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.

MONITOR STRATEGY

Related DTCs

P0989: Transmission fluid pressure switch No. 3 OFF malfunction

P0990: Transmission fluid pressure switch No. 3 ON malfunction
Required sensors/Components Transmission fluid pressure switch No. 3
Frequency of operation Continuous
Duration

P0989: 1.8 sec.

P0990 (a): 1.2 sec.

P0990 (b): 0.6 sec.
MIL operation 2 driving cycles
Sequence of operation None

TYPICAL ENABLING CONDITIONS

ALL:

The monitor will run whenever this DTC is not present.

(Not circuit malfunction)

P0712, P0713 (ATF temperature sensor circuit (TFT sensor))

P0115, P0117, P0118 (ECT sensor circuit)

P0715, P0717 (Turbine speed sensor circuit)

P0791, P0793 (Intermediate shaft speed sensor circuit)

P0748 (Shift solenoid valve SL1 circuit)

P0778 (Shift solenoid valve SL2 circuit)

P0798 (Shift solenoid valve SL3 circuit)

P2810 (Shift solenoid valve SL4 circuit)

P2759 (Shift solenoid valve SLU circuit)

P2769, P2770 (Shift solenoid valve SL circuit)

P0327, P0328, P0332, P0333 (KCS sensor circuit)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 ((ETCS) Electronic throttle control system)

U0100 (CAN communication system)
ECT (Engine coolant temperature) 40°C (104°F) or more
Spark advance from Max. retard timing by KCS control 0°CA or more
Transmission range "D"
TFT (Transmission fluid temperature) -10°C (14°F) or more
TFT (Transmission fluid temperature) sensor circuit No circuit malfunction
ECT (Engine coolant temperature) sensor circuit No circuit malfunction
Turbine speed sensor circuit No circuit malfunction
Intermediate shaft speed sensor circuit No circuit malfunction
Shift solenoid valve SL1 circuit No circuit malfunction
Shift solenoid valve SL2 circuit No circuit malfunction
Shift solenoid valve SL3 circuit No circuit malfunction
Shift solenoid valve SL4 circuit No circuit malfunction
Shift solenoid valve SLU circuit No circuit malfunction
Shift solenoid valve SL circuit No circuit malfunction
(KCS) Knock control sensor circuit No circuit malfunction
(ETCS) Electronic throttle control system Not system down
CAN communication system Not system down
Engine Starting
TCM selected gear Not 1st
Vehicle speed 15.5 mph (25 km/h) or more
Turbine speed/Output speed (NT/NO) with 1st 3.304 to 7.724
Turbine speed/Output speed (NT/NO) with 2nd 1.901 to 2.340
Turbine speed/Output speed (NT/NO) with 3rd 1.399 to 1.649
Turbine speed/Output speed (NT/NO) with 4th 0.998 to 1.138
Turbine speed/Output speed (NT/NO) with 5th 0.705 to 0.836
Turbine speed/Output speed (NT/NO) with 6th 0.568 to 0.695
P0989:
TCM lock-up command ON
Engine speed - Turbine speed Less than 35 rpm
Throttle valve opening angle 7% or more
Vehicle speed Less than 62.1 mph (100 km/h)
Shift solenoid valve SLU Not ON malfunction
P0990:
TCM indicated pressure valve of SLU Less than 4 kPa
TCM lock-up command OFF
Shift solenoid valve SLU Not malfunction
Shift solenoid valve SL Not OFF malfunction

TYPICAL MALFUNCTION THRESHOLDS

P0989:
Transmission fluid pressure switch No. 3 OFF
P0990:
Following conditions are met (a) and (b)
(a) Engine speed - Turbine speed 35 rpm or more
(b) Transmission fluid pressure switch No. 3 ON

WIRING DIAGRAM

A011SQRE28

INSPECTION PROCEDURE

Note

Perform the universal trip to clear permanent DTCs Click here.

PROCEDURE

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

    1. Connect the Techstream to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the Techstream on.

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

    5. Read the DTCs using the Techstream.

      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. Remove the TCM.

      A011V2EE57

    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
      Text in Illustration
      *a

      Component without harness connected

      (Transmission Wire)
    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. Disconnect the connector from the ATF temperature sensor assembly.

      A011SJ3E01

    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. Remove the TCM.

      A011R8ZE17

    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
      Text in Illustration
      *a

      Component without harness connected

      (Transmission Wire))
      *b TCM Side
      *c ATF Temperature Sensor Side
    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 Techstream to the DLC3.

    2. Start the engine and turn the Techstream 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 Techstream.

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

    END

    A

    REPLACE TCM Click here