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 turnd 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

  1. for 1PP

    E297342E01

  2. for 1KR-FE

    E293863E01

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

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

    1. Remove the MG CLUTCH relay.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      Relay terminal 1 - Body ground

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

      Relay terminal 5 - 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. CONFIRM MODEL

    1. Choose the model to be inspected.

    Result

    Result

    Proceed to

    for 1PP

    A

    for 1KR-FE

    B
    B

    INSPECT MG CLUTCH RELAYClick here

    A

  3. READ OUTPUT DTC (DTC P1543)

    1. Clear the DTCs.

      Click here

      Powertrain > Engine > Clear DTCs

    2. Check for DTCs.

      Click here

      Powertrain > Engine > Trouble Codes

    Result

    Result

    Proceed to

    DTC P1543 is output

    A

    DTC P1543 is not output

    B
    A

    GO TO DTC P1543

    Click here

    B

  4. CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING CONTROL ASSEMBLY)

    1. Disconnect the B56 ECM connector.

    2. Disconnect the E54 air conditioning control assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B56-2 - E54-9 (A/C)

      Always

      Below 1 Ω

      B56-2 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT MG CLUTCH RELAY

    1. E293864C01

      *a

      Component without harness connected

      (MG CLUTCH Relay)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3 - 5

      Battery voltage not applied between terminals 1 and 2

      10 kΩ or higher

      Battery voltage applied between terminals 1 and 2

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE MG CLUTCH RELAY

    OK

  6. 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

      Relay terminal 3 - B1-2 (MG+)

      Always

      Below 1 Ω

      Relay terminal 3 - 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 (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

      Relay terminal 2 - A34-35 (MGC)

      Always

      Below 1 Ω

      Relay terminal 2 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK COMPRESSOR WITH MAGNET CLUTCH

    1. E293865C01

      *a

      Component without harness connected

      (Compressor with Magnet Clutch)

      Connect the compressor with magnet clutch connector.

    2. When connector terminal 2 (MG+) is connected to a positive (+) battery terminal, check that the following occurs: 1) the magnetic clutch operating sound can be heard, and 2) the magnetic clutch hub and rotor lock.

      OK

      The magnetic clutch assembly operating sound can be heard, and the magnetic clutch hub and rotor lock.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE COMPRESSOR WITH MAGNET CLUTCH

    Click hereClick here

    OK

  9. 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

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

      Always

      Below 1 Ω

      A34-10 (AC1) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    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) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. 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 hereClick here

  12. INSPECT HTR RELAY

    1. E032993C04

      *a

      Component without harness connected

      (HTR Relay)

      Remove the HTR relay.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3 - 5

      Battery voltage not applied between terminals 1 and 2

      10 kΩ or higher

      Battery voltage applied between terminals 1 and 2

      Below 1 Ω

      3 - 4

      Battery voltage not applied between terminals 1 and 2

      Below 1 Ω

      Battery voltage applied between terminals 1 and 2

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE HTR RELAY

    OK

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

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      Relay terminal 5 - Body ground

      Always

      11 to 14 V

      Relay terminal 1 - Body ground

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Relay terminal 2 - Body ground

      Always

      Below 1 Ω

      Relay terminal 4 - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. 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

      MG CLUTCH relay terminal 1 - HTR relay terminal 3

      Always

      Below 1 Ω

      MG CLUTCH relay terminal 1 - Body ground

      Always

      10 kΩ or higher

      MG CLUTCH relay terminal 5 - HTR relay terminal 3

      Always

      Below 1 Ω

      MG CLUTCH relay terminal 5 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR