DTC P0870-11: Transmission Fluid Pressure Sensor/Switch Circuit Short to Ground [11/2017 - 11/2019]: 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 / Transmission / Active Test.

   Powertrain > Transmission > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Control the Shift Position	Operates the shift solenoid valves to allow gears to be selected manually.	1st/2nd/3rd/4th/5th/6th/7th/8th Start/Stop	Possible to check operation of the shift solenoid valves. [Vehicle Condition]  Vehicle speed: 50 km/h (30 mph) or less

5. Select T/M Pressure SW No. 1 in the Data List.

   Powertrain > Transmission > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   T/M Pressure SW No. 1	Oil pressure switch status	ON or OFF	ON: Gear is 1st to 5th OFF: Gear is 6th to 8th, or shift lever is in P, N or R	-

6. While performing the "Control the Shift Position" Active Test, check T/M Pressure SW No. 1 in the Data List.

   Powertrain > Transmission > Active Test 

   Active Test Display
   Control the Shift Position

   Data List Display
   T/M Pressure SW No. 1

   Result

   Result	Proceed to
   When the vehicle is being driven in a gear position between 1st and 5th, ON is displayed for T/M Pressure SW No. 1 on the Data List.	A
   When the vehicle is being driven in a gear position between 1st and 5th, OFF is displayed for T/M Pressure SW No. 1 on the Data List.	B

Result: 

B 

See step  3

Result: 

A 

See step  2

1. Replace the ECM.

   Refer to COMPONENTS [11/2017 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

PERFORM A/T CODE REGISTRATION. Refer to  REGISTRATION [11/2017 - ] 

1. Disconnect the F61 transmission wire connector.
2. Disconnect the F87 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F61-17 (TPS1) - F87-138 (TPS1)	Always	Below 1 Ω
   F61-17 (TPS1) or F87-138 (TPS1) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the oil pressure switch connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Oil Pressure Switch Connector)
   *b	Component without harness connected (Transmission Wire)
   *c	Connector

   Refer to DISASSEMBLY [09/2014 - ]

2. Disconnect the F61 transmission wire connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Oil pressure switch connector - 17 (TPS1)	Always	Below 1 Ω
   Oil pressure switch connector or 17 (TPS1) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE OIL PRESSURE SWITCH. Refer to  COMPONENTS [09/2014 - ] 

Result: 

NG 

REPAIR OR REPLACE TRANSMISSION WIRE. Refer to  COMPONENTS [09/2014 - ]