DTC P2796-12: Electromagnetic Oil Pump Circuit Short to Battery [10/2022 - ]: Procedure

1. Enter the following menus: Powertrain / Stop and Start / Utility / Vehicle Control History (RoB).

   Powertrain > Stop and Start > Utility 

   Tester Display
   Vehicle Control History (RoB)

2. Check vehicle control history.

   Result

   Result	Proceed to
   Vehicle control history item BBC Boosting Output Overcurrent stored	A
   Vehicle control history item not stored	B

Result: 

B 

See step  5

Result: 

A 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H66-9 (EMOP) - Other terminals*	Always	10 kΩ or higher

   1. *: Except A33-8 (GND1) terminal

   Result

   Proceed to
   OK
   NG

Result: 

OK 

GO TO BACKUP BOOST CONVERTER CIRCUIT. Refer to  Backup Boost Converter Circuit [10/2022 - 11/2023]  , or refer to  Backup Boost Converter Circuit [11/2023 - ] 

Result: 

NG 

See step  3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H66-9 (EMOP) - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

See step  4

1. Disconnect the engine stop and start ECU connector.
2. Disconnect the transmission wire connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H66-9 (EMOP) or C51-29 (EMP+) - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch to ON.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Result
   H66-8 (EGND) - Body ground	Ignition switch ON	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

NG 

See step  6

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the transmission wire connector.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Result
   H66-8 (EGND) - Body ground	Ignition switch ON	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

See step  7

1. Disconnect the engine stop and start ECU connector.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Result
   H66-8 (EGND) - Body ground	Ignition switch ON	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU (EGND) - TRANSMISSION WIRE (EMP-))