Inspection Procedure 24: A/C switch system






OPERATION



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Perform voltage measurement at D-213 engine-ECU connector.

  • Measure engine-ECU 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. 15 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-213 engine-ECU connector

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

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

  • Item 25: A/C switch

    • 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:
  • 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. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection. (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).