ECD SYSTEM, Diagnostic DTC:P0495, P0691, P0692, P0693, P0694

DTC Code DTC Name
P0495 FAN Consistency Test
P0691 Short to B+ in FAN1 Circuit
P0692 Open or Short to GND in FAN1 Circuit
P0693 Short to B+ in FAN2 Circuit
P0694 Open or Short to GND in FAN2 Circuit

DESCRIPTION



DTC No. DTC Detection Condition Trouble Area Possible to Detect
Ignition Switch Engine Run
P0495 Consistency between calculated speed and actual speed is not detected.

  • Fan No.1 relay (w/o air conditioner)

  • Fan No.1 relay circuit (w/o air conditioner)

  • Cooling fan resistor (w/ air conditioner)

  • Cooling fan resistor circuit (w/ air conditioner)

  • ECM

 ON ON
P0691 Short in fan 1 circuit (Power supply side) for 5 sec. or more.

  • Fan No.1 relay (w/o air conditioner)

  • Fan No.1 relay circuit (w/o air conditioner)

  • Cooling fan resistor (w/ air conditioner)

  • Cooling fan resistor circuit (w/ air conditioner)

  • ECM

 ON ON
P0692 Open or short in fan 1 circuit for 5 sec. or more.

  • Fan No.1 relay (w/o air conditioner)

  • Fan No.1 relay circuit (w/o air conditioner)

  • Cooling fan resistor (w/ air conditioner)

  • Cooling fan resistor circuit (w/ air conditioner)

  • ECM

 ON ON
P0693 Short in fan 2 circuit (Power supply side) for 5 sec. or more.

  • Fan No.1 relay (w/o air conditioner)

  • Fan No.1 relay circuit (w/o air conditioner)

  • Cooling fan resistor (w/ air conditioner)

  • Cooling fan resistor circuit (w/ air conditioner)

  • ECM

 ON ON
P0694 Open or short in fan 2 circuit for 5 sec. or more.

  • Fan No.1 relay (w/o air conditioner)

  • Fan No.1 relay circuit (w/o air conditioner)

  • Cooling fan resistor (w/ air conditioner)

  • Cooling fan resistor circuit (w/ air conditioner)

  • ECM

 ON ON

Tech Tips

Cooling fan control strategy (w/o air conditioner):
Engine coolant temperature Less than 97°C (206.6°F) 97°C (206.6°F) or higher
Cooling fan operation OFF ON
Cooling fan control strategy (w/ air conditioner):
Air conditioning condition Engine coolant temperature
Compressor Refrigerant Pressure 97 to 105°C (206.6 to 221°F) 105°C (221°F) or more
OFF - Low speed High speed
ON Low pressure Low speed High speed
High pressure High speed High speed

  • When engine coolant temperature is 115°C (239°F) or more, the operation of the air conditioner compressor is stopped.

  • When engine coolant temperature is more than 118°C (244.4°F), the warning light comes on.

FAIL-SAFE

DTC No. Fail-safe Operation Fail-safe Deactivation Condition
P0495 Stops the A/C. Normal condition is restored.
P0691 Stops the A/C. Normal condition is restored.
P0692 Stops the A/C. Normal condition is restored.
P0693 Stops the A/C. Normal condition is restored.
P0694 Stops the A/C. Normal condition is restored.

WIRING DIAGRAM

A013843E01
A0138PEE02
A01378ME02

INSPECTION PROCEDURE

Tech Tips


  • If the ECM is replaced, variant coding (variant coding indicates the presence of vehicle accessory items, A/C, etc.) should always be performed Click here.

  • Before removing the ECM and the peripheral parts, wait at least 3 minute after turning the ignition switch off (If the cooling fan is operating, remove the ECM and the peripheral parts after the fan stops.).

PROCEDURE


  1. CHECK IF VEHICLE IS EQUIPPED WITH A/C


    1. Check if the vehicle is equipped with the A/C.

      Result
      Result Proceed To
      w/o A/C A
      w/ A/C B

    B

    PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE FAN) Click here

    A

  2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE FAN)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position and turn the intelligent tester on.

    3. Clear the DTC Click here.

    4. Select the following menu items: Powertrain / Engine and ECT / Active Test / Fan 1.

    5. Check the operation of the fan while operating it using the intelligent tester.

      Standard
      Fan active test Condition
      Activated Fan operates
      Deactivated Fan stops

      Tech Tips

      To check if a voltage is applied to the cooling fan, select the following menu items: Powertrain / Engine and ECT / Data List / Fan Relay.


    NG

    INSPECT ENGINE ROOM R/B (VOLTAGE) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS

  3. INSPECT ENGINE ROOM R/B (VOLTAGE)


    1. A0138AHE01

      Remove the engine room R/B.

    2. Remove the engine room R/B lower cover.

    3. Disconnect the 1D and 1H engine room R/B connectors.

    4. Turn the ignition switch to the ON position.

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

      Standard voltage
      Tester Connection Specified Condition
      Engine room R/B (1D-7) - Body ground 11 to 14 V
      Engine room R/B (1H-1) - Body ground 11 to 14 V

    NG

    CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY - ENGINE ROOM R/B)

    OK

  4. CHECK HARNESS AND CONNECTOR (ENGINE ROOM R/B - ECM)


    1. A01391ME01

      Disconnect the B54 ECM connector.

    2. Remove the engine room R/B.

    3. Remove the engine room R/B lower cover.

    4. Disconnect the 1D and 1E engine room R/B connectors.

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

      Standard resistance
      Check for open
      Tester Connection Specified Condition
      GMV (B54-4) - Engine room R/B (1E-2) Below 1 Ω
      GMV1 (B54-18) - Engine room R/B (1D-6) Below 1 Ω
      Check for short
      Tester Connection Specified Condition
      GMV (B54-4) or Engine room R/B (1E-2) - Body ground 10 kΩ or higher
      GMV1 (B54-18) or Engine room R/B (1D-6) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE ENGINE ROOM R/B (FAN NO.1 RELAY)


    NEXT

  6. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE FAN)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position and turn the intelligent tester on.

    3. Clear the DTC Click here.

    4. Select the following menu items: Powertrain / Engine and ECT / Active Test / Fan 1.

    5. Check the operation of the fan while operating it using the intelligent tester.

      Standard
      Fan active test Condition
      Activated Fan operates
      Deactivated Fan stops

      Tech Tips

      To check if a voltage is applied to the cooling fan, select the following menu items: Powertrain / Engine and ECT / Data List / Fan Relay.


    NG

    REPLACE ECM

    OK

    END

  7. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE FAN)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position and turn the intelligent tester on.

    3. Clear the DTC Click here.

    4. Select the following menu items: Powertrain / Engine and ECT / Active Test / Fan 1 and Fan 2.

    5. Check the operation of the fan while operating it using the intelligent tester.

      Standard
      Fan active test Condition
      Deactivated Fan stops
      Activated (Fan 1) Fan operates
      Activated (Fan 2) Fan operates

    NG

    CHECK HARNESS AND CONNECTOR (COOLING FAN RESISTOR - COOLING FAN MOTOR) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS

  8. CHECK HARNESS AND CONNECTOR (COOLING FAN RESISTOR - COOLING FAN MOTOR)


    1. A0136RIE02

      Disconnect the A34 cooling fan resistor connector.

    2. Disconnect the A39 cooling fan motor connector.

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

      Standard resistance
      Check for open
      Tester Connection Specified Condition
      Cooling fan resistor (A34-2) - Cooling fan motor (A39-2) Below 1 Ω
      Check for short
      Tester Connection Specified Condition
      Cooling fan resistor (A34-2) or Cooling fan motor (A39-2) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT COOLING FAN RESISTOR (VOLTAGE)


    1. A0138VVE01

      Disconnect the A33 and A34 cooling fan resistor connectors.

    2. Turn the ignition switch to the ON position.

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

      Standard voltage
      Tester Connection Specified Condition
      Cooling fan resistor (A33-2) - Body ground 11 to 14 V
      Cooling fan resistor (A34-1) - Body ground 11 to 14 V

    NG

    CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY - COOLING FAN RESISTOR)

    OK

  10. CHECK HARNESS AND CONNECTOR (COOLING FAN RESISTOR - ECM)


    1. A0137R4E01

      Disconnect the A35 (A36) and B54 ECM connectors.

    2. Disconnect the A33 cooling fan resistor connector.

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

      Standard resistance (Check for open)
      LHD
      Tester Connection Specified Condition
      GMV (B54-4) - Cooling fan resistor (A33-1) Below 1 Ω
      GMV1 (B54-18) - Cooling fan resistor (A33-4) Below 1 Ω
      GMV2 (A35-16) - Cooling fan resistor (A33-3) Below 1 Ω
      RHD
      Tester Connection Specified Condition
      GMV (B54-4) - Cooling fan resistor (A33-1) Below 1 Ω
      GMV1 (B54-18) - Cooling fan resistor (A33-4) Below 1 Ω
      GMV2 (A36-16) - Cooling fan resistor (A33-3) Below 1 Ω
      Standard resistance (Check for short)
      LHD
      Tester Connection Specified Condition
      GMV (B54-4) or Cooling fan resistor (A33-1) - Body ground 10 kΩ or higher
      GMV1 (B54-18) or Cooling fan resistor (A33-4) - Body ground 10 kΩ or higher
      GMV2 (A35-16) or Cooling fan resistor (A33-3) - Body ground 10 kΩ or higher
      RHD
      Tester Connection Specified Condition
      GMV (B54-4) or Cooling fan resistor (A33-1) - Body ground 10 kΩ or higher
      GMV1 (B54-18) or Cooling fan resistor (A33-4) - Body ground 10 kΩ or higher
      GMV2 (A36-16) or Cooling fan resistor (A33-3) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. REPLACE COOLING FAN RESISTOR


    NEXT

  12. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE FAN)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position and turn the intelligent tester on.

    3. Clear the DTC Click here.

    4. Select the following menu items: Powertrain / Engine and ECT / Active Test / Fan 1 and Fan 2.

    5. Check the operation of the fan while operating it using the intelligent tester.

      Standard
      Fan active test Condition
      Deactivated Fan stops
      Activated (Fan 1) Fan operates
      Activated (Fan 2) Fan operates

    NG

    REPLACE ECM

    OK

    END