RM35X0E _51 Engine / Hybrid System _078825 STOP AND START _0382334 STOP AND START SYSTEM C

STOP AND START  STOP AND START SYSTEM  P279612  Electromagnetic Oil Pump Circuit Short to Battery  


DESCRIPTION

HINT:

This DTC is applicable to Automatic Transmission models only.


The electromagnetic oil pump is installed inside the automatic transmission assembly.

The electromagnetic oil pump 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 transmission assembly and allow for a smooth start-off.

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

The engine stop and start ECU performs Tr1 and Tr2 control when operating or not operating the electromagnetic oil pump 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 electromagnetic oil pump circuit.

The engine stop and start solenoid filter absorbs high-voltage counter-electromotive force generated when the electromagnetic oil pump 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):
·

Electromagnetic oil pump 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 GTS 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 GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Clear the DTCs.

Powertrain > Stop and Start > Clear DTCs
50002 392

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
50001 392


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 GTS 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

A349089E21
0.406,3.271 2.135,3.5 1.729,0.229 10 false Engine Stop and Start ECU 2.042,2.188 2.656,2.385 0.615,0.198 10 false EGND 0.542,2.271 1,2.469 0.458,0.198 10 false Tr2 0.479,1.542 0.938,1.74 0.458,0.198 10 false Tr1 2.031,1.5 2.646,1.698 0.615,0.198 10 false EMOP 2.688,1.417 2.844,1.615 0.156,0.198 10 false 9 2.698,2.073 2.854,2.271 0.156,0.198 10 false 8 3.781,1.5 3.938,1.698 0.156,0.198 10 false 7 3.771,2.146 3.927,2.344 0.156,0.198 10 false 8 4.031,1.531 4.646,1.729 0.615,0.198 10 false MOPI 4.99,1.51 5.604,1.708 0.615,0.198 10 false MOP+ 5.531,1.5 5.688,1.698 0.156,0.198 10 false 2 4.052,2.177 4.667,2.375 0.615,0.198 10 false GND 5.021,2.167 5.635,2.365 0.615,0.198 10 false MOP- 5.531,2.156 5.688,2.354 0.156,0.198 10 false 1 3.833,2.781 4.292,2.979 0.458,0.198 10 false N73 3.844,2.979 6.281,3.292 2.438,0.313 10 false Engine Stop and Start Solenoid Filter 5.344,4.823 5.958,5.021 0.615,0.198 10 false EMP+ 5.844,4.823 6.156,5.021 0.313,0.198 10 false 17 5.833,4.167 6.146,4.365 0.313,0.198 10 false 27 5.344,4.188 5.958,4.385 0.615,0.198 10 false EMP- 4.563,4.844 4.719,5.042 0.156,0.198 10 false 2 4.573,4.177 4.729,4.375 0.156,0.198 10 false 1 4.917,5.469 5.375,5.667 0.458,0.198 10 false E29 4.917,5.677 6.615,5.906 1.698,0.229 10 false Transmission Wire 2.135,4.75 3.958,5 1.823,0.25 10 false Electromagnetic Oil Pump 2.073,2.802 2.688,3 0.615,0.198 10 false GND1 2.604,2.802 3.063,3 0.458,0.198 10 false N31 2.677,2.583 2.833,2.781 0.156,0.198 10 false 8 2.604,1.646 3.063,1.844 0.458,0.198 10 false N33 2.604,2.292 3.063,2.49 0.458,0.198 10 false N33 0.417,0.646 1.969,0.854 1.552,0.208 10 false Backup Boost Converter

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 hereEngine / Hybrid System>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 hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>REGISTRATION

·

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

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>REGISTRATION

·

When the engine stop and start ECU or electromagnetic oil pump is replaced, check the electromagnetic oil pump.

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>REGISTRATION



HINT:
·

Using the GTS, 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 hereEngine / Hybrid System>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 hereEngine / Hybrid System>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 GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

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


e.

Read the DTCs

Powertrain > Stop and Start > Trouble Codes
50001 392
Result:
Result Proceed to
DTC P279612 is output A
DTCs P279612 and P323A19 are output B




A

2.CHECK HARNESS AND CONNECTOR (EGND TERMINAL VOLTAGE)

B

5.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - OTHER TERMINALS)
2.CHECK HARNESS AND CONNECTOR (EGND TERMINAL VOLTAGE)
A419453C75
4.677,0.49 5.125,0.76 0.448,0.271 4.542,2.229 4.781,1.448 true 4.344,2.26 5,2.448 0.656,0.188 10 false EGND 4.781,0.542 5.156,0.74 0.375,0.198 10 false N33 0.104,0.073 0.885,0.271 0.781,0.198 10 false *a
*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.

Result:
Tester Connection Condition Result Proceed to
N33-8 (EGND) - Body ground Ignition switch ON 10 to 14 V A
Below 1 V B




A

3.CHECK HARNESS AND CONNECTOR (EGND TERMINAL VOLTAGE)

B

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


3.CHECK HARNESS AND CONNECTOR (EGND TERMINAL VOLTAGE)
A419453C75
4.677,0.49 5.125,0.76 0.448,0.271 4.542,2.229 4.781,1.448 true 4.344,2.26 5,2.448 0.656,0.188 10 false EGND 4.781,0.542 5.156,0.74 0.375,0.198 10 false N33 0.104,0.073 0.885,0.271 0.781,0.198 10 false *a
*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.

Result:
Tester Connection Condition Result Proceed to
N33-8 (EGND) - Body ground Ignition switch ON 10 to 14 V A
Below 1 V B




A

4.CHECK HARNESS AND CONNECTOR (EGND TERMINAL VOLTAGE)

B

REPLACE TRANSMISSION WIRE

Click hereDrivetrain>AC60E (AUTOMATIC TRANSMISSION / TRANSAXLE)>TRANSMISSION WIRE>REMOVAL


4.CHECK HARNESS AND CONNECTOR (EGND TERMINAL VOLTAGE)
A436064C14
1.49,0.406 2,0.708 0.51,0.302 1.906,1.344 1.958,1.844 true 1.625,0.49 2.073,0.667 0.448,0.177 10 false N33 0.094,0.104 0.406,0.302 0.313,0.198 10 false *a 1.792,1.896 2.406,2.094 0.615,0.198 10 false EGND
*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.

Result:
Tester Connection Condition Result Proceed to
N33-8 (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

Click hereEngine / Hybrid System>STOP AND START>ENGINE STOP AND START ECU>REMOVAL


5.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - OTHER TERMINALS)
A419453C76
4.688,0.49 5.135,0.76 0.448,0.271 4.458,2.229 4.698,1.448 true 4.25,2.26 4.906,2.448 0.656,0.188 10 false EMOP 4.792,0.542 5.167,0.74 0.375,0.198 10 false N33 0.104,0.073 0.885,0.271 0.781,0.198 10 false *a
*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
N33-9 (EMOP) - Other terminals* Always 10 kΩ or higher


*: Except N33-8 (EGND) terminal


Result:
Proceed to
OK
NG



OK

GO TO DTC P323A19

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>P323A19


NG

6.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - OTHER TERMINALS)
6.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - OTHER TERMINALS)
A419453C76
4.688,0.49 5.135,0.76 0.448,0.271 4.458,2.229 4.698,1.448 true 4.25,2.26 4.906,2.448 0.656,0.188 10 false EMOP 4.792,0.542 5.167,0.74 0.375,0.198 10 false N33 0.104,0.073 0.885,0.271 0.781,0.198 10 false *a
*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
N33-9 (EMOP) - Other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE TRANSMISSION WIRE

Click hereDrivetrain>AC60E (AUTOMATIC TRANSMISSION / TRANSAXLE)>TRANSMISSION WIRE>REMOVAL


NG

7.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - TRANSMISSION WIRE)
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
N33-9 (EMOP) - Other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ENGINE STOP AND START ECU

Click hereEngine / Hybrid System>STOP AND START>ENGINE STOP AND START ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR