Toyota Corolla Cross: Transmission Fluid Pressure Sensor/Switch "A" Circuit Short To Ground (P084011)

DESCRIPTION

The TCM performs learning control for the belt clamping pressure based on the belt clamping pressure signal, which is output by the oil pressure sensor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P084011	Transmission Fluid Pressure Sensor/Switch "A" Circuit Short To Ground	When 2 seconds or more have elapsed since engine start, a short to ground is detected in the oil pressure sensor circuit for 0.5 seconds or more (1-trip detection logic).	Wire harness or connector Oil pressure sensor TCM	Comes on	DTC stored	SAE Code: P0842

MONITOR DESCRIPTION

This DTC indicates a short to ground in the oil pressure sensor circuit. If there is a short to ground in the oil pressure sensor circuit, the TCM detects the malfunction, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs	P0842: Oil pressure sensor/Range check (Low voltage)
Required sensors/Components	Oil pressure sensor
Frequency of operation	Continuous
Duration	0.5 sec.
MIL operation	Immediate
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored	None
Starter	OFF
Auxiliary battery voltage	8 V or more
Ignition switch	ON

TYPICAL MALFUNCTION THRESHOLDS

Oil pressure sensor voltage

Less than 0.28 V

COMPONENT OPERATING RANGE

Oil pressure sensor voltage

0.28 V or more and 4.9 V or less

CONFIRMATION DRIVING PATTERN

HINT:

• After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
• When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

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1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
2. Turn the ignition switch off and wait for 2 minutes or more.
3. Turn the ignition switch to ON and turn the GTS on.
4. Start the engine and wait for 5 seconds or more. [*1]

   HINT:

   [*1]: Normal judgment procedure.

   The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

5. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
6. Input the DTC: P084011.
7. Check the DTC judgment result.

   GTS Display	Description
   NORMAL	DTC judgment completed System normal
   ABNORMAL	DTC judgment completed System abnormal
   INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
   N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

   HINT:

   • If the judgment result shows NORMAL, the system is normal.
   • If the judgment result shows ABNORMAL, the system has a malfunction.
   • If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

• Do not perform a stall test if there are any people or objects near the vehicle.
• The vehicle could begin moving suddenly, resulting in a serious accident.

• Do not perform a stall test if any wheel chock is out of position.
• The vehicle could begin moving suddenly, resulting in a serious accident.

• Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.
• The vehicle could begin moving suddenly, resulting in a serious accident.

NOTICE:

• Perform the universal trip to clear permanent DTCs.

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• Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.

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• Check that no DTCs are stored after performing initialization.

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PROCEDURE

1.	READ VALUE USING GTS (BELT CLAMPING FORCE SENSOR)

CAUTION:

A stall speed test should always be performed with at least 2 people. One person should observe the condition of the wheels and wheel chocks while the other is performing the test.

NOTICE:

• This test must be performed after checking and confirming that the engine is normal.
• Perform this test with the CVT fluid temperature between 50 and 100°C (122 and 212°F).
• Perform this test with the air conditioning off.
• Do not perform the stall speed test for longer than 5 seconds.
• When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.
• Perform this test with the AUTO function (shift-linked function) of the electric parking brake system off.

(a) Warm up the engine.

(b) Fully apply the parking brake and chock all 4 wheels.

HINT:

When the parking brake indicator (red) is illuminated after the electric parking brake switch (electric parking brake switch assembly) has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch (electric parking brake switch assembly) is pulled to the lock side one more time.

(c) Enter the following menus:

(d) According to the display on the GTS, perform the Active Test.

Powertrain > Transmission > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Activate the TC Terminal	Turn on and off TC and TE1 (CG) connection	ON or OFF	ON: TC and TE1 are connected. OFF: TC and TE1 are disconnected. (Vehicle Condition) Ignition switch to ON, engine stopped and shift lever in P

(e) Enter the following menus:

(f) According to the display on the GTS, read the Data List.

Powertrain > Transmission > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Belt Clamping Force Sensor	Secondary oil pressure value	Min.: -64 MPa Max.: 63.998 MPa	Secondary oil pressure inspection: 3.5 to 4.3 MPa (35.7 to 43.8 kgf/cm2, 508 to 624 psi): D position stall test 1.6 to 2.4 MPa (16.3 to 24.5 kgf/cm2, 232 to 348 psi): R position stall test	-

Powertrain > Transmission > Active Test

Active Test Display
Activate the TC Terminal

Data List Display
Belt Clamping Force Sensor

Result	Proceed to
Data List value is normal	A
Data List value is not normal	B

B

GO TO STEP 3

A

2.	REPLACE TCM

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NEXT

PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here for Initialization: Click here

3.	CHECK TCM (VCPT TERMINAL VOLTAGE)

(a) Disconnect the oil pressure sensor connector.

*a Front view of wire harness connector (to Oil Pressure Sensor)

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
C71-3 (VC) - C71-1 (E2)	Ignition switch ON	4.75 to 5.25 V

(d) Connect the oil pressure sensor connector.

NG

GO TO STEP 10

OK

4.	CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - TCM)

(a) Disconnect the C71 oil pressure sensor connector.

(b) Disconnect the C80 TCM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
C71-2 (PTO) - C80-50 (PTO)	Always	Below 1 Ω
C71-2 (PTO) or C80-50 (PTO) - Body ground and other terminals	Always	10 kΩ or higher

(d) Connect the C80 TCM connector.

(e) Connect the C71 oil pressure sensor connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (OIL PRESSURE SENSOR - TCM)

OK

5.	REPLACE OIL PRESSURE SENSOR

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NEXT

6.

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Transmission > Clear DTCs

NEXT

7.	PERFORM INITIALIZATION

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NEXT

8.	CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED (P084011)

(a) Start the engine and wait for 5 seconds or more.

(b) Enter the following menus:

(c) Read the DTCs.

Powertrain > Transmission > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTC P084011 is output	B

A

END

B

9.	REPLACE TCM

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NEXT

PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here for Initialization: Click here

10.	CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - TCM)

(a) Disconnect the C71 oil pressure sensor connector.

(b) Disconnect the C80 TCM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
C71-3 (VC) - C80-49 (VCPT)	Always	Below 1 Ω
C71-1 (E2) - C80-48 (EPTO)	Always	Below 1 Ω
C71-3 (VC) or C80-49 (VCPT) - Body ground and other terminals	Always	10 kΩ or higher
C71-1 (E2) or C80-48 (EPTO) - Body ground and other terminals	Always	10 kΩ or higher

(d) Connect the C80 TCM connector.

(e) Connect the C71 oil pressure sensor connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (OIL PRESSURE SENSOR - TCM)

OK

11.	REPLACE TCM

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here for Initialization: Click here

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