Inspection Procedure 22: A/C switch system






OPERATION



FUNCTION



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Perform voltage measurement at D-245 engine-ECU <M/T> connector or D-216 engine-A/T-ECU <A/T> connector.

  • Measure engine-ECU <M/T> or engine-A/T-ECU <A/T> terminal voltage.
  • 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
  • Voltage between terminal No. 69 and earth.
OK:
    System voltage (when A/C is ON)
    0.5 V or less (when A/C is OFF)

Q. Is the check result normal?
Go to Step 2 .
Check A/C system (Refer to GROUP 55 - Troubleshooting - Check Chart for Trouble Symptoms ).

STEP 2. Connector check: D-245 engine-ECU <M/T> connector or D-216 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?
Go to Step 3 .
Repair or replace the connector.

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

  • Item 76: A/C switch

    1. Engine: Idling
    2. A/C set temperature:

        3. 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?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.