- DTC judgment completed
- System normal
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000002B35F |
| Model Year Start: 2023 | Model: Corolla Hatchback | Prod Date Range: [03/2023 - ] |
| Title: K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P274912,P274914,P274931; Intermediate Shaft Speed Sensor "C" Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 - ] | ||
|
DTC |
P274912 |
Intermediate Shaft Speed Sensor "C" Circuit Short to Battery |
|
DTC |
P274914 |
Intermediate Shaft Speed Sensor "C" Circuit Short to Ground or Open |
|
DTC |
P274931 |
Intermediate Shaft Speed Sensor "C" No Signal |
DESCRIPTION
The transmission revolution sensor (NSS) detects the secondary pulley speed and sends it to the ECM.
The ECM determines the current gear ratio from the transmission revolution sensor (NSS) signal.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
DTC Output from |
Priority |
Note |
|---|---|---|---|---|---|---|---|
|
P274912 |
Intermediate Shaft Speed Sensor "C" Circuit Short to Battery |
The transmission revolution sensor (NSS) signal is normal but the transmission revolution sensor (NSS) output voltage is higher than 1.8 V for 4.5 seconds or more (1-trip detection logic). |
|
Comes on |
Engine |
A |
SAE Code: P07CA |
|
P274914 |
Intermediate Shaft Speed Sensor "C" Circuit Short to Ground or Open |
The transmission revolution sensor (NSS) signal is normal but the transmission revolution sensor (NSS) output voltage is less than 0.2 V for 4.5 seconds or more (1-trip detection logic). |
|
Comes on |
Engine |
A |
SAE Code: P07C9 |
|
P274931 |
Intermediate Shaft Speed Sensor "C" No Signal |
When the SPD signal indicates 12 km/h (7 mph) or more and the transmission revolution sensor (NT) signal indicates 780 rpm or more, the transmission revolution sensor (NSS) signal indicates less than 300 rpm for 5 seconds or more (1-trip detection logic). |
|
Comes on |
Engine |
A |
SAE Code: P2751 |
MONITOR DESCRIPTION
The ECM receives signals from the transmission revolution sensor (NSS) installed to the continuously variable transaxle and determines the secondary pulley speed in order to control the gear ratio.
If the ECM detects no signal from the transmission revolution sensor (NSS) even while the vehicle is being driven, it will determine that in the transmission revolution sensor (NSS) is malfunctioning, illuminate the MIL and store a DTC.
MONITOR STRATEGY
|
Related DTCs |
P07C9: Intermediate shaft speed sensor (for Belt Drive) (Transmission revolution sensor (NSS))/Range check (Low voltage) P07CA: Intermediate shaft speed sensor (for Belt Drive) (Transmission revolution sensor (NSS))/Range check (High voltage) P2751: Intermediate shaft speed sensor (for Belt Drive) (Transmission revolution sensor (NSS))/Verify pulse input |
|
Required sensors/Components |
Transmission revolution sensor (NSS) Transmission revolution sensor (NT) Vehicle speed sensor |
|
Frequency of operation |
Continuous |
|
Duration |
P07C9, P07CA: 4.5 sec. P2751: 5 sec. |
|
MIL operation |
Immediate |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
All
|
Battery voltage |
8 V or more |
|
Ignition switch |
ON |
|
Starter |
OFF |
P07C9, P07CA
|
Intermediate shaft speed sensor pulse input fail (P2751) (Pending / MIL) |
Not detected |
P2751
|
Intermediate shaft speed sensor range check fail (P07C9, P07CA) (Pending / MIL) |
Not detected |
|
D range position switch |
ON |
|
R range position switch |
OFF |
|
Park position switch |
OFF |
|
Neutral position switch |
OFF |
|
Engine |
Running |
|
Pressure control solenoid circuit fail (P0962, P0963, P0966, P0967, P2826, P2827, P282F, P2830) (Pending + MIL) |
Not detected |
|
Torque converter clutch pressure control solenoid circuit fail (P2763, P2764) (Pending + MIL) |
Not detected |
|
Shift solenoid circuit fail (P08D2, P08D3, P08DB, P08DC, P099E, P099F) (Pending + MIL) |
Not detected |
|
Vehicle speed |
12 km/h (7.46 mph) or more |
|
Turbine speed sensor revolution |
780 rpm or more |
One of the following conditions is met: Condition (A) or (B)
-
Condition (A)
ECT
20°C (68°F) or more
ECT sensor circuit fail (P0117, P0118)
(Pending + MIL)
Not detected
All of the following conditions are met
2 sec. or more
- Park position switch
OFF
- Neutral position switch
OFF
Condition (B)
One of the following conditions is met
-
- ECT
Less than 20°C (68°F)
- ECT sensor circuit fail (P0117, P0118)
(Pending + MIL)
Detected
All of the following conditions are met
30 sec. or more
- Park position switch
OFF
- Neutral position switch
OFF
TYPICAL MALFUNCTION THRESHOLDS
P07C9
|
Intermediate shaft speed sensor voltage |
Less than 0.2 V |
P07CA
|
Intermediate shaft speed sensor voltage |
More than 1.8 V |
P2751
|
Intermediate shaft speed sensor revolution |
Less than 300 rpm |
COMPONENT OPERATING RANGE
P07C9, P07CA
|
Intermediate shaft speed sensor voltage |
0.2 V or more and 1.8 V or less |
P2751
|
Intermediate shaft speed sensor revolution |
300 rpm or more |
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.
-
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 / Engine / Utility / All Readiness.
- Input the DTC: P274912, P274914 or P274931.
-
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:
-
Strictly observe posted speed limits, traffic laws and road conditions.
- Do not drive the vehicle with the cable of the GTS contacting the pedals, shift lever or steering wheel.
- Driving the vehicle with the cable of the GTS contacting these areas could impede vehicle control, resulting in a serious accident.
-
Do not operate the GTS while driving the vehicle.
- Operating the GTS while driving the vehicle will prevent you from paying sufficient attention to vehicle surroundings, and could result 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 (NSS SENSOR VOLTAGE) |
(a) According to the display on the GTS, read the Data List.
Powertrain > Engine > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
NSS Sensor Voltage |
Transmission revolution sensor (NSS) output voltage |
Min.: 0.000 V Max.: 4.999 V |
0.2 to 1.8 V: Engine idling (Vehicle stopped with shift lever in P or N) |
- |
Powertrain > Engine > Data List
|
Tester Display |
|---|
|
NSS Sensor Voltage |
|
Result |
Proceed to |
|---|---|
|
The value of NSS Sensor Voltage is between 0.2 and 1.8 V |
A |
|
None of the above conditions are met |
B |
| B |
|
|
|
2. |
READ VALUE USING GTS (NSS SENSOR SPEED) |
(a) According to the display on the GTS, read the Data List.
Powertrain > Engine > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
NSS Sensor Speed |
Secondary pulley speed (NSS) |
Min.: 0 rpm Max.: 65535 rpm |
0 rpm: Vehicle stopped and shift lever in D |
- |
Powertrain > Engine > Data List
|
Tester Display |
|---|
|
NSS Sensor Speed |
|
Result |
Proceed to |
|---|---|
|
The value of NSS Sensor Speed is 0 rpm |
A |
|
None of the above conditions are met |
B |
| B |
|
|
|
3. |
READ VALUE USING GTS (NSS SENSOR SPEED) |
(a) According to the display on the GTS, read the Data List.
Powertrain > Engine > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
NSS Sensor Speed |
Secondary pulley speed (NSS) |
Min.: 0 rpm Max.: 65535 rpm |
Equal to NC1 Sensor Speed / 1.481 / 2.28: Vehicle being driven in belt mode and synchronizer is engaged |
- |
|
NC1 Sensor Speed |
Intermediate shaft (C1 clutch) speed (NC1) |
Min.: 0 rpm Max.: 65535 rpm |
|
- |
|
Status of Synchronize |
Synchronizer status |
OFF or ON |
|
- |
|
Shift Mode |
Shift mode status |
Gear Mode or Belt Mode |
- |
- |
Powertrain > Engine > Data List
|
Tester Display |
|---|
|
NSS Sensor Speed |
|
NC1 Sensor Speed |
|
Status of Synchronize |
|
Shift Mode |
|
Result |
Proceed to |
|---|---|
|
Data List values are normal |
A |
|
Data List values are not normal |
B |
| B |
|
|
|
4. |
REPLACE ECM |
HINT:
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
5. |
INSPECT TRANSMISSION REVOLUTION SENSOR (NSS) |
Click here
| NG |
|
|
|
6. |
CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR (NSS) - ECM) |
Pre-procedure1
(a) Disconnect the C70 transmission revolution sensor (NSS) 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 |
|---|---|---|
|
C70-1 (NSSO) - C160-101 (NSSO) |
Always |
Below 1 Ω |
|
C70-2 (NSSB) - C160-100 (NSSB) |
Always |
Below 1 Ω |
|
C70-1 (NSSO) or C160-101 (NSSO) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
C70-2 (NSSB) or C160-100 (NSSB) - Body ground and other terminals |
Always |
10 kΩ or higher |
Post-procedure1
(d) Connect the C160 ECM connector.
(e) Connect the C70 transmission revolution sensor (NSS) connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION REVOLUTION SENSOR (NSS) - ECM) |
|
|
7. |
REPLACE ECM |
HINT:
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
|