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NO.23 A/C DOES NOT WORK SUFFICIENTLY [MZR-CD (RF Turbo)]

BME010300103294

23 | A/C DOES NOT WORK SUFFICIENTLY
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DESCRIPTION | • A/C compressor magnetic clutch does not engage when 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 GND 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 self-test function using the WDS or equivalent. Turn the engine switch to the ON position. Retrieve any DTC. Is DTC displayed? | Yes | DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].) Communication error message is displayed: Inspect for the following:
• Open circuit between PCM control relay and PCM terminal 53 or 79
• Open circuit PCM control relay and PCM terminal 69
• PCM control relay stuck open
• Open or poor GND circuit (PCM terminal 65, 85, 103 or 104)
• Poor connection vehicle body GND
Yes | No DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
2 | Disconnect the A/C compressor connector. Start the engine and turn the A/C switch on. Is there correct voltage at terminal of the A/C compressor magnetic clutch connector? Specification More than 10.5 V | Yes | Inspect for GND condition of magnetic clutch on the A/C compressor. If GND condition is normal, inspect the magnetic clutch coil for open circuit.
No | Go to the next step.
3 | Disconnect refrigerant pressure switch connector. Connect a jumper wire between terminals of the 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 voltage of PCM terminal 84.
Is the voltage b elow 1.0 V?
Yes
Inspect the refrigerant pressure switch operation.
If the switch is normal, go to the next step.
No | Inspect for the following: • A/C switch is stuck open • Open circuit between refrigerant pressure switch and PCM terminal 84 • 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 a jumper wire from the switch connector. Reconnect connector to the refrigerant pressure switch. Start the engine and turn the A/C switch on. Does the fan operate? | Yes | Inspect for stuck open A/C relay. Replace if necessary.
No | Inspect the following and repair or replace if necessary: • Refrigerant charging amount • Seized A/C compressor
6 | Verify test results. • If normal, return to diagnostic index to service any additional symptoms. • If malfunction remains, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)