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NO.25 A/C DOES NOT WORK SUFFICIENTLY [MZR-CD (RF Turbo)]

id0103f1822300

25 | A/C DOES NOT WORK SUFFICIENTLY
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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
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1 | Perform the self-test function using the WDS or equivalent. Turn the engine switch to the ON position. Retrieve any DTCs. Are any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE [MZR-CD (RF Turbo)].) Communication error message is displayed: Inspect the following: • Open circuit between PCM control relay and PCM terminal 119 or 120 • Open circuit PCM control relay and PCM terminal 105 • PCM control relay stuck open • Open or poor ground circuit (PCM terminal 1, 2, 3, 114 or 117) • Poor connection to vehicle body ground
Yes | No DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE [MZR-CD (RF Turbo)].)
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.
No | Go to the next step.
3 | Disconnect the refrigerant pressure switch connector. Connect jumper wire between terminals of refrigerant pressure switch connector. Turn the engine switch to the ON position. Turn the A/C switch on and set the blower fan at any speed. Measure the PCM terminal 32 voltage. Is the voltage b elow 1.0 V? | Yes | Inspect refrigerant pressure switch operation. If switch is normal, go to the next step.
No | Inspect the following: • A/C switch is stuck open • Open circuit between refrigerant pressure switch and PCM terminal 32 • 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.
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 fan operate? | Yes | Inspect for a stuck open A/C relay. Replace if necessary.
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 [MZR-CD (RF Turbo)].) • 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.