DTC P2796-12: Electromagnetic Oil Pump Circuit Short To Battery [11/2021 - 03/2023]: Procedure

1. Read the DTCs

   Powertrain > Stop and Start > Trouble Codes 

   Result

   Result	Proceed to
   DTC P2796-12 is output	A
   DTCs P2796-12 and P323A-19 are output	B

Result: 

B 

See step  5

Result: 

A 

See step  2

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.

   Result

   Tester Connection	Condition	Result
   D40-8 (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 [11/2021 - ] 

Result: 

NG 

See step  3

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.

   Result

   Tester Connection	Condition	Result
   D40-8 (EGND) - Body ground	Ignition switch ON	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE TRANSMISSION WIRE 

for A25A-FKS: Refer to REMOVAL [11/2021 - ]

for T24A-FTS: Refer to REMOVAL [11/2021 - ]

Result: 

NG 

See step  4

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.

   Result

   Tester Connection	Condition	Result
   D40-8 (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 [11/2021 - ] 

Result: 

NG 

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

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
   D40-9 (EMOP) - Other terminals*	Always	10 kΩ or higher

   1. *: Except A28-8 (GND1) terminal

   Result

   Proceed to
   OK
   NG

Result: 

OK 

GO TO DTC P323A-19. Refer to  DTC P323A-19: Backup Boost Converter "A" Circuit Current Above Threshold [11/2021 - 03/2023]  

Result: 

NG 

See step  6

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
   D40-9 (EMOP) - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE TRANSMISSION WIRE 

for A25A-FKS: Refer to REMOVAL [11/2021 - ]

for T24A-FTS: Refer to REMOVAL [11/2021 - ]

Result: 

NG 

See step  7

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
   D40-9 (EMOP) or B39-29 (EMP+) - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [11/2021 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR