AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit

DTC Code DTC Name
Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

When the A/C switch of the air conditioning control assembly is turned on, an A/C on signal is sent to the ECM. The ECM then turns on the MG CLUTCH relay to operate the compressor with magnet clutch.

WIRING DIAGRAM

E293863E01

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (MG CLUTCH RELAY - POWER SOURCE)

    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      1 (MG CLUTCH relay) - Body ground

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

      5 (MG CLUTCH relay) - Body ground

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    INSPECT HTR RELAYClick here

    OK

  2. INSPECT MG CLUTCH RELAY

    1. Inspect the MG CLUTCH relay.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE MG CLUTCH RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (MG CLUTCH RELAY - COMPRESSOR WITH MAGNET CLUTCH)

    1. Disconnect the B1 compressor with magnet clutch connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3 (MG CLUTCH relay) - B1-2 (MG+)

      Always

      Below 1 Ω

      3 (MG CLUTCH relay) or B1-2 (MG+) - Other terminals and body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (MG CLUTCH RELAY - ECM)

    1. Disconnect the A34 ECM connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      2 (MG CLUTCH relay) - A34-35 (MGC)

      Always

      Below 1 Ω

      2 (MG CLUTCH relay) or A34-35 (MGC) - Other terminals and body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT COMPRESSOR WITH MAGNET CLUTCH

    1. Inspect the compressor with magnet clutch.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE COMPRESSOR WITH MAGNET CLUTCH

    Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (PRESSURE SWITCH - ECM)

    1. Disconnect the A33 pressure switch connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A33-2 (CUT-) - A34-10 (AC1)

      Always

      Below 1 Ω

      A33-2 (CUT-) or A34-10 (AC1) - Other terminals and body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - PRESSURE SWITCH)

    1. Disconnect the E54 air conditioning control assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E54-9 (A/C) - A33-1 (CUT+)

      Always

      Below 1 Ω

      E54-9 (A/C) or A33-1 (CUT+) - Other terminals and body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE PRESSURE SWITCH

    1. Replace the pressure switch.

      Tip:

      Since the pressure switch cannot be inspected while it is removed from the vehicle, replace the pressure switch with a new or known good one and check that the condition returns to normal.

      OK

      Malfunction disappears.

    Result

    Proceed to

    OK

    NG
    OK

    END (PRESSURE SWITCH WAS DEFECTIVE)

    NG

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

  9. INSPECT HTR RELAY

    1. Inspect the HTR relay.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE HTR RELAY

    OK

  10. CHECK HARNESS AND CONNECTOR (HTR RELAY - POWER SOURCE AND BODY GROUND)

    1. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      5 (HTR relay) - Body ground

      Always

      11 to 14 V

      1 (HTR relay) - Body ground

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      2 (HTR relay) - Body ground

      Always

      Below 1 Ω

      4 (HTR relay) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (MG CLUTCH RELAY - HTR RELAY)

    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 (MG CLUTCH relay) - 3 (HTR relay)

      Always

      Below 1 Ω

      1 (MG CLUTCH relay) or 3 (HTR relay) - Other terminals and body ground

      Always

      10 kΩ or higher

      5 (MG CLUTCH relay) - 3 (HTR relay)

      Always

      Below 1 Ω

      5 (MG CLUTCH relay) or 3 (HTR relay) - Other terminals and body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR