HYBRID CONTROL SYSTEM, Diagnostic DTC:P0848-540

DTC Code DTC Name
P0848-540 Transmission Fluid Pressure Sensor/Switch "B" Circuit High

DESCRIPTION

Refer to the description for DTC P0731-871 Click here.

DTC No. INF Code DTC Detection Condition Trouble Area
P0848 540 Malfunction in the oil pressure sensor circuit (open circuit)

  • Hybrid vehicle transmission assembly

  • Power management control ECU

  • Oil pressure sensor

  • Wire harness or connector

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0731-871 Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Check if DTCs are output.

      Result
      Result Proceed to
      P0848-540 only is output. A
      Any of the following DTCs are also output. B
      DTC No. Relevant Diagnosis
      P0731-871 Gear 1 Incorrect Ratio
      P06A4-209 Sensor Reference Voltage "D" Circuit Low
      P06A5-210 Sensor Reference Voltage "D" Circuit High

    5. Turn the power switch off.


    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    A

  2. CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR)


    1. A01FQC6E01
      Text in Illustration
      *A for LHD
      *B for RHD

      Check the connector connections and contact pressure of the relevant terminals for the power management control ECU connectors Click here.

      OK
      The connectors are connected securely and there are no contact pressure problems.

    NG

    CONNECT SECURELY

    OK

  3. CHECK CONNECTOR CONNECTION CONDITION (OIL PRESSURE SENSOR)


    1. A01FTXY

      Check the connection of the oil pressure sensor connector Click here.

      OK
      The connector is connected securely and there are no contact problems.

    NG

    CONNECT SECURELY

    OK

  4. READ VALUE USING GTS (POWER SUPPLY SENSOR VOLTAGE)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Power Supply Sensor Voltage.

    4. Read the Data List.

      OK
      Tester Display Switch Condition Specified Condition
      Power Supply Sensor Voltage Power switch on (IG) 4.75 to 5.25 V

    5. Turn the power switch off.


    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  5. CHECK POWER MANAGEMENT CONTROL ECU (VOLTAGE)


    1. A01FQNCE12
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Oil Pressure Sensor)

      Disconnect the oil pressure sensor connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F54-3 (VC) - F54-1 (GND) Power switch on (IG) 4.75 to 5.25 V

    4. Turn the power switch off.

    5. Connect the oil pressure sensor connector.


    NG

    Click here

    OK

  6. READ VALUE USING GTS (B2 OIL PRESSURE SENSOR)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Data List / Power Supply Sensor Voltage.

    4. Read the Data List.

      OK
      Tester Display Switch Condition Specified Condition
      Power Supply Sensor Voltage Power switch on (IG) 4.75 to 5.25 V

    5. Turn the power switch off.


    NG

    Click here

    OK

  7. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (OIL PRESSURE SENSOR)


    1. A01FQZ9E93
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the connector from the power management control ECU.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N91-25 (VPT1) - N91-24 (PTO1) 68°F (20°C) 1.0 to 4.0 Ω
      N91-24 (PTO1) - N91-23 (EPT1) 68°F (20°C) 5.0 to 10.0 Ω

    3. Connect the power management control ECU connector.


    NG

    REPLACE OIL PRESSURE SENSOR Click here

    OK

  8. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Read and record the DTCs and freeze frame data.

    5. Clear DTCs and freeze frame data.

    6. Turn the power switch off.


    NEXT

  9. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (READY).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Check if DTCs are output.

      Result
      Result Proceed to
      P0848-540 is not output. A
      P0848-540 is output. B

      Note

      This DTC is not output when the power switch is on (IG). Therefore, make sure to perform the inspection with the power switch on (READY).

    5. Turn the power switch off.


    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    A

  10. CHECK FLUID LEAKS


    1. Check for fluid leaks from the hybrid vehicle transmission assembly.

      OK
      There are no fluid leaks.

    NG

    REPAIR OR REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  11. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - OIL PRESSURE SENSOR)


    1. A01FS9GE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)
      *b

      Front view of wire harness connector

      (to Oil Pressure Sensor)

      Disconnect the oil pressure sensor connector.

    2. Disconnect the power management control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      N91-25 (VPT1) - F54-3 (VC) Power switch off Below 1 Ω
      N91-24 (PTO1) - F54-2 (VOUT) Power switch off Below 1 Ω
      N91-23 (EPT1) - F54-1 (GND) Power switch off Below 1 Ω
      N91-25 (VPT1) - Body ground Power switch off 10 kΩ or higher
      N91-24 (PTO1) - Body ground Power switch off 10 kΩ or higher
      N91-23 (EPT1) - Body ground Power switch off 10 kΩ or higher

    4. Connect the oil pressure sensor connector.

    5. Connect the power management control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here