AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P0989, P0990

DTC Code DTC Name
P0989 Transmission Fluid Pressure Sensor / Switch "E" Circuit Low
P0990 Transmission Fluid Pressure Sensor / Switch "E" Circuit High

DESCRIPTION

The No. 3 ATF pressure switch is installed in the lock-up solenoid ATF output passage and is used to detect a malfunction in the lock-up solenoid.

DTC Code DTC Detection Condition Trouble Area
P0989 No. 3 ATF pressure switch is off when lock-up occurs in response to a lock-up request (2-trip detection logic).

  • No. 3 ATF pressure switch (ATF temperature sensor assembly)

  • Transmission wire

  • TCM
P0990

When both of the following are detected (2-trip detection logic):


  • No. 3 ATF pressure switch is on when lock-up does not occur.

  • Lock-up does not occur when shift solenoid valve SLU is commanded to turn off in the lock-up range.

MONITOR DESCRIPTION

The TCM illuminates the MIL and stores the DTC when the TCM detects that the No. 3 ATF pressure switch is off with the lock-up solenoid on or when the TCM detects that the No. 3 ATF pressure switch is on with the lock-up solenoid off.

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 3 Switch

      No. 3 ATF pressure switch status/

      ON or OFF

      • ON: Shift solenoid valve SLU is on

      • OFF: Shift solenoid valve SLU is off

      		 -

PROCEDURE


  1. CHECK DTC OUTPUT (IN ADDITION TO DTC P0989 OR P0990)


    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 P0989 is output A
      Only P0990 is output B
      P0989 or P0990 and other DTCs are output C

    B

    INSPECT TRANSMISSION WIRE (NO. 3 ATF PRESSURE SWITCH) Click here

    C

    GO TO DTC CHART Click here

    A

  2. INSPECT TRANSMISSION WIRE (NO. 3 ATF PRESSURE SWITCH)


    1. A01IPQ7E08
      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
      TPS3 ATF temperature sensor assembly side - 19 (TPS3) TCM side Always Below 1 Ω
      TPS3 ATF temperature sensor assembly side - Body ground (valve body assembly) or any other terminals except 19 (TPS3) TCM side Always 10 kΩ or higher

    NG

    REPLACE TRANSMISSION WIRE Click here

    OK

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


    1. Replace the ATF temperature sensor assembly Click here.


    NEXT

  4. CHECK IF DTC OUTPUT RECURS (DTC P0989)


    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 P0989 is output A
      DTCs are not output B

    B

    END

    A

    REPLACE TCM Click here

  5. INSPECT TRANSMISSION WIRE (NO. 3 ATF PRESSURE SWITCH)


    1. A01ITDLE21
      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
      19 (TPS3) - Body ground Always 10 kΩ or higher

    NG

    INSPECT NO. 3 ATF PRESSURE SWITCH Click here

    OK

    REPLACE TCM Click here

  6. INSPECT NO. 3 ATF PRESSURE SWITCH


    1. A01IULTE08
      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
      TPS3 - Body ground (valve body assembly) or other terminals Always 10 kΩ or higher

    NG

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

    OK

    REPLACE TRANSMISSION WIRE Click here