DTC P2796-14: Electromagnetic Oil Pump Circuit Open [12/2024 - ]: Procedure

Pre-procedure1

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

  Powertrain > Stop and Start > Utility 

  Tester Display
  Vehicle Control History (RoB)

• 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

Post-procedure1

• None.

Result: 

B 

See step  9

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	Result
   K70-9 (EMOP) - Body ground	Always	10 kΩ or higher	kΩ

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  7

Result: 

OK 

See step  3

Pre-procedure1

• Disconnect the engine stop and start ECU connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  K70-9 (EMOP) - K70-8 (EGND)	20°C (68°F)	5.0 to 5.6 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

NG 

See step  5

Result: 

OK 

See step  4

Pre-procedure1

• Disconnect the engine stop and start ECU connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a

  Component without harness connected (Engine Stop and Start ECU)

  -

  -

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  K70-9 (EMOP) - K70-8 (EGND)	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

GO TO BACKUP BOOST CONVERTER CIRCUIT 

Refer to Backup Boost Converter Circuit [12/2024 - ]

Result: 

NG 

REPLACE ENGINE STOP AND START ECU ASSEMBLY 

Refer to REMOVAL [12/2024 - ]

Pre-procedure1

• Disconnect the engine stop and start ECU connector.
• Disconnect the transmission wire connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  K70-8 (EGND) - F26-10 (EMP-)	Always	Below 1 Ω	Ω
  K70-9 (EMOP) - F26-9 (EMP+)	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Inspect the transmission wire.

   Refer to INSPECTION [12/2024 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE OIL PUMP WITH SOLENOID ASSEMBLY 

Refer to PROCEDURE - Step 13

Result: 

NG 

REPLACE TRANSMISSION WIRE 

Refer to REMOVAL [12/2024 - ]

Pre-procedure1

• Disconnect the transmission wire connector.

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

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a

  Component with harness connected (Engine Stop and Start ECU)

  -

  -

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  K70-9 (EMOP) - Body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

REPLACE TRANSMISSION WIRE 

Refer to REMOVAL [12/2024 - ]

Result: 

NG 

See step  8

Pre-procedure1

• Disconnect the engine stop and start ECU connector.
• Disconnect the transmission wire connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  K70-9 (EMOP) or F26-9 (EMP+) - Body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

REPLACE ENGINE STOP AND START ECU ASSEMBLY 

Refer to REMOVAL [12/2024 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Pre-procedure1

• Turn the ignition switch to ON.

  HINT: 

  Do not start the engine.

• Turn the GTS on.
• Connect an oscilloscope to the EGND and GND1 terminals of the engine stop and start ECU connectors.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a

  Component with harness connected (Engine Stop and Start ECU)

  -

  -

• Check the waveform while performing the Active Test.

  Powertrain > Stop and Start > Active Test 

  Tester Display
  Electromagnetic Oil Pump

  Item	Condition
  Tester Connection	K70-8 (EGND) - A23-8 (GND1)
  Tool Setting	10 V/DIV., 20 ms./DIV.
  Condition	Ignition switch ON (engine is stopped) Active Test "Electromagnetic Oil Pump" being performed

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  Standard

  The waveform is similar to that shown in the illustration.

  Result

  Result	Proceed to
  Constant value below 1 V	A
  Constant value between 10 to 14 V	B
  Waveform output as in illustration	C

Post-procedure1

• None.

Result: 

B 

REPLACE ENGINE STOP AND START ECU ASSEMBLY 

Refer to REMOVAL [12/2024 - ]

Result: 

C 

USE SIMULATION METHOD TO CHECK 

Refer to HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS

Result: 

A 

See step  10

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	Result
   K70-8 (EGND) - Body ground	Always	10 kΩ or higher	kΩ

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  14

Result: 

OK 

See step  11

Pre-procedure1

• Disconnect the transmission wire connector.
• Turn the ignition switch to ON.

  HINT: 

  Do not start the engine.

• Measure the voltage according to the value(s) in the table below.

  Powertrain > Stop and Start > Active Test 

  Tester Display
  Electromagnetic Oil Pump

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  F26-9 (EMP+) - Body ground	Ignition switch ON (engine is stopped) Active Test "Electromagnetic Oil Pump" being performed	10 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

NG 

See step  13

Result: 

OK 

See step  12

Pre-procedure1

• Disconnect the transmission wire connector.

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

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Component without harness connected (Transmission Wire)

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  F26-9 (EMP+) - F26-10 (EMP-)	20°C (68°F)	5.0 to 5.6 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

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

Result: 

NG 

See step  6

Pre-procedure1

• Disconnect the transmission wire connector.
• Turn the ignition switch to ON.

  HINT: 

  Do not start the engine.

• Measure the voltage according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a

  Component with harness connected (Engine Stop and Start ECU)

  -

  -

  Powertrain > Stop and Start > Active Test 

  Tester Display
  Electromagnetic Oil Pump

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  K70-9 (EMOP) - Body ground	Ignition switch ON (engine is stopped) Active Test "Electromagnetic Oil Pump" being performed	10 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

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

Result: 

NG 

REPLACE ENGINE STOP AND START ECU ASSEMBLY 

Refer to REMOVAL [12/2024 - ]

Pre-procedure1

• Disconnect the engine stop and start ECU connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  K70-8 (EGND) - Body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

REPLACE ENGINE STOP AND START ECU ASSEMBLY 

Refer to REMOVAL [12/2024 - ]

Result: 

NG 

See step  15

Pre-procedure1

• Disconnect the engine stop and start ECU connector.
• Disconnect the transmission wire connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  K70-8 (EGND) or F26-10 (EMP-) - Body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

REPLACE TRANSMISSION WIRE 

Refer to REMOVAL [12/2024 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR