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 higher, ATF temperature is -10°C (14°F) or higher, 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, speed sensors (NT, NC3, SP2), engine coolant 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 or connector

  • TCM

  • Valve body assembly

  • Torque converter clutch 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 / DTC.

    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. CHECK OIL PRESSURE SWITCH CIRCUIT


    1. A01GMHIE11

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E6-25 (TPS1) - Body ground Always 10 kΩ or higher

      Tech Tips

      Do not disconnect the connectors of the TCM.


    NG

    READ VALUE USING DATA LIST (TPS 1 SW SIGNAL) Click here

    OK

  3. INSPECT SHIFT SOLENOID VALVE SL1


    1. A01GNU1E01

      Remove 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 shift solenoid valve SL1 - Terminal 2 20°C (68°F) 5.0 to 5.6 Ω

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

      OK
      Valve moves and makes operating noise.

    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 are no foreign objects on any valve.

    NG

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Click here

    OK

  5. INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY


    1. Check the torque converter clutch assembly Click here.

      OK
      The torque converter clutch operates normally.

    NG

    REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY Click here

    OK

    REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY Click here

  6. READ VALUE USING DATA LIST (TPS 1 SW SIGNAL)


    1. A01GMHIE10

      Connect terminals TPS1 and E1 of the E5 and E6 TCM connectors.

      Tech Tips

      Before connecting the terminals, do 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.

      Result
      Tester Display Proceed to
      TPS 1 Switch OFF A
      TPS 1 Switch ON B

    B

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

    A

  7. REPLACE TCM


    1. Replace the TCM Click here.


    NEXT

    PERFORM A/T CODE REGISTRATION Click here

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


    1. A01GJ47E06

      Disconnect the E50 transmission wire connector.

    2. Disconnect the E6 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E50-17 (TPS1) - E6-25 (TPS1) Always Below 1 Ω
      E50-17 (TPS1) or E6-25 (TPS1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT TRANSMISSION WIRE (OIL PRESSURE SWITCH)


    1. A01GN20E01

      Disconnect the oil pressure switch connector.

    2. Disconnect the E50 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