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

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

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

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

  • Transmission wire

  • TCM
P0990

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


  • Transmission fluid pressure switch No. 3 is ON when lock-up does not occur.

  • Lock-up does not occur when shift solenoid valve (SLU) is requested 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 ATF pressure switch is OFF with the lock-up solenoid ON or when the TCM detects that the ATF pressure switch is ON with the lock-up solenoid OFF.

WIRING DIAGRAM

A01G8FGE28

INSPECTION PROCEDURE

PROCEDURE


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


    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 / Trouble Codes.

    5. Read the DTCs using the GTS.

      Result
      Display (DTC Output) Proceed to
      Only "P0990" is output A
      Only "P0989" is output B
      "P0989 or P0990" and other DTCs are output C

      Tech Tips

      If a solenoid is stuck OFF, DTCs for several solenoids including the malfunctioning solenoid will be detected.


    B

    CHECK TRANSMISSION WIRE Click here

    C

    GO TO DTC CHART Click here

    A

  2. CHECK TRANSMISSION WIRE (SHORT TO GROUND)


    1. A01G6V7E48
      Text in Illustration
      *a

      Component without harness 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 (Valve body assembly) and other terminals Always 10 kΩ or higher

    NG

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

    OK

    REPLACE TCM Click here

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


    1. Remove the oil strainer assembly.

    2. A01G4THE01

      Disconnect the connector from the ATF temperature sensor assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (TPS3) - Body ground (Valve body assembly) and other terminals Always 10 kΩ or higher

    NG

    REPLACE ATF TEMPERATURE SENSOR ASSEMBLY Click here

    OK

    REPLACE TRANSMISSION WIRE Click here

  4. CHECK TRANSMISSION WIRE


    1. Remove the oil strainer assembly.

    2. A01G4ZSE16
      Text in Illustration
      *a

      Component without harness connected

      (Transmission Wire)
      *b TCM Side
      *c ATF Temperature Sensor Side

      Remove the TCM.

    3. Disconnect the connector from the ATF temperature sensor assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      19 (TPS3) TCM side - 1 (TPS3) sensor side Always Below 1 Ω
      1 (TPS3) sensor side - Body ground (Valve body assembly) and other terminals Always 10 kΩ or higher

    NG

    REPLACE TRANSMISSION WIRE Click here

    OK

  5. REPLACE ATF TEMPERATURE SENSOR ASSEMBLY

    Click here


    NEXT

  6. CHECK IF DTC OUTPUT RECURS


    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Clear the DTCs Click here.

      Tech Tips

      Write down the currently output DTCs before clearing them.

    4. Perform the monitor drive pattern Click here.

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

    6. Read the DTCs using the GTS.

      Result
      Display (DTC Output) Proceed to
      Only "P0989" is output A
      No output B

    B

    END

    A

    REPLACE TCM Click here