SFI SYSTEM, Diagnostic DTC:P0481

DTC Code DTC Name
P0481 Fan2 Circuit Fault

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0481 Fan2 Circuit Fault

DTC Detection Condition


    Enable Criteria

  • Engine running


    Malfunction Criteria

  • -


    Diagnostic Mask

  • The service light will be illuminated for 30 seconds at the point the fault occurs, and then illuminated for 30 seconds after engine start if the fault is present


    Monitor

  • Continuous


    Potential failure modes

  • Wiring harness problem

  • Relay

  • ECU

  • Cooling fan No.2 relay No.2

  • Open or short in cooling fan No. 2 relay circuit

  • Wire harness or connector

  • ECM

 Comes on DTC stored

WIRING DIAGRAM

Refer to DTC P0480.

Click here

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF COOLING FAN NO.1 RELAY)


    1. Disconnect the A116 ECM connector.

      B00459KC08
      *1 ECM *a

      Front view of wire harness connector

      (to ECM)

    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
      A116-29 (FANH) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Result
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

  2. INSPECT COOLING FAN NO.2 RELAY


    1. Turn the engine switch off.

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

    3. Inspect the cooling fan No.2 relay.

      Click here

      Result
      Result
      OK
      NG

    NG

    REPLACE FAN NO. 2 RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (ECM - FAN NO. 2 RELAY)


    1. Disconnect the A116 ECM connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A116-29 (FANH) - 1 (FAN NO. 2 relay holder) Always Below 1 Ω
      A116-29 (FANH) or 1 (FAN NO. 2 relay holder) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - FAN NO. 2)


    1. Disconnect the No. 1 integration relay connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1D-15 - 2 (FAN NO. 2 relay holder) Always Below 1 Ω
      1D-15 or 2 (FAN NO. 2 relay holder) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT NO. 1 INTEGRATION RELAY


    1. Disconnect the No. 1 integration relay connector.

      B0045MHC06
      *a Engine Room Relay Block Assembly *b No. 1 Integration Relay
      *c

      Front view of wire harness connector

      (to No. 1 integration relay)

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1D-4 - 1D-14 Always Below 1 Ω
      1D-4 - 1D-15 Always Below 1 Ω
      1D-14 - 1D-15 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 INTEGRATION RELAY Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMVBLY)


    1. Disconnect the No. 1 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1D-14 - 3C-27 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  7. CHECK TERMINAL VOLTAGE (POWER SOURCE OF INSTRUMENT PANEL JUNCTION BLOCK ASSEMVBLY)


    1. B0046Q1C01
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      		 *b for LHD
      *c for RHD - -

      Disconnect the Instrument Panel Junction Block Assembly connector.

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      3E-1 - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      3F-1 - Body ground Always 11 to 14 V
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMVBLY - BODY GROUND)


    1. Disconnect the 3B Instrument Panel Junction Block Assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-8 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR