K121 CVT CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM P071512 Input/Turbine Speed Sensor "A" Circuit Short to Battery P071514 Input/Turbine Speed Sensor "A" Circuit Short to Ground or Open P071531 Input/Turbine Speed Sensor "A" No Signal
DESCRIPTION
The ECM uses signals from the transmission revolution sensor (NT) installed to the continuously variable transaxle to control the lock-up engagement pressure.
The transmission revolution sensor (NT) detects the input turbine speed and sends it to the ECM.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|---|
| P071512 | Input/Turbine Speed Sensor "A" Circuit Short to Battery | The transmission revolution sensor (NT) signal is normal but the transmission revolution sensor (NT) output voltage is higher than 1.8 V for 2 seconds or more (1-trip detection logic). | ·
Wire harness or connector ·
Transmission revolution sensor (NT) ·
ECM |
Comes on | Engine | A | SAE Code:
P07C0 |
| P071514 | Input/Turbine Speed Sensor "A" Circuit Short to Ground or Open | The transmission revolution sensor (NT) signal is normal but the transmission revolution sensor (NT) output voltage is less than 0.2 V for 2 seconds or more (1-trip detection logic). | ·
Wire harness or connector ·
Transmission revolution sensor (NT) ·
ECM |
Comes on | Engine | A | SAE Code:
P07BF |
| P071531 | Input/Turbine Speed Sensor "A" No Signal | When transmission revolution sensor (NSS) signal indicates 780 rpm or more and the vehicle speed (SPD) signal indicates 27 km/h (17 mph) or more, the transmission revolution sensor (NT) signal indicates less than 300 rpm for 5 seconds or more (1-trip detection logic). | ·
Wire harness or connector ·
Transmission revolution sensor (NT) ·
ECM |
Comes on | Engine | A | SAE Code:
P0717 |
MONITOR DESCRIPTION
The transmission revolution sensor (NT) is used to detect the input turbine speed. The ECM determines the necessary gear ratio based on a comparison of the transmission revolution sensor (NT) (input turbine speed) and vehicle speed (SPD) signals.
When the vehicle speed is higher than the expected value and the input turbine speed is less than 300 rpm while driving with the shift lever in D, the ECM will determine that the transmission revolution sensor (NT) is malfunctioning, illuminate the MIL and store a DTC.
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.
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]
- 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: P071512, P071514 or P071531.
Check the DTC judgment result.
| GTS Display | Description |
|---|---|
| NORMAL | ·
DTC judgment completed ·
System 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.
·Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.
·Check that no DTCs are stored after performing initialization.
PROCEDURE
According to the display on the GTS, read the Data List.
- Powertrain > Engine > Data List
-
Tester Display Measurement Item Range Normal Condition Diagnostic Note NT Sensor Voltage Transmission revolution sensor (NT) output voltage Min.: 0.000 V
Max.: 4.999 V0.2 to 1.8 V: Engine idling (Vehicle stopped with shift lever in P or N) -
- Powertrain > Engine > Data List
-
Tester Display NT Sensor Voltage - 50003 372 175
- Result:
Result Proceed to The value of NT Sensor Voltage is between 0.2 and 1.8 V A None of the above conditions are met B
A
B
According to the display on the GTS, read the Data List.
- Powertrain > Engine > Data List
-
Tester Display Measurement Item Range Normal Condition Diagnostic Note NT Sensor Speed Input turbine speed (NT) Min.: 0 rpm
Max.: 65535 rpm0 rpm: Vehicle stopped with shift lever in R -
- Powertrain > Engine > Data List
-
Tester Display NT Sensor Speed - 50003 372 929
- Result:
Result Proceed to The value of NT Sensor Speed is 0 rpm A None of the above conditions are met B
A
B
According to the display on the GTS, read the Data List.
- Powertrain > Engine > Data List
-
Tester Display Measurement Item Range Normal Condition Diagnostic Note NT Sensor Speed Input turbine speed (NT) Min.: 0 rpm
Max.: 65535 rpm·Equal to engine speed (NE): Lock-up ON (After warming up engine)
·Nearly equal to engine speed (NE): Lock-up OFF (Engine idling with shift lever in P or N)
-
- Powertrain > Engine > Data List
-
Tester Display NT Sensor Speed - 50003 372 929
- Result:
Result Proceed to Data List values are normal A Data List values are not normal B
A
B
According to the display on the GTS, read the Data List.
- Powertrain > Engine > Data List
-
Tester Display Measurement Item Range Normal Condition Diagnostic Note NT Sensor Speed Input turbine speed (NT) Min.: 0 rpm
Max.: 65535 rpmEqual to NC1 Sensor Speed: Vehicle being driven in gear mode - NC1 Sensor Speed Intermediate shaft (C1 clutch) speed (NC1) Min.: 0 rpm
Max.: 65535 rpmEqual to NT Sensor Speed: Vehicle being driven in gear mode - Shift Mode Shift mode status Gear Mode or Belt Mode - -
- Powertrain > Engine > Data List
-
Tester Display NT Sensor Speed NC1 Sensor Speed Shift Mode - 50003 372 929,540,938
- Result:
Result Proceed to The value of NT Sensor Speed and NC1 Sensor Speed are the same A The value of NT Sensor Speed and NC1 Sensor Speed are different B
A
B
- HINT:
-
for M20C-FKS:
-
for M20D-FKS:
- Result:
Proceed to NEXT
NEXT
for Registration: Click hereDrivetrain>K121 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>REGISTRATION202304,999999,_52,_138176,_0584691,RM1000000029HF6,
for Initialization: Click hereDrivetrain>K121 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>INITIALIZATION202304,202405,_52,_138176,_0584691,RM1000000029HF7,202405,202409,_52,_138176,_0584691,RM100000002JGMX,202409,999999,_52,_138176,_0584691,RM100000002NRHB,
- Result:
Proceed to OK NG
OK
NG
Pre-procedure1
Disconnect the C35 transmission revolution sensor (NT) connector.
Disconnect the C71 ECM connector.
Procedure1
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition C35-2 (NTB) - C71-152 (NTB) Always Below 1 Ω C35-1 (NTO) - C71-153 (NTO) Always Below 1 Ω C35-2 (NTB) or C71-152 (NTB) - Body ground and other terminals Always 10 kΩ or higher C35-1 (NTO) or C71-153 (NTO) - Body ground and other terminals Always 10 kΩ or higher
- Result:
Proceed to OK NG
Post-procedure1
Connect the C71 ECM connector.
Connect the C35 transmission revolution sensor (NT) connector.
OK
NG
- HINT:
-
for M20C-FKS:
-
for M20D-FKS:
- Result:
Proceed to NEXT
NEXT
for Registration: Click hereDrivetrain>K121 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>REGISTRATION202304,999999,_52,_138176,_0584691,RM1000000029HF6,
for Initialization: Click hereDrivetrain>K121 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>INITIALIZATION202304,202405,_52,_138176,_0584691,RM1000000029HF7,202405,202409,_52,_138176,_0584691,RM100000002JGMX,202409,999999,_52,_138176,_0584691,RM100000002NRHB,