STEP 1. MUT-II/III diagnosis code

Q: Diagnosis code set?

YES:  Inspection chart for diagnosis code (Refer to ).
NO:  Go to Step 2 .

STEP 2. A/C compressor magnet clutch operation check.

• Engine: Idling

• A/C set temperature:

• Maximum Cool when temperature in cabin is 25°C or more
• Maximum Hot when temperature in cabin is 25°C or less

OK:

• Magnet clutch active (when A/C is ON)

• Magnet clutch inactive (when A/C is OFF)

Q: Is the check result normal?

YES:  Go to Step 5 .
NO:  Go to Step 3 .

STEP 3. MUT-II/III data list

• Item 28: A/C switch

1. Engine: Idling
2. A/C set temperature:
• Maximum Cool when temperature in cabin is 25°C or more
• Maximum Hot when temperature in cabin is 25°C or less

OK:

• ON (when A/C is ON)

• OFF (when A/C is OFF)

Q: Is the check result normal?

YES:  Go to Step 4 .
NO:  Check A/C switch (Refer to Inspection Procedure 27 ).

STEP 4. MUT-II/III data list

• Item 49: A/C relay

1. Engine: Running at idle
2. A/C set temperature:
• Maximum Cool when temperature in cabin is 25°C or more.
• Maximum Hot when temperature in cabin is 25°C or less.

OK:

• ON (when A/C is ON)

• OFF (when A/C is OFF)

Q: Is the check result normal?

YES:  Check A/C system (Refer to GROUP 55A - Troubleshooting check chart for trouble symptoms ).
NO:  Check A/C compressor relay (Refer to Inspection Procedure 27 ).

STEP 5. Check charged amount of A/C refrigerant.

• Check charged amount of A/C refrigerant (Refer to GROUP 55A - On-vehicle Service - Sight Glass Refrigerant Level Test ).

YES:  Go to Step 6 .
NO:  Adjust charged amount of A/C refrigerant.

STEP 6. MUT-II/III actuator test

• Item 21: Fan controller

OK: Fan motor rotates.

Q: Is the check result normal?

YES:  Check A/C load signal system (Refer to Inspection Procedure 28 ).
NO:  Check fan control relay system (Refer to Inspection Procedure 25 ).