- DTC judgment completed
- System normal
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001GYSO |
| Model Year Start: 2020 | Model: Corolla Hatchback | Prod Date Range: [01/2019 - 11/2022] |
| Title: K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P0842,P0843; Transmission Fluid Pressure Sensor/Switch "A" Circuit Low; 2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022] | ||
|
DTC |
P0842 |
Transmission Fluid Pressure Sensor/Switch "A" Circuit Low |
|
DTC |
P0843 |
Transmission Fluid Pressure Sensor/Switch "A" Circuit High |
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 |
Memory |
|---|---|---|---|---|---|
|
P0842 |
Transmission Fluid Pressure Sensor/Switch "A" Circuit Low |
When 2 seconds or more have elapsed since engine start, there is a short to ground in the oil pressure sensor circuit for 0.5 seconds (1-trip detection logic). |
|
Comes on |
DTC stored |
|
P0843 |
Transmission Fluid Pressure Sensor/Switch "A" Circuit High |
When 2 seconds or more have elapsed since engine start, there is an open or a short to +B in the oil pressure sensor circuit for 0.5 seconds (1-trip detection logic). |
|
Comes on |
DTC stored |
MONITOR DESCRIPTION
These DTCs indicate an open or short in the oil pressure sensor circuit. If there is an open or short 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) P0843: Oil pressure sensor / Range check (High voltage) |
|
Required sensors/Components |
Oil pressure sensor |
|
Frequency of operation |
Continuous |
|
Duration |
0.5 seconds |
|
MIL operation |
Immediately |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
|
The monitor will run whenever the following DTCs are not present |
None |
|
Starter |
OFF |
|
Time after starter ON to OFF |
2 seconds or more |
|
Battery voltage |
8 V or more |
|
Time after battery voltage is 8 V or more |
0.5 seconds or more |
|
Write inhibit |
Permit |
|
Time after write status forbiddance to permit |
0.5 seconds or more |
|
Ignition switch |
ON |
|
Time after ignition switch OFF to ON |
0.5 seconds or more |
TYPICAL MALFUNCTION THRESHOLDS
P0842:
|
Oil pressure sensor output voltage |
Less than 0.28 V |
P0843:
|
Oil pressure sensor output voltage |
More than 4.9 V |
COMPONENT OPERATING RANGE
|
Oil pressure sensor output voltage |
0.28 to 4.9 V |
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
![2020 - 2023 MY Corolla Corolla Hatchback [01/2019 - 11/2022]; K313 (CVT): CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- 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.
- Turn the ignition switch to ON and turn the Techstream on.
-
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 and ECT / Utility / All Readiness.
- Input the DTC: P0842 or P0843.
-
Check the DTC judgment result.
Techstream 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 chocks are 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 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 TECHSTREAM (A/T OIL PRESSURE) |
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 more than 5 seconds.
- When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.
-
w/ Electric Parking Brake System:
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:
w/ Electric Parking Brake System:
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) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Connect the TC and TE1.
Powertrain > Engine and ECT > Active Test
|
Active Test Display |
|---|
|
Connect the TC and TE1 |
|
Data List Display |
|---|
|
A/T Oil Pressure |
(g) According to the display on the Techstream, perform the Active Test.
(h) According to the display on the Techstream, read the Data List.
Powertrain > Engine and ECT > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
A/T Oil Pressure |
Secondary oil pressure value |
Min.: -64 MPa Max.: 63.998 MPa |
Secondary oil pressure inspection:
|
- |
|
Result |
Proceed to |
|---|---|
|
Data List value is normal |
A |
|
Data List value is not normal |
B |
| B |
|
|
|
2. |
REPLACE ECM |
(a) Replace the ECM.
Click here
| NEXT |
|
|
3. |
CHECK ECM (VCPT TERMINAL VOLTAGE) |
|
(a) Disconnect the C72 oil pressure sensor connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C72-3 (VC) - C72-1 (E2) |
Ignition switch ON |
4.75 to 5.25 V |
(c) Connect the C72 oil pressure sensor connector.
| NG |
|
|
|
4. |
CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - ECM) |
(a) Disconnect the C72 oil pressure sensor connector.
(b) Disconnect the C77 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C72-2 (PTO) - C77-79 (PTO) |
Always |
Below 1 Ω |
|
C72-2 (PTO) or C77-79 (PTO) - Body ground and other terminals |
Always |
10 kΩ or higher |
(d) Connect the C77 ECM connector.
(e) Connect the C72 oil pressure sensor connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (OIL PRESSURE SENSOR - ECM) |
|
|
5. |
REPLACE OIL PRESSURE SENSOR |
(a) Replace the oil pressure sensor.
Click here
|
|
6. |
CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine and ECT > Clear DTCs
|
|
7. |
PERFORM INITIALIZATION |
(a) Using the Techstream, perform Reset Memory, Deceleration Sensor Zero Point Calibration and CVT Oil Pressure Calibration.
Click here
|
|
8. |
CHECK DTC OUTPUT |
(a) Perform a road test.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Powertrain > Engine and ECT > Trouble Codes
(f) Read the DTCs using the Techstream.
|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
DTC P0842 or P0843 is output |
B |
| A |
|
END |
|
|
9. |
REPLACE ECM |
(a) Replace the ECM.
Click here
| NEXT |
|
|
10. |
CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - ECM) |
(a) Disconnect the C72 oil pressure sensor connector.
(b) Disconnect the C77 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C72-3 (VC) - C77-110 (VCPT) |
Always |
Below 1 Ω |
|
C72-1 (E2) - C77-109 (EPTO) |
Always |
Below 1 Ω |
|
C72-3 (VC) or C77-110 (VCPT) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
C72-1 (E2) or C77-109 (EPTO) - Body ground and other terminals |
Always |
10 kΩ or higher |
(d) Connect the C77 ECM connector.
(e) Connect the C72 oil pressure sensor connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (OIL PRESSURE SENSOR - ECM) |
|
|
11. |
REPLACE ECM |
(a) Replace the ECM.
Click here
| NEXT |
|
|
|