- DTC judgment completed
- System normal
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000002B35J |
| Model Year Start: 2023 | Model: Corolla Hatchback | Prod Date Range: [03/2023 - ] |
| Title: K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P275600,P27567E; Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance/Stuck Off; 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 - ] | ||
|
DTC |
P275600 |
Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance/Stuck Off |
|
DTC |
P27567E |
Torque Converter Clutch Pressure Control Solenoid Control Actuator Stuck On |
DESCRIPTION
Using the current from the ECM, the shift solenoid valve SLU controls the B1 brake when the shift lever is in R, and controls the lock-up clutch pressure and performs lock-up and flex lock-up control when the shift lever is in D, M*1 or B*2.
The ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM memory to detect mechanical malfunctions of the shift solenoid valve SLU, transmission valve body assembly and torque converter assembly.
*1: w/ Sequential Shift
*2: w/o Sequential Shift
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
DTC Output from |
Priority |
Note |
|---|---|---|---|---|---|---|---|
|
P275600 |
Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance/Stuck Off |
When the ECM commands lock-up ON, the difference between the engine speed (NE) and transmission revolution sensor (NT) signal is 250 rpm or more for 2 seconds or more (2-trip detection logic). |
|
Comes on |
Engine |
B |
SAE Code: P2757 |
|
P27567E |
Torque Converter Clutch Pressure Control Solenoid Control Actuator Stuck On |
When the ECM commands lock-up OFF, the difference between the engine speed (NE) and transmission revolution sensor (NT) signal is less than 25 rpm for 1 second or more (1-trip detection logic). |
|
Comes on |
Engine |
B |
SAE Code: P2757 |
MONITOR DESCRIPTION
When performing lock-up control (ON/OFF) of the torque converter assembly, the ECM compares the transmission revolution sensor (NT) signal and engine speed (NE) signal to detect mechanical malfunctions in the shift solenoid valves SLU.
If the torque converter does not lock-up while a lock-up ON command is being sent, the ECM detects it as a mechanical malfunction of the shift solenoid valve SLU.
If the difference between the engine speed (NE) signal and transmission revolution sensor (NT) signal is outside of the threshold, the ECM detects the malfunction, illuminates the MIL and stores a DTC.
MONITOR STRATEGY
|
Related DTCs |
P2757: Torque converter clutch pressure control solenoid (Shift solenoid valve SLU)/Functional check |
|
Required sensors/Components |
Crankshaft position sensor Transmission revolution sensor (NT) 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 |
|
Frequency of operation |
Continuous |
|
Duration |
OFF malfunction (A): 2 sec. OFF malfunction (B): 2 sec. ON malfunction: 1 sec. |
|
MIL operation |
OFF malfunction (A) and (B): 2 driving cycles ON malfunction: 1 driving cycle |
|
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) |
|
Low voltage flag |
OFF |
|
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) |
|
Ignition switch |
ON |
OFF malfunction (A)
|
Any of the following conditions are met: (a) or (b) |
- |
|
(a) Gear mode clutch |
Engaged |
|
(b) Belt mode clutch |
Engaged |
|
Engine speed |
1000 rpm or more |
|
Shift solenoid valve SLP |
Operating shift control by ECM command |
OFF malfunction (B)
|
Engine speed |
550 rpm or more |
|
Transmission fluid temperature |
-10°C (14°F) or more |
|
Time after following condition is met |
0.5 sec. or more |
|
- Variation of the accelerator pedal angle (within 32.768 msec.) |
Less than 0.5% |
|
Shift solenoid valve SLS |
Operating clamping pressure control by ECM command |
|
ECT |
60°C (140°F) or more |
|
Spark advance from MAX. retard timing by KCS control |
0 °CA or more |
|
Gear and belt mode clutch |
Either engagement or disengagement |
ON malfunction
|
Any of the following conditions are met: (a) or (b) |
- |
|
(a) Gear mode clutch |
Engaged |
|
(b) Belt mode clutch |
Engaged |
|
Calculated input torque at Turbine speed 2000 rpm (Conditions vary with turbine speed) |
74 N*m (755 kgf*cm, 55 ft.*lbf) or more |
|
Engine speed |
500 rpm or more |
|
Accelerator pedal release flag |
OFF |
|
Shift solenoid valve SLP |
Operating shift control by ECM command |
TYPICAL MALFUNCTION THRESHOLDS
OFF malfunction
-
Both of the following conditions are met: OFF malfunction (A) and (B)
OFF malfunction (A)
Engine speed - Turbine speed
250 rpm or more
ECM indicate lock-up clutch
Engagement
OFF malfunction (B) (after OFF malfunction (A) is met)
Target clamping pressure
1.4 MPa (14.3 kgf/cm2, 203 psi) or more
Actual clamping pressure - Target clamping pressure
Less than 0.5 MPa (5.1 kgf/cm2, 73 psi)
-
ON malfunction
Engine speed - Turbine speed
Less than 25 rpm
ECM indicate lock-up clutch
Release
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.
-
Drive the vehicle and confirm the lock-up on and off conditions according to Road Test. [*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.
- Stop the vehicle.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P275600 or P27567E.
-
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 P275600 or P27567E are output, perform troubleshooting for those DTCs first.
PROCEDURE
|
1. |
CHECK DTC OUTPUT (IN ADDITION TO DTC P275600 AND P27567E) |
(a) Read the DTCs using the GTS.
Powertrain > Engine > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
Only P275600 and P27567E are output |
A |
|
P275600 or P27567E and other DTCs are output |
B |
| B |
|
GO TO DTC CHART |
|
|
2. |
INSPECT TRANSMISSION VALVE BODY ASSEMBLY (SHIFT SOLENOID VALVE SLU) |
Click here
| NG |
|
|
|
3. |
REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY |
HINT:
Click here
|
|
4. |
REPLACE TORQUE CONVERTER ASSEMBLY |
HINT:
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
5. |
REPLACE TRANSMISSION VALVE BODY ASSEMBLY |
HINT:
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
|