AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P0989 and 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 No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0989

Transmission Fluid Pressure Sensor / Switch "E" Circuit Low

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

Comes on

DTC stored

P0990

Transmission Fluid Pressure Sensor / Switch "E" Circuit High

Both conditions are met (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.

  • 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 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

CAUTION / NOTICE / HINT

Note:

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

Click here

  1. DATA LIST

    Tip:

    Using the GTS 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 GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

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

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

      Powertrain > ECT > Data List

      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

      -

      Powertrain > ECT > Data List

      Tester Display

      TPS 3 Switch

PROCEDURE

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

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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 P0989 is output

      A

      Only P0990 is output

      B

      P0989 or P0990 and other DTCs are output

      C
      Tip:

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

    B

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

    C

    GO TO DTC CHART

    Click hereClick here

    A

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

    1. Disconnect the ATF temperature sensor assembly connector.

    2. Remove the TCM.

    3. C206304C04

      *1

      Transmission Wire

      *a

      ATF Temperature Sensor Assembly Side

      *b

      TCM Side

      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 (transmission valve body assembly) and any other terminals except 19 (TPS3) TCM side

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    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

    Result

    Proceed to

    NEXT
    NEXT

  4. CHECK IF DTC OUTPUT RECURS (DTC P0989)

    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Clear the DTCs.

      Click here

      Tip:

      Write down the currently output DTCs before clearing them.

      Powertrain > ECT > Clear DTCs

    4. Perform the monitor drive pattern.

      Click hereClick 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 P0989 is output

      A

      DTCs are not output

      B
    A

    REPLACE TCM

    Click here

    B

    END

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

    1. C207057C18

      *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 (transmission valve body assembly) and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE TCM

    Click here

    NG

  6. INSPECT NO. 3 ATF PRESSURE SWITCH (ATF TEMPERATURE SENSOR ASSEMBLY)

    1. C206308C06

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

    Click here