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 Code

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0873

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

  2. When actual gear is 6th to 8th gear, 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

WIRING DIAGRAM

Refer to DTC P0872 Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC OUTPUT (IN ADDITION TO DTC P0746 AND P0873)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Powertrain / ECT / Trouble Codes.

    5. Read the DTCs using the intelligent tester.

      Result
      Display (DTC Output) Proceed to
      Only P0746 and P0873 are output A
      P0746, P0873 and other DTCs are output B

      Tech Tips

      If any other codes besides P0746 and P0873 are output, perform troubleshooting for those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (TPS 1 SW SIGNAL)


    1. A015Z2ZE04

      Connect terminals TPS1 and E1 of the TCM connectors.

      Tech Tips

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

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester on.

    5. Enter the following menus: Powertrain / ECT / Data List.

    6. Read the value displayed on the intelligent tester.

      Standard
      Tester Display Condition
      TPS 1 Switch ON Gear is 1st to 5th
      TPS 1 Switch OFF Gear is 6th to 8th; or shift lever is in P, N or R

    NG

    CHECK OIL PRESSURE SWITCH CIRCUIT Click here

    OK

  3. REPLACE TCM


    1. Replace the TCM Click here.


    NEXT

    PERFORM A/T CODE REGISTRATION Click here

  4. CHECK OIL PRESSURE SWITCH CIRCUIT


    1. A015Z2ZE04

      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
      E59-9 (TPS1) - Body ground Engine switch off 10 kΩ or higher
      Result
      Result Proceed to
      OK B
      NG A

    B

    INSPECT SHIFT SOLENOID VALVE SL1 Click here

    A

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


    1. A015ZRFE17

      Disconnect the TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E59-9 (TPS1) - Body ground Engine switch off 10 kΩ or higher

    NG

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

    OK

  6. REPLACE TCM


    1. Replace the TCM Click here


    NEXT

    PERFORM A/T CODE REGISTRATION Click here

  7. INSPECT SHIFT SOLENOID VALVE SL1


    1. A0161CGE01

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

      OK
      Valve moves and makes an operating sound.

    NG

    REPLACE SHIFT SOLENOID VALVE SL1 Click here

    OK

  8. INSPECT TRANSMISSION VALVE BODY ASSEMBLY


    1. Check the transmission valve body assembly Click here.

      OK
      There are no foreign objects on any valve.

    NG

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Click here

    OK

    REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY Click here

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


    1. A016249E32

      Disconnect the transmission wire connector.

    2. Disconnect the TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E47-17 (TPS1) - E59-9 (TPS1) Always Below 1 Ω
      E47-17 (TPS1) or E59-9 (TPS1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. INSPECT TRANSMISSION WIRE (OIL PRESSURE SWITCH)


    1. A0163EZE01

      Disconnect the oil pressure switch connector Click here.

    2. Disconnect the 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

    NG

    REPAIR OR REPLACE TRANSMISSION WIRE Click here

    OK

    REPLACE OIL PRESSURE SWITCH Click here