- DTC judgment completed
- System normal
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000002B35Q |
| Model Year Start: 2023 | Model: Corolla Hatchback | Prod Date Range: [03/2023 - ] |
| Title: K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P084011; Transmission Fluid Pressure Sensor/Switch "A" Circuit Short To Ground; 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 - ] | ||
|
DTC |
P084011 |
Transmission Fluid Pressure Sensor/Switch "A" Circuit Short To Ground |
DESCRIPTION
The ECM 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 |
DTC Output from |
Priority |
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). |
|
Comes on |
Engine |
A |
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 ECM 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
|
Starter |
OFF |
|
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.
Click here
![2023 - 2025 MY Corolla Corolla Hatchback [03/2023 - ]; K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for 2 minutes or more.
-
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.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P084011.
-
Check the DTC judgment result.
GTS Display
Description
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.
Click here
-
Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.
Click here
-
Check that no DTCs are stored after performing initialization.
Click here
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.
Pre-procedure1
(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.
Procedure1
(c) According to the display on the GTS, perform the Active Test.
Powertrain > Engine > 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 |
(Vehicle Condition)
|
(d) According to the display on the GTS, read the Data List.
Powertrain > Engine > 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: 3.0 to 7.0 MPa (30.6 to 71.4 kgf/cm2, 435 to 1015 psi): D position stall test |
- |
Powertrain > Engine > Active Test
|
Active Test Display |
|---|
|
Activate the TC Terminal |
|
Data List Display |
|---|
|
Belt Clamping Force Sensor |
|
Result |
Proceed to |
|---|---|
|
The value of Belt Clamping Force Sensor is 3.0 MPa or more, and 7.0 MPa or less |
A |
|
The value of Belt Clamping Force Sensor is more than 7.0 MPa, or less than 3.0 MPa |
B |
HINT:
- 3.0 MPa = 30.6 kgf/cm2, 435 psi
- 7.0 MPa = 71.4 kgf/cm2, 1015 psi
Post-procedure1
(e) None
| B |
|
|
|
2. |
REPLACE ECM |
HINT:
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
3. |
CHECK ECM (VCPT TERMINAL VOLTAGE) |
Pre-procedure1
(a) Disconnect the C71 oil pressure sensor connector.
(b) Turn the ignition switch to ON.
Procedure1
(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 |
Post-procedure1
(d) Turn the ignition switch off.
(e) Connect the C71 oil pressure sensor connector.
| NG |
|
|
|
4. |
CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - ECM) |
Pre-procedure1
(a) Disconnect the C71 oil pressure sensor connector.
(b) Disconnect the C160 ECM connector.
Procedure1
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C71-2 (PTO) - C160-122 (PTO) |
Always |
Below 1 Ω |
|
C71-2 (PTO) or C160-122 (PTO) - Body ground and other terminals |
Always |
10 kΩ or higher |
Post-procedure1
(d) Connect the C160 ECM connector.
(e) Connect the C71 oil pressure sensor connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (OIL PRESSURE SENSOR - ECM) |
|
|
5. |
REPLACE OIL PRESSURE SENSOR |
HINT:
Click here
|
|
6. |
CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs
|
|
7. |
PERFORM INITIALIZATION |
HINT:
Click here
|
|
8. |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED (P084011) |
(a) Read the DTCs.
Powertrain > Engine > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
P084011 is output |
B |
| A |
|
END |
|
|
9. |
REPLACE ECM |
HINT:
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
10. |
CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - ECM) |
Pre-procedure1
(a) Disconnect the C71 oil pressure sensor connector.
(b) Disconnect the C160 ECM connector.
Procedure1
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C71-3 (VC) - C160-121 (VCPT) |
Always |
Below 1 Ω |
|
C71-1 (E2) - C160-120 (EPTO) |
Always |
Below 1 Ω |
|
C71-3 (VC) or C160-121 (VCPT) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
C71-1 (E2) or C160-120 (EPTO) - Body ground and other terminals |
Always |
10 kΩ or higher |
Post-procedure1
(d) Connect the C160 ECM connector.
(e) Connect the C71 oil pressure sensor connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (OIL PRESSURE SENSOR - ECM) |
|
|
11. |
REPLACE ECM |
HINT:
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
|