STOP AND START: STOP AND START SYSTEM: P279796; Electromagnetic Oil Pump Component Internal Failure; 2020 - 2023 MY RAV4 [10/2019

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001KNEA
Model Year Start: 2020	Model: RAV4	Prod Date Range: [10/2019 - 10/2023]
Title: STOP AND START: STOP AND START SYSTEM: P279796; Electromagnetic Oil Pump Component Internal Failure; 2020 - 2023 MY RAV4 [10/2019 - 10/2023]

DTC

P279796

Electromagnetic Oil Pump Component Internal Failure

DESCRIPTION

Refer to DTC P279612.

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DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Memory	Note
P279796	Electromagnetic Oil Pump Component Internal Failure	One of the following conditions are met for 0.21 seconds or more (2 trip detection logic): Oil pump with solenoid assembly operating (Tr1: On, Tr2: On). Either of the following conditions is met: EGND terminal voltage 10 V or higher. EGND terminal voltage below 1 V.	Wire harness or connector Transmission wire Oil pump with solenoid assembly Engine stop and start solenoid filter Engine stop and start ECU	Blinks	DTC stored	SAE Code: P2797

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.

(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.

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

Refer to DTC P279612.

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

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.
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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.
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PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P279796)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to 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 P279796 is output	A
DTCs P279796 and P323A19 are output	B

REPLACE ENGINE STOP AND START ECU

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

*a	Front view of wire harness connector (to Engine Stop and Start ECU)

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A32-9 (EMOP) - A32-8 (EGND)	20°C (68°F)	5.0 to 5.6 Ω

REPLACE ENGINE STOP AND START ECU

3.	CHECK ENGINE STOP AND START ECU

Component without harness connected

(Engine Stop and Start ECU)

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

(b) Disconnect the transmission wire connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A32-9 (EMOP) - A32-8 (EGND)	Always	10 kΩ or higher

GO TO STEP 5

4.	INSPECT OIL PUMP WITH SOLENOID ASSEMBLY

(a) Inspect the oil pump with solenoid assembly.

for 2WD:
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for AWD:
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REPLACE TRANSMISSION WIRE

for 2WD:
Click here
for AWD:
Click here

REPLACE OIL PUMP WITH SOLENOID ASSEMBLY

for 2WD:
Click here
for AWD:
Click here

5.	INSPECT ENGINE STOP AND START SOLENOID FILTER

(a) Remove the engine stop and start solenoid filter.

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*a	Component without harness connected (Engine Stop and Start Solenoid Filter)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (MOP+) - 1 (MOP-)	Always	10 kΩ or higher
7 (MOPI) - 8 (GND)	Always	10 kΩ or higher

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

REPLACE ENGINE STOP AND START SOLENOID FILTER