HYBRID CONTROL SYSTEM, Diagnostic DTC:P274A1C, P274A1F

DTC Code DTC Name
P274A1C Transmission Fluid Temperature Sensor "C" Voltage Out of Range
P274A1F Transmission Fluid Temperature Sensor "C" Circuit Intermittent

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    These DTCs are stored when the transmission fluid temperature sensor output is abnormal. The cause of this malfunction may be one of the following:


      Hybrid vehicle control ECU internal malfunction

    • Hybrid vehicle control ECU malfunction


      Transmission fluid temperature sensor malfunction

    • Internal transmission fluid temperature sensor malfunction

    • Open or short in transmission fluid temperature sensor


      Wire harness between the transmission fluid temperature sensor and hybrid vehicle control ECU

    • The connectors are not connected properly

    • Foreign matter or water on the connector terminals

    • Open or short in wire harness

DESCRIPTION

Refer to the description for DTC P274A11.

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DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P274A1C Transmission Fluid Temperature Sensor "C" Voltage Out of Range

After a long soak, the value of the transmission fluid temperature sensor is different from the value of the other temperature sensors.

(2 trip detection logic)

 Hybrid vehicle transaxle assembly (Transmission fluid temperature sensor) Come on

Master Warning Light:

Comes on
P274A1F Transmission Fluid Temperature Sensor "C" Circuit Intermittent

Sudden change in transmission fluid temperature sensor output or hunting:

Unusual sudden change in transmission fluid temperature sensor output occurs and offset condition continues for a certain period of time, or unusual change in transmission fluid temperature sensor output occurs repeatedly.

(1 trip detection logic)

 Hybrid vehicle transaxle assembly (Transmission fluid temperature sensor) Come on

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P274A1C

  • Generator Temperature

  • Motor Temperature

  • Transaxle Oil Temperature
P274A1F Transaxle Oil Temperature

CONFIRMATION DRIVING PATTERN

Tech Tips

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

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    DTC P274A1C

  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off.

  5. Leave the vehicle as is for 5 hours or more and then check that the values of the Data List items "Generator Temperature", "Motor Temperature" and "Transaxle Oil Temperature" are approximately the same.

  6. Turn the power switch on (IG) and turn the GTS on.

  7. With power switch on (IG) and wait for 5 seconds or more.

  8. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.

  9. Check the DTC judgment result.

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.


    DTC P274A1F

  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for 2 minutes or more.

  5. Turn the power switch on (IG) and turn the GTS on.

  6. With power switch on (IG) and wait for 5 seconds or more.

  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.

  8. Check the DTC judgment result.

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.

PROCEDURE


  1. CHECK DTC OUTPUT (ENGINE)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (READY).

    3. Enter the following menus: Powertrain / Engine / Trouble Codes.

    4. Check for DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      No DTCs are output, or DTCs except the ones in the table below are also output. A
      Any of the following DTCs are also output. B
      Relevant DTC
      P261029 ECM/PCM Engine Off Timer Performance Signal Invalid

    5. Turn the power switch off.


    B

    GO TO DTC CHART (SFI SYSTEM) w/ Canister Pump Module: Click here
    GO TO DTC CHART (SFI SYSTEM) w/o Canister Pump Module: Click here

    A

  2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

    Result
    Proceed to
    OK
    NG

    1. Check the connector connections and contact pressure of the relevant terminals for the hybrid vehicle control ECU connectors.

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      B006HM7C01
      *A for LHD *B for RHD
      OK
      The connectors are connected securely and there are no contact pressure problems.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Click here

    NG

    CONNECT SECURELY