COOLING FAN SYSTEM Cooling Fan Circuit

DTC Code DTC Name
Cooling Fan Circuit

DESCRIPTION

The ECM turn on or off the FAN NO. 1 relay using signals calculated from the engine coolant temperature, air conditioning, air conditioner refrigerant pressure, engine speed and vehicle speed signals.

WIRING DIAGRAM

Refer to the System Diagram.

Click hereClick here

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. PERFORM ACTIVE TEST USING GTS (CONTROL THE ELECTRIC COOLING FAN)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Electric Cooling Fan.

    5. Check the operation of the cooling fan while operating it using the GTS.

      Powertrain > Engine and ECT > Active Test

      Tester Display

      Control the Electric Cooling Fan

      OK

      GTS Operation

      Fan Operation

      ON

      Cooling fan operates

      OFF

      Cooling fan stops

    Result

    Result

    Proceed to

    OK

    A

    NG (Cooling fan does not operate)

    B

    NG (Cooling fan does not stop)

    C
    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    C

    CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY - ECM)Click here

    B

  2. INSPECT COOLING FAN MOTOR

    1. Inspect the cooling fan motor.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE COOLING FAN MOTOR

    Click here

    OK

  3. CHECK TERMINAL VOLTAGE (FANH VOLTAGE)

    1. A325509C01

      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the A34 ECM connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A34-23 (FANH) - Body ground

      Ignition switch ON

      11 to 14 V

    4. Reconnect the A34 ECM connector.

    Result

    Proceed to

    OK

    NG
    NG

    CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY - ECM)Click here

    OK

  4. CHECK TERMINAL VOLTAGE (FAN NO. 1 RELAY)

    1. A325492C01

      *1

      No. 2 Engine Room Relay Block

      *2

      FAN NO. 1 Relay

      *a

      Normal Spec

      *b

      Tropic Spec

      Remove the FAN NO. 1 relay from the No. 2 engine room relay block.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      3 (FAN NO. 1 relay) - Body ground

      Always

      11 to 14 V

    3. Reinstall the FAN NO. 1 relay.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 1 RELAY - BATTERY)

    OK

  5. CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY - COOLING FAN MOTOR)

    1. Remove the FAN NO. 1 relay from the No. 2 engine room relay block.

    2. Disconnect the A48 cooling fan motor connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      5 (FAN NO. 1 relay) - A48-2

      Always

      Below 1 Ω

      5 (FAN NO. 1 relay) or A48-2 - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the A48 cooling fan motor connector.

    5. Reinstall the FAN NO. 1 relay.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR - BODY GROUND)

    1. Disconnect the A48 cooling fan motor connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A48-1 - Body ground

      Always

      Below 1 Ω

    3. Reconnect the A48 cooling fan motor connector.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT FAN NO. 1 RELAY

    1. Inspect the FAN NO. 1 relay.

      Click here

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ECM

    Click hereClick here

    NG

    REPLACE FAN NO. 1 RELAY

  8. CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY - ECM)

    1. Remove the FAN NO. 1 relay from the No. 2 engine room relay block.

    2. Disconnect the A34 ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 (FAN NO. 1 relay) - A34-23 (FANH)

      Always

      Below 1 Ω

      1 (FAN NO. 1 relay) or A34-23 (FANH) - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the A34 ECM connector.

    5. Reinstall the FAN NO. 1 relay.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT FAN NO. 1 RELAY

    1. Inspect the FAN NO. 1 relay.

      Click here

    Result

    Result

    Proceed to

    OK (w/ Entry and Start System)

    A

    OK (w/o Entry and Start System)

    B

    NG

    C
    B

    CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY - IGNITION OR STARTER SWITCH ASSEMBLY)Click here

    C

    REPLACE FAN NO. 1 RELAY

    A

  10. CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY - IG1 RELAY)

    1. Remove the FAN NO. 1 relay from the No. 2 engine room relay block.

    2. Remove the IG1 relay from the center relay block.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      2 (FAN NO. 1 relay) - 5 (IG1 relay)

      Always

      Below 1 Ω

      2 (FAN NO. 1 relay) or 5 (IG1 relay) - Body ground

      Always

      10 kΩ or higher

    4. Reinstall the IG1 relay.

    5. Reinstall the FAN NO. 1 relay.

    Result

    Proceed to

    OK

    NG
    OK

    CHECK POWER SOURCE CIRCUIT (IG1 RELAY CIRCUIT)

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY - ECM)

    1. Remove the FAN NO. 1 relay from the No. 2 engine room relay block.

    2. Disconnect the A34 ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 (FAN NO. 1 relay) or A34-23 (FANH) - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the A34 ECM connector.

    5. Reinstall the FAN NO. 1 relay.

    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

  12. CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY - IGNITION OR STARTER SWITCH ASSEMBLY)

    1. Remove the FAN NO. 1 relay from the No. 2 engine room relay block.

    2. Disconnect the E21 ignition or starter switch assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      2 (FAN NO. 1 relay) - E21-1 (IG1)

      Always

      Below 1 Ω

      2 (FAN NO. 1 relay) or E21-1 (IG1) - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the E21 ignition or starter switch assembly connector.

    5. Reinstall the FAN NO. 1 relay.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

    1. Inspect the ignition or starter switch assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION OR STARTER SWITCH ASSEMBLY)

    NG

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY

    Click here