- DTC judgment completed
- System normal
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001D0XJ |
| Model Year Start: 2019 | Model: Corolla Hatchback | Prod Date Range: [06/2018 - ] |
| Title: K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P077512; Pressure Control Solenoid "B" Circuit Short to Battery; 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 - ] | ||
|
DTC |
P077512 |
Pressure Control Solenoid "B" Circuit Short to Battery |
DESCRIPTION
Using the current from the TCM, the shift solenoid valve SL2 controls the C2 clutch pressure in accordance with the requested shift mode.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
Note |
|---|---|---|---|---|---|---|
|
P077512 |
Pressure Control Solenoid "B" Circuit Short to Battery |
A short to +B is detected in the shift solenoid valve SL2 circuit for 1 second or more (1-trip detection logic). |
|
Comes on |
DTC stored |
SAE Code: P0967 |
MONITOR DESCRIPTION
This DTC indicates a short to +B in the shift solenoid valve SL2 circuit. If there is a short to +B in the shift solenoid valve SL2 circuit, the TCM detects the malfunction, illuminates the MIL and stores this DTC.
MONITOR STRATEGY
|
Related DTCs |
P0967: Pressure control solenoid "B" (Shift solenoid valve SL2)/Range check (High current) |
|
Required sensors/Components |
Shift solenoid valve SL2 |
|
Frequency of operation |
Continuous |
|
Duration |
1 sec. |
|
MIL operation |
Immediate |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
All
|
The monitor will run whenever the following DTCs are not stored |
None |
|
Solenoid current cut status |
Not cut |
|
Engine switch |
On (IG) |
|
Starter |
OFF |
Condition (A)
|
Battery voltage |
8 V or more and 11.499 V or less |
|
Target current (0.1 sec. or more) |
0.9 A or less |
Condition (B)
|
Battery voltage |
11.5 V or more and 16 V or less |
|
Target current (0 sec. or more) |
1 A or less |
TYPICAL MALFUNCTION THRESHOLDS
Any of the following conditions are met: Condition (A) or (B)
Condition (A)
|
Battery voltage |
8 V or more and 11.499 V or less |
|
Solenoid current |
More than 1.145 A |
Condition (B)
|
Battery voltage |
11.5 V or more and 16 V or less |
|
Solenoid current |
More than 1.22 A |
COMPONENT OPERATING RANGE
Both of the following conditions are met: Condition (A) and (B)
Condition (A)
|
Battery voltage |
8 V or more and 11.499 V or less |
|
Solenoid current |
1.145 A or less |
Condition (B)
|
Battery voltage |
11.5 V or more and 16 V or less |
|
Solenoid current |
1.22 A or less |
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
![2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the engine switch off and wait for 2 minutes or more.
- Turn the engine switch on (IG) and turn the Techstream on.
- Start the engine.
-
Perform the D Position Shift Test inspection in 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 / Transmission / Utility / All Readiness.
- Input the DTC: P077512.
-
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
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. |
INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2) |
|
(a) Disconnect the C61 transmission wire connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 (SL2+) - Other terminals |
Always |
10 kΩ or higher |
|
8 (SL2-) - Other terminals |
Always |
10 kΩ or higher |
(c) Connect the C61 transmission wire connector.
| NG |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM) |
(a) Disconnect the C80 TCM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C80-19 (SL2+) - Other terminals |
Always |
10 kΩ or higher |
|
C80-20 (SL2-) - Other terminals |
Always |
10 kΩ or higher |
(c) Connect the C80 TCM connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - TCM) |
|
|
3. |
REPLACE TCM |
(a) Replace the TCM.
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
4. |
INSPECT TRANSMISSION WIRE |
(a) Disconnect the C61 transmission wire connector.
|
*1 |
Transmission Valve Body Assembly |
*2 |
Shift Solenoid Valve SL2 |
|
*3 |
Transmission Wire |
- |
- |
|
*a |
Shift Solenoid Valve Side |
*b |
Wire Harness Connector Side |
(b) Disconnect the transmission wire connector from the shift solenoid valve SL2.
Click here
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 (shift solenoid valve side) or 3 (SL2+) (wire harness connector side) - All other terminals |
Always |
10 kΩ or higher |
|
2 (shift solenoid valve side) or 8 (SL2-) (wire harness connector side) - All other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPLACE TRANSMISSION WIRE
|
|
|
5. |
REPLACE TRANSMISSION VALVE BODY ASSEMBLY |
(a) Replace the transmission valve body assembly.
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
|