Improper refrigerant charging amount • Seized A/C compressor • PCM malfunction

Diagnostic procedure

STEP	INSPECTION	ACTION
1	Connect the M-MDS to the DLC-2. Perform the KOEO/KOER self test. (See KOEO/KOER SELF TEST [ZJ, ZY].) Are any continuous memory DTCs present?	Yes	Go to the appropriate DTC inspection. (See DTC TABLE [ZJ, ZY].)
1		No	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 10.5 V or more	Yes	Inspect for ground condition of the magnetic clutch on the A/C compressor. • If the ground condition has a malfunction: ― Repair or replace the ground condition. • If the ground condition is normal: ― Inspect the magnetic clutch coil for open circuit. ― Repair or replace the magnetic clutch coil, if necessary.
2		No	Go to the next step.
3	Disconnect the refrigerant pressure switch connector. Connect a jumper wire between A/C high-pressure switch terminals. Connect a jumper wires between refrigerant pressure switch terminals. Connect the M-MDS to the DLC-2. Perform the PID/DATA Monitor and Record Procedure and access the AC_REQ PID. (See ON-BOARD DIAGNOSTIC TEST [ZJ, ZY].) 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. (See REFRIGERANT PRESSURE SWITCH INSPECTION [MANUAL AIR CONDITIONER].) (See REFRIGERANT PRESSURE SWITCH INSPECTION [FULL-AUTO AIR CONDITIONER].) • If the refrigerant pressure switch has a malfunction: ― Replace the refrigerant pressure switch. (See REFRIGERANT PRESSURE SWITCH REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].) (See REFRIGERANT PRESSURE SWITCH REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) • If the refrigerant pressure switch is normal: ― Go to the next step.
3		No	Inspect the following: • A/C switch is stuck open • Evaporator temperature sensor and A/C amplifier • Open circuit in wiring harness between refrigerant pressure switch and PCM terminal 1AO • Open circuit of blower motor fan switch and resistor (if blower motor does not operate) Repair or replace the malfunctioning part according to the inspection results.
4	Remove a jumper wire from the refrigerant pressure 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 the A/C relay for stuck open. Replace the A/C relay, if necessary.
4		No	Inspect the following: • Refrigerant charging amount • A/C compressor for being seized Repair or replace the malfunctioning part according to the inspection results.
5	Verify test results. • If normal, return to diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [ZJ, ZY].) • If malfunction remains, inspect related Service information perform repair or diagnosis. ― If vehicle repaired, troubleshooting completed. ― If vehicle not repaired or additional diagnostic information not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [ZJ, ZY].)