Toyota Corolla Cross: Auxiliary Transmission Fluid Pump Control Module Feedback Signal Circuit Short to Battery or Open (P0C2B15)

DESCRIPTION

Refer to DTC P0C2B11.

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DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate	Note
P0C2B15	Auxiliary Transmission Fluid Pump Control Module Feedback Signal Circuit Short to Battery or Open	Both of the following conditions are met for 1 second or more (2 trip detection logic): Engine started Oil pump with motor assembly circuit malfunction (Oil pump motor relay in the engine stop and start ECU stuck off, open or short to ground in the OP21, OPM1 or NOPM circuit or an open in the GND circuit)	Wire harness or connector Oil pump with motor assembly Engine stop and start ECU	Comes on (For Mexico Models: Does not come on)	Does not come on (For Mexico Models: Blinks)	SAE Code: P0C2E

CONFIRMATION DRIVING PATTERN

HINT:

• If the cable is disconnected from the auxiliary 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, by idling the engine for 5 to 60 minutes with the auxiliary battery fluid temperature at 11°C (52°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 auxiliary 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.

CONFIRMATION AFTER TROUBLESHOOTING

(a) Clear the DTCs.

Powertrain > Stop and Start > Clear DTCs

(b) Start the engine and warm it up.

(c) Drive the vehicle at 7 km/h (4.3 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) Keep the engine stopped 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.

(g) Check that no DTCs are output.

Powertrain > Stop and Start > Trouble Codes

STOP AND START SYSTEM OPERATION CHECK

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WIRING DIAGRAM

Refer to DTC P0C2B11.

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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, perform learning of the external backup boost converter (eco run vehicle converter assembly).

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

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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.

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• 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.

PROCEDURE

1.	PERFORM ACTIVE TEST USING GTS (OIL PUMP)

(a) Drive the vehicle to warm up the engine and CVT fluid.

HINT:

The oil pump with motor assembly may not operate properly if the CVT fluid temperature is low. Make sure to warm up the CVT fluid before performing the Active Test. (CVT fluid temperature: 25°C (77°F) or higher)

(b) Turn the ignition switch to ON.

HINT:

Do not start the engine.

(c) Enter the following menus.

Powertrain > Stop and Start > Active Test

Tester Display
Oil Pump

(d) Check the operating sound of the oil pump with motor assembly while performing the Active Test.

Standard:

Oil Pump	Result
ON	Operating sound can be heard
OFF	Operating sound cannot be heard

NG

GO TO STEP 5

OK

2.	CHECK ENGINE STOP AND START ECU (NOPM TERMINAL WAVEFORM)

*a

Component with harness connected (Engine Stop and Start ECU)

-

-

(a) Connect an oscilloscope to terminals NOPM and DGND of the engine stop and start ECU connector.

(b) Turn the ignition switch to ON.

HINT:

Do not start the engine.

(c) Enter the following menus.

Powertrain > Stop and Start > Active Test

Tester Display
Oil Pump

(d) Check the waveform while performing the Active Test. Item Condition Tester Connection A169-27 (NOPM) - A169-6 (DGND) Tool Setting 5 V/DIV., 5 ms./DIV. Condition Ignition switch ON (engine is stopped) Active Test "Oil Pump" being performed Standard: The waveform is similar to that shown in the illustration with no noise.

OK

REPLACE ENGINE STOP AND START ECU

NG

3.	CHECK OIL PUMP (OPST TERMINAL VOLTAGE)

(a) Disconnect the C134 oil pump with motor assembly connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
C134-2 (OPST) - C134-1 (GND)	Ignition switch ON	10 to 14 V

OK

REPLACE OIL PUMP (CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY) for 2WD: Click here for AWD: Click here

NG

4.	CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - OIL PUMP WITH MOTOR ASSEMBLY)

(a) Disconnect the A169 engine stop and start ECU connector.

(b) Disconnect the C134 oil pump with motor assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A169-27 (NOPM) - C134-2 (OPST)	Always	Below 1 Ω
A169-27 (NOPM) - Body ground and other terminals	Always	10 kΩ or higher
C134-2 (OPST) - Body ground and other terminals	Always	10 kΩ or higher

OK

REPLACE ENGINE STOP AND START ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - OIL PUMP WITH MOTOR ASSEMBLY)

(a) Disconnect the A168 engine stop and start ECU connector.

(b) Disconnect the C134 oil pump with motor assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A168-6 (OP21) - C134-4 (+B)	Always	Below 1 Ω
A168-6 (OP21) - Body ground and other terminals	Always	10 kΩ or higher
C134-4 (+B) - Body ground and other terminals	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.	CHECK HARNESS AND CONNECTOR (OIL PUMP WITH MOTOR ASSEMBLY - BODY GROUND)

(a) Disconnect the C134 oil pump with motor assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
C134-1 (GND) - Body ground	Always	Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.	CHECK ENGINE STOP AND START ECU (OP21 TERMINAL VOLTAGE)

*a

Component with harness connected (Engine Stop and Start ECU)

-

-

(a) Disconnect the C134 oil pump with motor assembly connector.

(b) Turn the ignition switch to ON.

HINT:

Do not start the engine.

(c) Enter the following menus.

Powertrain > Stop and Start > Active Test

Tester Display
Oil Pump

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A168-6 (OP21) - A169-6 (DGND)	Ignition switch ON (engine is stopped) Active Test "Oil Pump" being performed	10.5 to 16 V

NG

REPLACE ENGINE STOP AND START ECU

OK

8.	CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - OIL PUMP WITH MOTOR ASSEMBLY)

(a) Disconnect the A169 engine stop and start ECU connector.

(b) Disconnect the C134 oil pump with motor assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A169-9 (OPMI) - C134-3 (SI)	Always	Below 1 Ω
A169-9 (OPMI) - Body ground and other terminals	Always	10 kΩ or higher
C134-3 (SI) - Body ground and other terminals	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.	CHECK OIL PUMP WITH MOTOR ASSEMBLY (OPM1 TERMINAL WAVEFORM)

(a) Connect an oscilloscope to the OPM1 and DGND terminals of the engine stop and start ECU connector.

*a

Component with harness connected (Engine Stop and Start ECU)

-

-

(b) Turn the ignition switch to ON.

HINT:

Do not start the engine.

(c) Enter the following menus.

Powertrain > Stop and Start > Active Test

Tester Display
Oil Pump

(d) Check the waveform while performing the Active Test. Item Condition Tester Connection A169-9 (OPM1) - A169-6 (DGND) Tool Setting 5 V/DIV., 5 ms./DIV. Condition Ignition switch ON (engine is stopped) Active Test "Oil Pump" being performed Standard: The waveform is similar to that shown in the illustration with no noise.

OK

REPLACE ENGINE STOP AND START ECU

NG

REPLACE OIL PUMP (CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY) for 2WD: Click here for AWD: Click here

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