Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001EEKI
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 - 10/2019]
Title: STOP AND START: STOP AND START SYSTEM: P279612; Electromagnetic Oil Pump Circuit Short to Battery; 2019 MY RAV4 [11/2018 - 10/2019]

DTC

P279612

Electromagnetic Oil Pump Circuit Short to Battery

DESCRIPTION

The oil pump with solenoid assembly is installed inside the automatic transaxle assembly.

The oil pump with solenoid assembly operates from the time the engine is stopped due to stop and start control until the vehicle starts moving again in order to ensure oil pressure within the automatic transaxle assembly and allow for a smooth start-off.

The engine stop and start ECU supplies power from the backup boost converter to the oil pump with solenoid assembly through Tr1 and performs Tr2 duty control to operate the oil pump with solenoid assembly.

The engine stop and start ECU performs Tr1 and Tr2 control when operating or not operating the oil pump with solenoid assembly and during the preliminary check, and also monitors the EGND terminal to record DTCs.

As a preliminary check, the first time the vehicle speed reaches 2 km/h (1.2 mph) or more on each trip and every time the vehicle speed reaches 2 km/h (1.2 mph) or more after stop and start control is performed, the engine stop and start ECU turns Tr1 ON and checks that there are no malfunctions in the oil pump with solenoid assembly circuit.

The engine stop and start solenoid filter absorbs high-voltage counter-electromotive force generated when the oil pump with solenoid assembly operates.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

Note

P279612

Electromagnetic Oil Pump Circuit Short to Battery

Both of the following conditions are met for 2 seconds or more (1 trip detection logic):

  • Oil pump with solenoid assembly not operating (Tr1: Off, Tr2: Off).
  • EGND terminal voltage 10 V or higher.
  • Wire harness or connector
  • Transmission wire
  • Engine stop and start ECU

Blinks

DTC stored

SAE Code: P2799

CONFIRMATION DRIVING PATTERN

CONFIRMATION AFTER TROUBLESHOOTING

HINT:

  • If the cable is disconnected from the battery terminal, stop and start control is prohibited until refresh charge is completed.

    In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item "Status of Battery Charge Control" changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery fluid temperature at 11°C (51°F) or higher, the refresh charge will be completed.)

  • If the Techstream is not available and the Data List item "Status of Battery Charge Control" cannot be checked, charge the battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

    If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

  • After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.
  • Allow the engine to idle for 3 minutes after it is warmed up and check that the engine idle speed is within 50 rpm of the target idle speed.

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Stop and Start > Clear DTCs

(e) Start the engine and warm it up.

(f) Drive the vehicle at 7 km/h (4 mph) or more.

CAUTION:

When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.

(g) Depress the brake pedal and stop the vehicle.

(h) Keep the engine stopped by stop and start control. (Keep the shift lever in D.)

(i) Release the brake pedal with the shift lever in D to start the engine.

(j) Check that no DTCs are output.

Powertrain > Stop and Start > Trouble Codes

STOP AND START SYSTEM OPERATION CHECK

HINT:

  • If the cable is disconnected from the battery terminal, stop and start control is prohibited until refresh charge is completed.

    In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item "Status of Battery Charge Control" changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery fluid temperature at 11°C (51°F) or higher, the refresh charge will be completed.)

  • If the Techstream is not available and the Data List item "Status of Battery Charge Control" cannot be checked, charge the battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

    If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

  • After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.

(a) Start the engine and warm it up.

(b) Turn the air conditioning system off.

(c) Drive the vehicle at 7 km/h (4 mph) or more.

CAUTION:

When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.

(d) Depress the brake pedal and stop the vehicle.

(e) Allow the engine to stop by stop and start control. (Keep the shift lever in D.)

(f) Release the brake pedal with the shift lever in D to start the engine.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.

    Click here 2019 MY RAV4 [11/2018 - 10/2019]; STOP AND START: STOP AND START SYSTEM: REGISTRATION

  • After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.

    Click here 2019 MY RAV4 [11/2018 - 10/2019]; STOP AND START: STOP AND START SYSTEM: REGISTRATION

  • After replacing the engine stop and start ECU or airbag ECU assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

    Click here 2019 MY RAV4 [11/2018 - 10/2019]; STOP AND START: STOP AND START SYSTEM: REGISTRATION

  • When the engine stop and start ECU or oil pump with solenoid assembly is replaced, check the oil pump with solenoid assembly.

    Click here 2019 MY RAV4 [11/2018 - 10/2019]; STOP AND START: STOP AND START SYSTEM: REGISTRATION

HINT:

  • Using the Techstream, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.

    Click here 2019 - 2021 MY RAV4 [11/2018 - 12/2021]; STOP AND START: STOP AND START SYSTEM: FREEZE FRAME DATA

  • DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.

    Click here 2019 - 2023 MY RAV4 [11/2018 - 10/2023]; STOP AND START: STOP AND START SYSTEM: DTC CHECK / CLEAR

PROCEDURE

1.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P279612)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Stop and Start / Trouble Codes.

(e) Read the DTCs

Powertrain > Stop and Start > Trouble Codes

Result

Proceed to

DTC P279612 is output

A

DTCs P279612 and P323A19 are output

B
B

GO TO STEP 5

A

2.

CHECK HARNESS AND CONNECTOR (EGND TERMINAL VOLTAGE)

*a

Component with harness connected

(Engine Stop and Start ECU)

-

-

(a) Turn the ignition switch to ON.

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

Tester Connection

Condition

Result

Proceed to

A32-8 (EGND) - Body ground

Ignition switch ON

10 to 14 V

A

Below 1 V

B
B

USE SIMULATION METHOD TO CHECK

A

3.

CHECK HARNESS AND CONNECTOR (EGND TERMINAL VOLTAGE)

*a

Component with harness connected

(Engine Stop and Start ECU)

-

-

(a) Disconnect the transmission wire connector.

(b) Turn the ignition switch to ON.

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

Tester Connection

Condition

Result

Proceed to

A32-8 (EGND) - Body ground

Ignition switch ON

10 to 14 V

A

Below 1 V

B
B

REPLACE TRANSMISSION WIRE

A

4.

CHECK HARNESS AND CONNECTOR (EGND TERMINAL VOLTAGE)

*a

Front view of wire harness connector

(to Engine Stop and Start ECU)

(a) Disconnect the engine stop and start ECU connector.

(b) Turn the ignition switch to ON.

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

Tester Connection

Condition

Result

Proceed to

A32-8 (EGND) - Body ground

Ignition switch ON

10 to 14 V

A

Below 1 V

B
A

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

REPLACE ENGINE STOP AND START ECU

5.

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - OTHER TERMINALS)

*a

Component with harness connected

(Engine Stop and Start ECU)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A32-9 (EMOP) - Other terminals*

Always

10 kΩ or higher
  • *: Except A32-8 (GND1) terminal
OK

GO TO DTC P323A19

NG

6.

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - OTHER TERMINALS)

*a

Component with harness connected

(Engine Stop and Start ECU)

-

-

(a) Disconnect the transmission wire connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A32-9 (EMOP) - Other terminals

Always

10 kΩ or higher
OK

REPLACE TRANSMISSION WIRE

NG

7.

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - TRANSMISSION WIRE)

(a) Disconnect the engine stop and start ECU connector.

(b) Disconnect the transmission wire connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A32-9 (EMOP) - Other terminals

Always

10 kΩ or higher
OK

REPLACE ENGINE STOP AND START ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR