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

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 No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0989 Transmission Fluid Pressure Sensor / Switch "E" Circuit Low

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


  1. The vehicle is being driven.

  2. The No. 3 ATF pressure switch is OFF when lock-up occurs in response to a lock-up request

  3. 1.8 seconds

  4. 2-trip detection logic

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

  • Transmission wire

  • TCM

 Comes on DTC stored
P0990 Transmission Fluid Pressure Sensor / Switch "E" Circuit High

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


  1. Lock-up is not operating.

  2. Both of the following conditions are met


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

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

  3. 1.2 seconds

  4. 2-trip detection logic

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

  • Transmission wire

  • TCM

 Comes on DTC stored

MONITOR DESCRIPTION

The TCM illuminates the MIL and stores a DTC if it detects that the No. 3 ATF pressure switch is OFF with the lock-up solenoid ON or if it detects that the No. 3 ATF pressure switch is ON with the lock-up solenoid OFF.

WIRING DIAGRAM

A01IJGYE02
*a Transmission Wire
*b No. 3 ATF Pressure Switch
*c ATF Temperature Sensor Assembly
*d Automatic Transaxle Assembly

CAUTION / NOTICE / HINT

Note

Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

Click here

Tech Tips

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Perform the Lock-up Function inspection in Road Test.

    Click here

  2. Turn the engine switch off.

  3. Perform step (1) again.

  4. Check for DTCs again.

    Click here

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.


      Powertrain > ECT > Trouble Codes

    5. Read the DTCs using the GTS.

      Result
      Result Proceed to
      Only DTC P0990 is output A
      Only DTC P0989 is output B
      DTC 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 stored.


    B

    CHECK TRANSMISSION WIRE Click here

    C

    GO TO DTC CHART Click here

    A

  2. CHECK TRANSMISSION WIRE (SHORT TO GROUND)


    1. A01IIKHC37
      *a

      Component without harness connected

      (Transmission Wire)

      Remove the TCM.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      19 (TPS3) - Body ground (transmission valve body assembly) and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TCM Click here

    NG

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


    1. Remove the valve body oil strainer assembly.

      Click here

    2. A01IF25C02
      *a

      Component without harness connected

      (ATF Temperature Sensor Assembly)

      Disconnect the ATF temperature sensor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5 (TPS3) - Body ground (transmission valve body assembly) and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TRANSMISSION WIRE Click here

    NG

    REPLACE ATF TEMPERATURE SENSOR ASSEMBLY Click here

  4. CHECK TRANSMISSION WIRE


    1. Remove the oil strainer assembly.

      Click here

    2. Remove the TCM.

      Click here

    3. Disconnect the ATF temperature sensor assembly connector.

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

      A01IK05C03
      *a

      Component without harness connected

      (Transmission Wire)

      		 *b TCM Side
      *c ATF Temperature Sensor Assembly Side - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      19 (TPS3) TCM side - 5 (TPS3) sensor side Always Below 1 Ω
      5 (TPS3) sensor side - Body ground (transmission valve body assembly) and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TRANSMISSION WIRE Click here

    OK

  5. REPLACE ATF TEMPERATURE SENSOR ASSEMBLY

    Click here

    Result
    Proceed to
    NEXT

    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


      Powertrain > ECT > Clear DTCs

      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.


      Powertrain > ECT > Trouble Codes

    6. Read the DTCs using the GTS.

      Result
      Result Proceed to
      Only DTC P0989 is output A
      DTCs are not output B

    A

    REPLACE TCM Click here

    B

    END