- DTC judgment completed
- System normal
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000002B36C |
| Model Year Start: 2023 | Model: Corolla Hatchback | Prod Date Range: [03/2023 - ] |
| Title: K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P076A7F,P08D57F; Shift Solenoid "H" Control Actuator Stuck Off; 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 - ] | ||
|
DTC |
P076A7F |
Shift Solenoid "H" Control Actuator Stuck Off |
|
DTC |
P08D57F |
Shift Solenoid "K" Control Actuator Stuck Off |
DESCRIPTION
By controlling the current, the ECM controls the shift solenoid valve SC1 and switches between forward driving control fluid pressure, and rearward driving control fluid pressure.
By controlling the current, the ECM controls the shift solenoid valve SC3 and switches the shift solenoid valve SLU between the role of controlling the lock-up clutch pressure and controlling the B1 brake pressure.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
DTC Output from |
Priority |
Note |
|---|---|---|---|---|---|---|---|
|
P076A7F |
Shift Solenoid "H" Control Actuator Stuck Off |
When the ECM commands the B1 brake to be engaged, the difference between the signals from the transmission revolution sensor (NT) and (NC1) is more than 300 rpm for 2 seconds or more (2-trip detection logic). |
|
Comes on |
Engine |
B |
SAE Code: P076B |
|
P08D57F |
Shift Solenoid "K" Control Actuator Stuck Off |
When the ECM commands the B1 brake to be engaged, the difference between the signals from the transmission revolution sensor (NT) and (NC1) is more than 300 rpm for 2 seconds or more (2-trip detection logic). |
|
Comes on |
Engine |
B |
SAE Code: P08D6 |
MONITOR DESCRIPTION
When the ECM requests the R range, the solenoid valves SC1 and SC3 turn ON and the solenoid valve SLU controls the B1 brake.
When the ECM requests the R range, if the difference between the transmission revolution sensor (NT) and (NC1) signals is more than 300 rpm, it determines that the shift solenoid valve SC1 or SC3 is malfunctioning, illuminates the MIL and stores this DTC.
MONITOR STRATEGY
|
Related DTCs |
P076B: Shift solenoid "H" (Shift solenoid valve SC1)/Functional check P08D6: Shift solenoid "K" (Shift solenoid valve SC3)/Functional check |
|
Required sensors/Components |
Crankshaft position sensor Transmission revolution sensor (NT) Transmission revolution sensor (NC1) Transmission revolution sensor (NSS) Gear shift position sensor CVT fluid temperature sensor Engine coolant temperature sensor Oil pressure sensor Shift solenoid valve SL1 Shift solenoid valve SL2 Shift solenoid valve SLP Shift solenoid valve SLS Shift solenoid valve SLU Shift solenoid valve SC1 Shift solenoid valve SC2 Shift solenoid valve SC3 |
|
Frequency of operation |
Continuous |
|
Duration |
2 sec. |
|
MIL operation |
2 driving cycles |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
All
|
ETC system (Electronic throttle control system) |
Not system down (MIL illuminated by following codes: P0121, P0122, P0123, P0222, P0223, P0604, P0606, P0607, P060D, P060E, P0657, P0658, P1607, P16B0, P2102, P2103, P2111, P2112, P2119, P2135) |
|
KCS sensor circuit (Knock sensor) |
Not circuit malfunction (MIL illuminated by following codes: P0327, P0328) |
|
ECT sensor circuit (Engine coolant temperature sensor) |
Not circuit malfunction (MIL illuminated by following codes: P0117, P0118) |
|
IAT sensor circuit (Intake air temperature sensor) |
Not circuit malfunction (MIL illuminated by following codes: P0112, P0113) |
|
Crankshaft position sensor "A" circuit (Crankshaft position sensor) |
Not circuit malfunction (MIL illuminated by following codes: P0335, P0337, P0338) |
|
Transmission fluid pressure sensor "A" circuit (Oil pressure sensor) |
Not circuit malfunction (MIL illuminated by following codes: P0842, P0843) |
|
Low voltage flag |
OFF |
|
Pressure control solenoid "J" circuit (Shift solenoid valve SLP) |
Not circuit malfunction (MIL illuminated by following codes: P2826, P2827) |
|
Pressure control solenoid "K" circuit (Shift solenoid valve SLS) |
Not circuit malfunction (MIL illuminated by following codes: P282F, P2830) |
|
Torque converter clutch pressure control solenoid circuit (Shift solenoid valve SLU) |
Not circuit malfunction (MIL illuminated by following codes: P2763, P2764) |
|
Pressure control solenoid "A" circuit (Shift solenoid valve SL1) |
Not circuit malfunction (MIL illuminated by following codes: P0962, P0963) |
|
Pressure control solenoid "B" circuit (Shift solenoid valve SL2) |
Not circuit malfunction (MIL illuminated by following codes: P0966, P0967) |
|
Transmission fluid temperature sensor "A" circuit (CVT fluid temperature sensor) |
Not circuit malfunction (MIL illuminated by following codes: P0712, P0713) |
|
Turbine speed sensor "A" circuit (Transmission revolution sensor (NT)) |
Not circuit malfunction (MIL illuminated by following codes: P0717, P07BF, P07C0) |
|
Intermediate shaft speed sensor "C" circuit (Transmission revolution sensor (NSS)) |
Not circuit malfunction (MIL illuminated by following codes: P07C9, P07CA, P2751) |
|
Gear shift position circuit |
Not circuit malfunction (MIL illuminated by following codes: P0916, P0917) |
|
Output speed sensor circuit (Transmission revolution sensor (NOUT)) |
Not circuit malfunction (MIL illuminated by following codes: P0722, P077C, P077D) |
|
Intermediate shaft speed sensor "B" circuit (Transmission revolution sensor (NC1)) |
Not circuit malfunction (MIL illuminated by following codes: P07C7, P07C8, P2747) |
|
Shift solenoid "H" circuit (Shift solenoid valve SC1) |
Not circuit malfunction (MIL illuminated by following codes: P099E, P099F) |
|
Shift solenoid "J" circuit (Shift solenoid valve SC2) |
Not circuit malfunction (MIL illuminated by following codes: P08D2, P08D3) |
|
Shift solenoid "K" circuit (Shift solenoid valve SC3) |
Not circuit malfunction (MIL illuminated by following codes: P08DB, P08DC) |
|
Engine |
Starting |
|
Engine speed |
500 rpm or more |
|
Synchronizer |
Engaged |
|
Turbine speed |
More than 0 rpm |
|
Any of the following conditions are met: (a) or (b) |
- |
|
(a) Reverse mode clutch speed |
More than 0 rpm |
|
(b) All of the following conditions are met |
- |
|
- Reverse mode clutch speed |
0 rpm |
|
- Output speed |
0 rpm |
P076B
|
Pressure control solenoid "J" circuit (Shift solenoid valve SLP) |
Not circuit malfunction (MIL illuminated by following codes: P2826, P2827) |
TYPICAL MALFUNCTION THRESHOLDS
|
ECM indicate reverse mode clutch |
Engagement |
|
Turbine speed - Reverse mode clutch speed |
More than 300 rpm |
CONFIRMATION DRIVING PATTERN
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
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.
-
Wait with the shift lever in R for 4 seconds or more. [*1]
Click here
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: P076A7F or P08D57F.
-
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.
CAUTION / NOTICE / HINT
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
HINT:
If any DTCs other than P076A7F or P08D57F are output, perform troubleshooting for those DTCs first.
PROCEDURE
|
1. |
CHECK DTC OUTPUT |
(a) Read the DTCs using the GTS.
Powertrain > Engine > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
Only P076A7F or P08D57F is output |
A |
|
P076A7F or P08D57F and other DTCs are output |
B |
| B |
|
GO TO DTC CHART |
|
|
2. |
INSPECT TRANSMISSION VALVE BODY ASSEMBLY (SHIFT SOLENOID VALVE SC1 and SC3) |
Pre-procedure1
(a) Disconnect the transmission wire connector from the shift solenoid valves SC1 and SC3.
HINT:
Click here
Procedure1
(b) Connect a positive (+) lead from the battery to the terminal of the shift solenoid valve SC1 connector and a negative (-) lead to the shift solenoid valve SC1 body. Check that the valve moves and makes an operating sound.
OK:
Valve moves and makes an operating sound.
|
*1 |
Transmission Valve Body Assembly |
*2 |
Shift Solenoid Valve SC1 |
|
*3 |
Shift Solenoid Valve SC3 |
- |
- |
|
*a |
Component without harness connected (Shift Solenoid Valve SC1 and SC3) |
- |
- |
(c) Connect a positive (+) lead from the battery to the terminal of the shift solenoid valve SC3 connector and a negative (-) lead to the shift solenoid valve SC3 body. Check that the valve moves and makes an operating sound.
OK:
Valve moves and makes an operating sound.
Post-procedure1
(d) None
| NG |
|
|
|
3. |
REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY |
HINT:
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
4. |
REPLACE TRANSMISSION VALVE BODY ASSEMBLY |
HINT:
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
|