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Home >> Toyota >> 2009 >> Corolla S, 1.8 L, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Cooling System (2AZ-FE)) >> Cooling Fan System >> Cooling Fan Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different variant/trim than selected.
NOTE: After replacing the ECM, the new ECM needs registration (See REGISTRATION ).
  1. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE ELECTRIC COOLING FAN) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Electric Cooling Fan.

      OK 

      ACTIVE TEST REFERENCE

      Tester Operation Specified Condition
      ON Fans operate
      OFF Fans do not operate

      Result 

      RESULT REFERENCE

      Result Proceed to
      OK A
      N6 (Cooling fans do not operate) B
      NG (Cooling fans do not stop) C

      B: Go to step 2 

      C: Go to step  20

      A: PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE 

  2. INSPECT ECM (FANL AND FANH VOLTAGE) 
    1. Disconnect the ECM connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      A50-21 (FANL) - Body ground Ignition switch ON 11 to 14 V
      A50-22 (FANH) - Body ground Ignition switch ON 11 to 14 V
    4. Reconnect the ECM connector.

      NG: Go to step  14

      Fig 1: Identifying A50 ECM Connector
      G06009264Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to Next Step 

  3. INSPECT ENGINE ROOM RELAY BLOCK (FAN NO. 1 RELAY AND FAN NO. 3 RELAY VOLTAGE) 
    1. Remove the FAN No. 1 relay and FAN No. 3 relay from the engine room relay block.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      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: REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ENGINE ROOM RELAY BLOCK) 

      Fig 2: Identifying FAN No. 1 And 3 Relay
      G06009265Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to Next Step 

  4. INSPECT FAN NO. 1 RELAY 
    1. Inspect the FAN No. 1 relay (See RELAY ).

      NG: REPLACE FAN NO. 1 RELAY 

      OK: Go to Next Step 

  5. INSPECT FAN NO. 2 RELAY 
    1. Inspect the FAN No. 2 relay (See RELAY ).

      NG: REPLACE FAN NO. 2 RELAY 

      OK: Go to Next Step 

  6. INSPECT FAN NO. 3 RELAY 
    1. Inspect the FAN No. 3 relay (See RELAY ).

    NG: REPLACE FAN NO. 3 RELAY 

    OK: Go to Next Step 

  7. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - BODY GROUND) 
    1. Remove the FAN No. 2 relay from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

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

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM RELAY BLOCK - BODY GROUND) 

      Fig 3: Identifying FAN No. 2 Relay
      G06009266Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSPECT NO. 1 COOLING FAN MOTOR (RADIATOR FAN MOTOR) 
    1. Inspect the No. 1 cooling fan motor (See ON-VEHICLE INSPECTION ).

      NG: REPLACE NO. 1 COOLING FAN MOTOR (RADIATOR FAN MOTOR)  (See COOLING FAN MOTOR )

      OK: Go to Next Step 

  9. CHECK HARNESS AND CONNECTOR (NO. 1 COOLING FAN MOTOR - BODY GROUND) 
    1. Disconnect the No. 1 cooling fan motor (radiator fan motor) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A58-1 - Body ground Always Below 1 Ω
    3. Reconnect the No. 1 cooling fan motor connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 COOLING FAN MOTOR - BODY GROUND) 

      Fig 4: Identifying A58 No. 1 Cooling Fan Motor Connector
      G06009267Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to Next Step 

  10. CHECK HARNESS AND CONNECTOR (NO. 1 COOLING FAN MOTOR - ENGINE ROOM RELAY BLOCK) 
    1. Disconnect the No. 1 cooling fan motor (radiator fan motor) connector.
    2. Remove the FAN No. 1 relay and FAN No. 2 relay from the engine room relay block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open) 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A58-2 - 5 (FAN No. 1 relay) Always Below 1 Ω
      A58-2 - 4 (FAN No. 2 relay) Always Below 1 Ω

      Standard Resistance (Check for Short) 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A58-2 or 5 (FAN No. 1 relay) - Body ground Always 10 kΩ or higher
      A58-2 or 4 (FAN No. 2 relay) - Body ground Always 10 kΩ or higher
    4. Reconnect the radiator fan motor connector.
    5. Reinstall the FAN No. 1 relay and FAN No. 2 relay.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 COOLING FAN MOTOR - ENGINE ROOM RELAY BLOCK) 

      Fig 5: Identifying A58 No. 1 Cooling Fan Motor Connector And FAN No. 1 And 2 Relay
      G06009268Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to Next Step 

  11. INSPECT NO. 2 COOLING FAN MOTOR (AIR CONDITIONER CONDENSER FAN MOTOR) 
    1. Inspect the No. 2 cooling fan motor (See ON-VEHICLE INSPECTION ).

      NG: REPLACE NO. 2 COOLING FAN MOTOR (AIR CONDITIONER CONDENSER FAN MOTOR)  (See COOLING FAN MOTOR )

      OK: Go to Next Step 

  12. CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN MOTOR - ENGINE ROOM RELAY BLOCK) 
    1. Disconnect the No. 2 cooling fan motor (air conditioner condenser fan motor) connector.
    2. Remove the FAN No. 2 relay and FAN No. 3 relay from the engine room relay block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open) 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A59-1 - 3 (FAN No. 2 relay) Always Below 1 Ω
      A59-2 - 3 (FAN No. 3 relay) Always Below 1 Ω

      Standard Resistance (Check for Short) 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A59-1 or 3 (FAN No. 2 relay) - Body ground Always 10 kΩ or higher
      A59-2 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: REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 COOLING FAN MOTOR - ENGINE ROOM RELAY BLOCK) 

      Fig 6: Identifying No. 2 Cooling Fan Motor Connector And FAN No. 2 And 3 Relay
      G06009269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to Next Step 

  13. INSPECT ENGINE ROOM RELAY BLOCK (FAN NO. 1 RELAY - FAN NO. 2 RELAY) 
    1. Remove the FAN No. 1 relay and FAN No. 2 relay from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open) 

      STANDARD RESISTANCE SPECIFICATION

      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) 

      STANDARD RESISTANCE SPECIFICATION

      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: REPLACE ENGINE ROOM RELAY BLOCK 

      Fig 7: Identifying FAN No. 1 And 2 Relay
      G06009270Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE ECM  (See ECM )

  14. CHECK FUSE (ECU-IG NO. 1 FUSE) 
    1. Remove the ECU-IG No. 1 fuse from the instrument panel junction block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      ECU-IG No. 1 fuse Always Below 1 Ω
    3. Reinstall the ECU-IG No. 1 fuse.

      NG: REPLACE FUSE (ECU-IG NO. 1 FUSE) 

      Fig 8: Identifying ECU-IG No. 1 Fuse
      G06009271Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to Next Step 

  15. INSPECT FAN NO. 1 RELAY 
    1. Inspect the FAN No. 1 relay (See RELAY ).

      NG: REPLACE FAN NO. 1 RELAY 

      OK: Go to Next Step 

  16. INSPECT FAN NO. 2 RELAY 
    1. Inspect the FAN No. 2 relay (See RELAY ).

      NG: REPLACE FAN NO. 2 RELAY 

      OK: Go to Next Step 

  17. INSPECT FAN NO. 3 RELAY 
    1. Inspect the FAN No. 3 relay (See RELAY ).

      NG: REPLACE FAN NO. 3 RELAY 

      OK: Go to Next Step 

  18. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - ECM) 
    1. Remove the FAN No. 1 relay, FAN No. 2 relay and FAN No. 3 relay from the engine room 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) 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      2 (FAN No. 1 relay) -A50-22 (FANH) Always Below 1 Ω
      2 (FAN No. 2 relay) -A50-22 (FANH) Always Below 1 Ω
      2 (FAN No. 3 relay) -A50-21 (FANL) Always Below 1 Ω
    4. Reinstall the FAN No. 1 relay, FAN No. 2 relay and FAN No. 3 relay.
    5. Reconnect the ECM connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM RELAY BLOCK - ECM) 

      Fig 9: Identifying Fan No. 1, 2 And 3 With A50 ECM Connector
      G06009272Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to Next Step 

  19. CHECK HARNESS AND CONNECTOR (ECU-IG NO. 1 FUSE - ENGINE ROOM RELAY BLOCK) 
    1. Remove the FAN No. 1 relay, FAN No. 2 relay and FAN No. 3 relay from the engine room relay block.
      Fig 10: Identifying FAN No. 1, 2 And 3 Relay
      G06009273Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the ECU-IG No. 1 fuse from the instrument panel junction block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open) 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      1 (FAN No. 1 relay)-2 (ECU-I6 No. 1 fuse) Always Below 1 Ω
      1 (FAN No. 2 relay) - 2 (ECU-IG No. 1 fuse) Always Below 1 Ω
      1 (FAN No. 3 relay) - 2 (ECU-IG No. 1 fuse) Always Below 1 Ω

      Standard Resistance (Check for Short) 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      1 (FAN No. 1 relay) or 2 (ECU-IG No. 1 fuse) -Body ground Always 10 kΩ or higher
      1 (FAN No. 2 relay) or 2 (ECU-IG No. 1 fuse) -Body ground Always 10 kΩ or higher
      1 (FAN No. 3 relay) or 2 (ECU-IG No. 1 fuse) -Body ground Always 10 kΩ or higher
    4. Reinstall the FAN No. 1 relay, FAN No. 2 relay and FAN No. 3 relay.
    5. Reinstall the ECU-IG No. 1 fuse.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (ECU-IG NO. 1 FUSE - ENGINE ROOM RELAY BLOCK) 

      Fig 11: Identifying ECU-IG No. 1 Fuse
      G06009274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS )

  20. INSPECT FAN NO. 1 RELAY 
    1. Inspect the FAN No. 1 relay (See RELAY ).

      NG: REPLACE FAN NO. 1 RELAY 

      OK: Go to Next Step 

  21. INSPECT FAN NO. 3 RELAY 
    1. Inspect the FAN No. 3 relay (See RELAY ).

      NG: REPLACE FAN NO. 3 RELAY 

      OK: Go to Next Step 

  22. CHECK HARNESS AND CONNECTOR 
    1. Remove the FAN No. 1 relay, FAN No. 2 relay and FAN No. 3 relay from the engine room relay block.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Short) 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      2 (FAN No. 1 relay) or A50-22 (FANH) - Body ground Always 10 kΩ or higher
      2 (FAN No. 2 relay) or A50-22 (FANH) - Body ground Always 10 kΩ or higher
      2 (FAN No. 3 relay) or A50-21 (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: REPAIR OR REPLACE HARNESS OR CONNECTOR (ECU-IG NO. 1 FUSE - ENGINE ROOM RELAY BLOCK) 

      Fig 12: Identifying Fan No. 1, 2 And 3 With A50 ECM Connector
      G06009272Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE ECM  (See ECM )

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