Inspection Procedure 21: Poor A/C Performance


COMMENT ON TROUBLE SYMPTOM



PROBABLE CAUSE



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q. Is diagnosis code set?
Inspection chart for diagnosis code (Refer to ).
Go to Step 2 .

STEP 2. Check A/C compressor magnetic clutch operation.

  • Engine: Idling
  • A/C set temperature:

      • Maximum Cool when temperature in cabin is 25°C or higher
      Maximum Hot when temperature in cabin is 25°C or lower
OK:
    Magnetic clutch active (when A/C is ON).
    Magnetic clutch inactive (when A/C is OFF).

Q. Is the check result normal?

Go to Step 4 .
Go to Step 3 .

STEP 3. M.U.T.-III data list

  1. Item 49: A/C relay

    • Engine: Idling
    • A/C set temperature:

        • Maximum Cool when temperature in cabin is 25°C or higher.
        Maximum Hot when temperature in cabin is 25°C or lower.
OK:
    ON (when A/C is ON)
    OFF (when A/C is OFF)

Q. Is the check result normal?
Check A/C system (Refer to GROUP 55 - Troubleshooting check chart for trouble symptoms ).
Check A/C compressor relay (Refer to Inspection Procedure 25 ).

STEP 4. M.U.T.-III actuator test

  1. Item 21: Fan controller
OK: Fan motor rotates.

Q. Is the check result normal?
Check charged amount of A/C refrigerant (Refer to GROUP 55 - On-vehicle Service - Check The Refrigerant Level Test ).
Check fan control relay system (Refer to Inspection Procedure 24 ).