DTC P0878-877: Transmission Fluid Pressure Sensor / Switch "D" Circuit High: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   Result	Proceed to
   P0873-877 only is output.	A
   P0731-871 is output.	B

B → See step   18 

A: Go to next step 

1. Turn the power switch off.
2. Check the connections of the hybrid vehicle control ECU connectors.

   OK

   The connectors are connected securely and there are no contact problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Check the connection of the transmission wire connector.

   OK

   The connector is connected securely and there are no contact problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Disconnect connector E55 from the hybrid vehicle control ECU.
2. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying Connector E55 From Hybrid Vehicle Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   E55-19 (PB2) - Body ground	Power switch off	10 kΩ or higher

NG → See step   12 

OK: Go to next step 

1. Connect connector E55 to the hybrid vehicle control ECU.
   Fig 2: Identifying E61 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the transmission wire connector.
3. Turn the power switch on (IG).
   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

4. Select the following menu items: Powertrain / Hybrid Control / Data List / B2 Oil Pressure.
5. Check "B2 Oil Pressure" when terminal 10 (PB2) of the transmission wire vehicle side connector is connected to body ground, and when the terminal is not connected to body ground.

   OK

   Tester Display	Condition	Specified Condition
   B2 Oil Pressure	E61-10 (PB2) is connected to body ground	ON
   	E61-10 (PB2) is not connected to body ground	OFF

NG → See step   15 

OK: Go to next step 

1. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
2. Read and record the DTCs and freeze frame data.
3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
4. Clear DTCs and freeze frame data.

NEXT: Go to next step 

1. Turn the power switch on (READY).
2. Select the following menu items: Powertrain / Hybrid Control / Active Test / Control the Shift Position.
3. Select the following menu items: All Data / B1 Oil Pressure, B2 Oil Pressure, Line Pressure, Line Pressure Solenoid.
4. Perform the "Control the Shift Position" active test.

   OK

   Item	Condition	Specified Condition
   		Data List
   		B1 Oil Pressure	B2 Oil Pressure	Line Pressure	Line Pressure Solenoid
   Control the Shift Position	Lo	OFF	ON	ON	OFF
   	Hi	ON	OFF	ON	OFF

5. Switch the shift position between "Lo" and "Hi" several times using the "Control the Shift Position" active test. Make sure that there is no abnormal data in the data list.

   OK

   There is no abnormal data in the data list.

   NOTE:

   Transmission system DTCs may be set if the "Control the Shift Position" active test is canceled before it is completed.

NG → See step   13 

OK: Go to next step 

1. Check for intermittent problems. Refer to CHECK FOR INTERMITTENT PROBLEMS .

NG → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

OK: Go to next step 

1. Check for fluid leaks from the hybrid vehicle transmission assembly.

   OK

   There are no fluid leaks.

NG → See step   19 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

NG → See step   20 

OK → See step   17 

1. Turn the power switch off.
2. Disconnect the transmission wire connector.
   Fig 3: Identifying E61 And E55 Terminal Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Turn the power switch on (IG).
4. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   E55-19 (PB2) - Body ground	Power switch on (IG)	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

5. Turn the power switch off.
6. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Switch Condition	Specified Condition
   E55-19 (PB2) - E61-10 (PB2)	Power switch off	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Switch Condition	Specified Condition
   E55-19 (PB2) or E61-10 (PB2) - Body ground and other terminals	Power switch off	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

NG → See step   20 

OK → See step   17 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   16