AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0873

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

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

All of the following conditions are met (2 trip detection logic)


  • Engine coolant temperature is 40°C (104°F) or more

  • ATF temperature is -10°C (14°F) or more

  • 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, SP2), water temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN

  • Both of the following conditions (a) and (b) are met


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

    2. Malfunction status occurs 2 times per trip

  • Shift solenoid valve SL1

  • Oil pressure switch

  • Transmission wire

  • Harness and connector

  • TCM

  • Valve body assembly

  • Automatic transmission assembly

 Comes on DTC stored

WIRING DIAGRAM

Refer to DTC P0872.

Click here

CAUTION / NOTICE / HINT

Note

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

Click here

Tech Tips

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.

    Click here

  2. Turn the engine switch off.

  3. Perform step (1) again.

  4. Check for DTCs again.

    Click here

PROCEDURE


  1. 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.


      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

      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

      		 -

      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

    B

    REPLACE TCM Click here

    C

    CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM) Click here

    A

  2. CHECK OIL PRESSURE SWITCH CIRCUIT


    1. B002CZ4C09
      *a

      Component with harness connected

      (TCM)

      Turn the engine switch off.

      Tech Tips

      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
      E5-9 (TPS1) - Body ground Engine switch off 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND) Click here

    OK

  3. INSPECT SHIFT SOLENOID VALVE SL1


    1. B002E4SC46
      *a

      Component without harness connected

      (Shift Solenoid Valve SL1)

      Remove the shift solenoid valve SL1.

      Click here

    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

    NG

    REPLACE SHIFT SOLENOID VALVE SL1 Click here

    OK

  4. INSPECT TRANSMISSION VALVE BODY ASSEMBLY


    1. Check the transmission valve body assembly.

      Click here

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

    OK

    REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY Click here

    NG

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)


    1. B002DMRC50
      *a

      Rear view of wire harness connector

      (to TCM)

      Disconnect the E5 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E5-9 (TPS1) - Body ground Engine switch off 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 7 Click here

    OK

  6. REPLACE TCM


    1. Replace the TCM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM A/T CODE REGISTRATION Click here

  7. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)


    1. Disconnect the E24 transmission wire connector.

    2. Disconnect the E5 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E24-17 (TPS1) - E5-9 (TPS1) Always Below 1 Ω
      E24-17 (TPS1) or E5-9 (TPS1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  8. INSPECT TRANSMISSION WIRE (OIL PRESSURE SWITCH)


    1. B002DEIC05
      *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.

      Click here

    2. Disconnect the E24 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

    OK

    REPLACE OIL PRESSURE SWITCH Click here

    NG

    REPAIR OR REPLACE TRANSMISSION WIRE Click here