DTC P0989: Transmission Fluid Pressure Sensor / Switch "E" Circuit Low; DTC P0990: Transmission Fluid Pressure Sensor / Switch "E" Circuit High: Procedure

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

   HINT: 

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

B → See step   4 

C → See step   7 

A: Go to next step 

1. Remove the TCM.
   Fig 1: Checking Transmission Wire (Short)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 → See step   3 

OK → See step   9 

1. Remove the oil strainer assembly.
2. Disconnect the connector from the ATF temperature sensor assembly.
   Fig 2: Checking ATF Temperature Sensor Assembly (ATF Pressure Switch No. 3)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 → See step   10 

OK → See step   8 

1. Remove the oil strainer assembly.
2. Remove the TCM.
   Fig 3: Checking Transmission Wire Resistance

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 → See step   8 

OK: Go to next step 

Refer to COMPONENTS

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Start the engine and turn the Techstream on.
3. Clear the DTCs. Refer to DTC CHECK / CLEAR .

   HINT: 

   Write down the currently output DTCs before clearing them.

4. Perform the monitor drive pattern. Refer to MONITOR DRIVE PATTERN .
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 → See step   9