NO.35 INEFFECTIVE OPERATION OF A/C DURING ENGINE STOP (i-stop system) [MZR 2.0 DISI i-stop]
id0103d3334000
35 |
INEFFECTIVE OPERATION OF A/C DURING ENGINE STOP (i-stop SYSTEM) |
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DESCRIPTION
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• A/C airflow temperature gradually increases or decreases while i-stop function is operating.
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POSSIBLE CAUSE
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A/C system malfunction
• Climate control unit falsely recognizes MAX HOT or MAX COLD of air mix door on driver-side
• Airflow temperature cannot be determined correctly.
• Cabin temperature of target vehicle cannot be calculated.
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Diagnostic procedure
STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Retrieve the PCM, instrument cluster and climate control unit (full-auto air conditioner) DTCs using the M-MDS.
Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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Go to the next step.
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2
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Does the malfunction occur only while the i-stop function is operating (engine stopped)?
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Yes
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Go to the next step.
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No
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Go to the applicable A/C malfunction diagnostic procedure.
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3
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Access the climate control unit PID CABIN TEMP using the M-MDS.
Does the CABIN TEMP PID value indicate the actual cabin temperature of the vehicle?
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Yes
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Go to Step 5.
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No
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Go to the next step.
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4
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Inspect the cabin temperature sensor.
Is there any malfunction?
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Yes
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Replace the cabin temperature sensor.
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No
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Repair or replace the wiring harness between cabin temperature sensor terminal D and climate control unit terminal 2M.
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5
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Access the climate control unit PID SOLAR_SSR_R using the M-MDS.
Does the SOLAR_SSR_R PID value indicate the actual cabin temperature of the vehicle?
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Yes
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Go to Step 7.
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No
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Go to the next step.
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6
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Inspect the solar radiation sensor.
Is there any malfunction?
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Yes
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Replace the solar radiation sensor.
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No
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Repair or replace the wiring harness between solar radiation sensor terminal B and climate control unit terminal 1F.
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7
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Measure the voltage at the climate control unit terminal 1G when the driver-side temperature setting is MAX HOT and MAX COLD.
Is the voltage normal?
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Yes
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Go to Step 9.
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No
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Go to the next step.
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8
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Inspect the driver-side air mix actuator.
Is there any malfunction?
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Yes
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Replace the driver-side air mix actuator.
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No
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Inspect the air mix actuator and linkage for sticking.
Repair or replace the malfunctioning part according to the inspection results.
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9
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Measure the voltage at the climate control unit terminal 1O while the engine is stopped via i-stop control.
Do the elapsed time and voltage values change?
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Yes
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Go to Step 11.
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No
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Go to the next step.
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10
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Inspect the heater core temperature sensor.
Is there any malfunction?
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Yes
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Replace the heater core temperature sensor.
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No
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Repair or replace the wiring harness between heater core temperature sensor terminal B and PCM terminal 1O.
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11
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Measure the voltage at the BCM terminal 1X.
Is the voltage normal?
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Yes
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The system is normal.
• Effect is due to a possible change in the vehicle environment while the engine is stopped (change in solar radiation).
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No
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Go to the next step.
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12
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Inspect the ambient temperature sensor.
Is there any malfunction?
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Yes
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Replace the ambient temperature sensor.
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No
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Inspect the wiring harness between the following terminals:
• Ambient temperature sensor terminal A—BCM 1X
• Ambient temperature sensor terminal B—BCM 1H
Repair or replace the suspected wiring harness.
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13
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Verify the test results.
• If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZR 2.0 DISI i-stop].)
• If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
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