AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P0872, P0873

DTC Code DTC Name
P0872 Transmission Fluid Pressure Sensor / Switch "C" Circuit Low
P0873 Transmission Fluid Pressure Sensor / Switch "C" Circuit High

DESCRIPTION

The No. 1 ATF pressure switch is installed in the shift solenoid valve ATF output passage. This switch is used to identify the malfunctioning part when a fail-safe operation is performed. If the shift solenoid valve malfunctions when the ATF pressure switch has a malfunction, a fail-safe operation will be performed. This fail-safe operation is different from the fail-safe operation performed when the shift solenoid valve malfunctions and the ATF pressure switch is normal.

DTC Code DTC Detection Condition Trouble Area
P0872 No. 1 ATF pressure switch off state is detected twice when any of the gears from 1st to 4th engages normally (2-trip detection logic).

  • No. 1 ATF pressure switch (ATF temperature sensor assembly)

  • Transmission wire

  • TCM
P0873 No. 1 ATF pressure switch on state is detected twice when 5th or 6th gear engages normally (2-trip detection logic).

WIRING DIAGRAM

Refer to DTC P0712 Click here.

INSPECTION PROCEDURE


  1. DATA LIST

    Tech Tips

    Using the intelligent tester to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

    Note

    In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.


    1. Warm up the engine.

    2. Turn the ignition switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the intelligent tester on.

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

    7. According to the display on the tester, read the Data List.

      ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      TPS 1 Switch

      No. 1 ATF pressure switch status/

      ON or OFF

      • ON: Gear is 1st, 2nd, 3rd or 4th

      • OFF: Gear is 5th or 6th

      		 -

PROCEDURE


  1. CHECK DTC OUTPUT (IN ADDITION TO DTC P0872 OR P0873)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Powertrain / ECT / DTC.

    5. Read the DTCs using the intelligent tester.

      Result
      Result Proceed to
      Only P0872 is output A
      Only P0873 is output B
      P0872 or P0873 and other DTCs are output C

    B

    INSPECT TRANSMISSION WIRE (NO. 1 ATF PRESSURE SWITCH) Click here

    C

    GO TO DTC CHART Click here

    A

  2. INSPECT TRANSMISSION WIRE (NO. 1 ATF PRESSURE SWITCH)


    1. A01IPQ7E06
      Text in Illustration
      *1 Transmission Wire
      *a ATF Temperature Sensor Assembly Side
      *b TCM Side

      Disconnect the ATF temperature sensor assembly connector.

    2. Remove the TCM.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      TPS1 ATF temperature sensor assembly side - 10 (TPS1) TCM side Always Below 1 Ω
      TPS1 ATF temperature sensor assembly side - Body ground (valve body assembly) or any other terminals except 10 (TPS1) TCM side Always 10 kΩ or higher

    NG

    REPLACE TRANSMISSION WIRE Click here

    OK

  3. REPLACE NO. 1 ATF PRESSURE SWITCH (ATF TEMPERATURE SENSOR ASSEMBLY)


    1. Replace the ATF temperature sensor assembly Click here.


    NEXT

  4. CHECK IF DTC OUTPUT RECURS (DTC P0872)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Powertrain / ECT / DTC / Clear.

      Tech Tips

      Write down the currently output DTCs before clearing them.

    5. Perform the monitor drive pattern Click here.

    6. Enter the following menus: Powertrain / ECT / DTC.

    7. Read the DTCs using the intelligent tester.

      Result
      Result Proceed to
      Only P0872 is output A
      DTCs are not output B

    B

    END

    A

    REPLACE TCM Click here

  5. INSPECT TRANSMISSION WIRE (NO. 1 ATF PRESSURE SWITCH)


    1. A01ITDLE19
      Text in Illustration
      *a

      Component without TCM connected

      (Transmission Wire)

      Remove the TCM.

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

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

    NG

    INSPECT NO. 1 ATF PRESSURE SWITCH Click here

    OK

    REPLACE TCM Click here

  6. INSPECT NO. 1 ATF PRESSURE SWITCH


    1. A01IULTE06
      Text in Illustration
      *a

      Component without harness connected

      (ATF Temperature Sensor Assembly)

      Disconnect the ATF temperature sensor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      TPS1 - Body ground (valve body assembly) or other terminals Always 10 kΩ or higher

    NG

    REPLACE NO. 1 ATF PRESSURE SWITCH (ATF TEMPERATURE SENSOR ASSEMBLY) Click here

    OK

    REPLACE TRANSMISSION WIRE Click here