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AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0873

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DTC Code DTC Name
P0873 Transmission Fluid Pressure Sensor / Switch "C" Circuit High
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DESCRIPTION

The oil pressure switch, which is built into the valve body, detects the fluid pressure of the SL1 fluid pressure circuit. If shift solenoid valve SL1 is stuck ON, P0873 is output.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0873 Transmission Fluid Pressure Sensor / Switch "C" Circuit High

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


  1. Engine coolant temperature is 40°C (104°F) or more, ATF temperature is -10°C (14°F) or more, and the vehicle is driven with the shift lever in D (no malfunctions are detected in shift solenoid valve SL1, 2, 3, 4 and 5, SR, transmission revolution sensors (NT, NC3, SP2), water temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN2)

  2. When the actual gear is 6th to 8th gear, the oil pressure switch is ON

  3. Malfunction status occurs 2 times (1 trip)

  4. 2-trip detection logic

  • Shift solenoid valve SL1

  • Oil pressure switch

  • Transmission wire

  • Harness and connector

  • TCM

  • Valve body assembly

  • Automatic transmission assembly

 Comes on DTC stored
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WIRING DIAGRAM

Refer to DTC P0872.

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CAUTION / NOTICE / HINT

Note:

Perform registration and/or initialization when parts related to the automatic transmission are replaced.

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Tip:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Perform the D Position Shift Test in Road Test.

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  2. Turn the engine switch off.

  3. Perform step (1) again.

  4. Check for DTCs again.

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PROCEDURE


  1. Click here

    READ VALUE USING GTS (TPS 1 SWITCH SIGNAL)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / ECT / Active Test / Control the Shift Position / Data List / TPS 1 Switch.


      1. Powertrain > ECT > Active Test
        Tester Display Measurement Item Control Range Diagnostic Note
        Control the Shift Position Operates the shift solenoid valves to allow gears to be selected manually.

        • Press "→" button: Upshift occurs

        • Press "←" button: Downshift occurs

        Possible to check operation of the shift solenoid valves.

        [Vehicle Condition]

        Vehicle speed: 50 km/h (31 mph) or less



      1. Powertrain > ECT > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        TPS 1 Switch Oil pressure switch status ON or OFF

        • ON: Gear is 1st to 5th

        • OFF: Gear is 6th to 8th; or shift lever is in P, N or R

        		 -



      1. Powertrain > ECT > Active Test
        Active Test Display
        Control the Shift Position
        Data List Display
        TPS 1 Switch





      Result
      Result Proceed to
      When the engine is idling with the shift lever in P, N or R, ON is displayed for TPS 1 Switch on the Data List. A
      When the vehicle is being driven in a gear position between 6th and 8th or when the engine is idling with the shift lever in P, N or R, OFF is displayed for TPS 1 Switch on the Data List. B
      When the vehicle is being driven in a gear position between 6th and 8th, ON is displayed for TPS 1 Switch on the Data List. C

  2. Click here

    CHECK OIL PRESSURE SWITCH CIRCUIT


    1. B0066H6C07
      *a

      Component with harness connected

      (TCM)

      Turn the engine switch off.

      Tip:

      Before checking, perform visual and contact pressure checks on the TCM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F8-9 (TPS1) - Body ground Engine switch off 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

  3. Click here

    INSPECT SHIFT SOLENOID VALVE SL1


    1. B00662VC46
      *a

      Component without harness connected

      (Shift Solenoid Valve SL1)

      Remove the shift solenoid valve SL1.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Terminal 1 of the shift solenoid valve SL1 - terminal 2 20°C (68°F) 5.0 to 5.6 Ω

    3. Connect a positive (+) lead from the battery with a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector. Check that the valve moves and makes an operating sound.

      OK
      Valve moves and makes an operating sound.
      Result
      Proceed to
      OK
      NG

  4. Click here

    INSPECT TRANSMISSION VALVE BODY ASSEMBLY


    1. Check the transmission valve body assembly.

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      OK
      There is no foreign matter on each valve and they operate smoothly.
      Result
      Proceed to
      OK
      NG

    • OK

      REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLYClick here

  5. Click here

    CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)


    1. B0067R2C37
      *a

      Rear view of wire harness connector

      (to TCM)

      Disconnect the F8 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F8-9 (TPS1) - Body ground Engine switch off 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

  6. Click here

    REPLACE TCM


    1. Replace the TCM.

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      Result
      Proceed to
      NEXT

  7. Click here

    CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)


    1. Disconnect the F25 transmission wire connector.

    2. Disconnect the F8 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F25-17 (TPS1) - F8-9 (TPS1) Always Below 1 Ω
      F25-17 (TPS1) or F8-9 (TPS1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - TCM)

  8. Click here

    INSPECT TRANSMISSION WIRE (OIL PRESSURE SWITCH)


    1. B0067UXC05
      *a

      Front view of wire harness connector

      (to Oil Pressure Switch Connector)
      *b

      Component without harness connected

      (Transmission Wire)
      *c Connector

      Disconnect the oil pressure switch connector.

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    2. Disconnect the F25 transmission wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Oil pressure switch connector - 17 (TPS1) Always Below 1 Ω
      Oil pressure switch connector or 17 (TPS1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG