COOLING FAN SYSTEM Cooling Fan Circuit

DESCRIPTION

To control the cooling fans, the ECM turns the cooling fan relays on or off based on the engine coolant temperature, air conditioning switch, refrigerant pressure, engine speed and vehicle speed signals.

The ECM turns the fan relays on or off to switch the cooling fan motor circuit between the series circuit and parallel circuit, controlling the cooling fan motor speed in 2 steps.

WIRING DIAGRAM

A00DRHPE02
A00DQGCE02

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE ELECTRIC COOLING FAN)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

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

      OK
      Tester Operation Specified Condition
      ON Cooling fans operate
      OFF Cooling fans stop

    NG
    OK
  2. CHECK HARNESS AND CONNECTOR (FANL AND FANH VOLTAGE)


    1. A00DRWAE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A40-22 (FANH) - Body ground Engine switch on (IG) 11 to 14 V
      A40-21 (FANL) - Body ground Engine switch on (IG) 11 to 14 V
    4. Reconnect the ECM connector.


    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY AND FAN NO. 3 RELAY VOLTAGE)


    1. A00DQ8ME01
      Text in Illustration
      *1 FAN NO. 3 Relay
      *2 FAN NO. 1 Relay
      *3 Engine Room No. 1 Relay Block

      Remove the FAN NO. 1 relay and FAN NO. 3 relay from the engine room No. 1 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
      5 (FAN NO. 3 relay) - Body ground Always 11 to 14 V
    3. Reinstall the FAN NO. 1 relay and FAN NO. 3 relay.


    NG
    OK
  4. INSPECT FAN NO. 1 RELAY


    1. A00DUGTE50

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

    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. Reinstall the FAN NO. 1 relay.


    NG
    OK
  5. INSPECT FAN NO. 2 RELAY


    1. A00DSI1E01

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      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
      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. Reinstall the FAN NO. 2 relay.


    NG
    OK
  6. INSPECT FAN NO. 3 RELAY


    1. A00DUGTE50

      Remove the FAN NO. 3 relay from the engine room No. 1 relay block.

    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. Reinstall the FAN NO. 3 relay.


    NG
    OK
  7. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK - BODY GROUND)


    1. A00DRFZE01
      Text in Illustration
      *1 FAN NO. 2 relay
      *2 Engine Room No. 1 Relay Block

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5 (FAN NO. 2 relay) - Body ground Always Below 1 Ω
    3. Reinstall the FAN NO. 2 relay.


    NG
    OK
  8. INSPECT NO. 1 COOLING FAN MOTOR


    1. Inspect the No. 1 cooling fan motor Click here.


    NG
    OK
  9. CHECK HARNESS AND CONNECTOR (NO. 1 COOLING FAN MOTOR - BODY GROUND)


    1. A00DRZHE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 1 Cooling Fan Motor)

      Disconnect the No. 1 cooling fan motor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A47-1 - Body ground Always Below 1 Ω
    3. Reconnect the No. 1 cooling fan motor connector.


    NG
    OK
  10. CHECK HARNESS AND CONNECTOR (NO. 1 COOLING FAN MOTOR - ENGINE ROOM NO. 1 RELAY BLOCK)


    1. A00DUL3E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 1 Cooling Fan Motor)

      *2 FAN NO. 2 Relay
      *3 FAN NO. 1 Relay
      *4 Engine Room No. 1 Relay Block

      Disconnect the No. 1 cooling fan motor connector.

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

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A47-2 - 5 (FAN NO. 1 relay) Always Below 1 Ω
      A47-2 - 4 (FAN NO. 2 relay) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A47-2 or 5 (FAN NO. 1 relay) - Body ground Always 10 kΩ or higher
      A47-2 or 4 (FAN NO. 2 relay) - Body ground Always 10 kΩ or higher
    4. Reconnect the No. 1 cooling fan motor connector.

    5. Reinstall the FAN NO. 1 relay and FAN NO. 2 relay.


    NG
    OK
  11. INSPECT NO. 2 COOLING FAN MOTOR


    1. Inspect the No. 2 cooling fan motor Click here.


    NG
    OK
  12. CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN MOTOR - ENGINE ROOM NO. 1 RELAY BLOCK)


    1. A00DR1FE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 2 Cooling Fan Motor)

      *2 FAN NO. 2 Relay
      *3 FAN NO. 3 Relay
      *4 Engine Room No. 1 Relay Block

      Disconnect the No. 2 cooling fan motor connector.

    2. Remove the FAN NO. 2 relay and FAN NO. 3 relay from the engine room No. 1 relay block.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A48-1 - 3 (FAN NO. 2 relay) Always Below 1 Ω
      A48-2 - 3 (FAN NO. 3 relay) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A48-1 or 3 (FAN NO. 2 relay) - Body ground Always 10 kΩ or higher
      A48-2 or 3 (FAN NO. 3 relay) - Body ground Always 10 kΩ or higher
    4. Reconnect the No. 2 cooling fan motor connector.

    5. Reinstall the FAN NO. 2 relay and FAN NO. 3 relay.


    NG
    OK
  13. INSPECT ENGINE ROOM NO. 1 RELAY BLOCK (FAN NO. 1 RELAY - FAN NO. 2 RELAY)


    1. A00DT7EE01
      Text in Illustration
      *1 FAN NO. 2 Relay
      *2 FAN NO. 1 Relay
      *3 Engine Room No. 1 Relay Block

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

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      1 (FAN NO. 1 relay) - 1 (FAN NO. 2 relay) Always Below 1 Ω
      2 (FAN NO. 1 relay) - 2 (FAN NO. 2 relay) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      1 (FAN NO. 1 relay) or 1 (FAN NO. 2 relay) - Body ground Always 10 kΩ or higher
      2 (FAN NO. 1 relay) or 2 (FAN NO. 2 relay) - Body ground Always 10 kΩ or higher
    3. Reinstall the FAN NO. 1 relay and FAN NO. 2 relay.


    NG
    OK
  14. INSPECT FAN NO. 1 RELAY


    1. A00DUGTE50

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

    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. Reinstall the FAN NO. 1 relay.


    NG
    OK
  15. INSPECT FAN NO. 2 RELAY


    1. A00DSI1E01

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      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
      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. Reinstall the FAN NO. 2 relay.


    NG
    OK
  16. INSPECT FAN NO. 3 RELAY


    1. A00DUGTE50

      Remove the FAN NO. 3 relay from the engine room No. 1 relay block.

    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. Reinstall the FAN NO. 3 relay.


    NG
    OK
  17. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK - ECM)


    1. A00DV1HE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

      *2 FAN NO. 2 Relay
      *3 FAN NO. 3 Relay
      *4 FAN NO. 1 Relay
      *5 Engine Room No. 1 Relay Block

      Remove the FAN NO. 1 relay, FAN NO. 2 relay and FAN NO. 3 relay from the engine room No. 1 relay block.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      2 (FAN NO. 1 relay) - A40-22 (FANH) Always Below 1 Ω
      2 (FAN NO. 2 relay) - A40-22 (FANH) Always Below 1 Ω
      2 (FAN NO. 3 relay) - A40-21 (FANL) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      2 (FAN NO. 1 relay) or A40-22 (FANH) - Body ground Always 10 kΩ or higher
      2 (FAN NO. 2 relay) or A40-22 (FANH) - Body ground Always 10 kΩ or higher
      2 (FAN NO. 3 relay) or A40-21 (FANL) - Body ground Always 10 kΩ or higher
    4. Reinstall the FAN NO. 1 relay, FAN NO. 2 relay and FAN NO. 3 relay.

    5. Reconnect the ECM connector.


    NG
    OK
  18. CHECK HARNESS AND CONNECTOR (FAN RELAY VOLTAGE)


    1. A00DV3BE01
      Text in Illustration
      *1 FAN NO. 2 Relay
      *2 FAN NO. 3 Relay
      *3 FAN NO. 1 Relay
      *4 Engine Room No. 1 Relay Block

      Remove the FAN NO. 1 relay, FAN NO. 2 relay and FAN NO. 3 relay from the engine room No. 1 relay block.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      1 (FAN NO. 1 relay) - Body ground Engine switch on (IG) 11 to 14 V
      1 (FAN NO. 2 relay) - Body ground Engine switch on (IG) 11 to 14 V
      1 (FAN NO. 3 relay) - Body ground Engine switch on (IG) 11 to 14 V
    4. Reinstall the FAN NO. 1 relay, FAN NO. 2 relay and FAN NO. 3 relay.


    NG
    OK