RM36D0EC _52 Drivetrain _138176 K121 CVT _0584691 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM C

K121 CVT  CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM  P071011  Transmission Fluid Temperature Sensor "A" Circuit Short To Ground  


DESCRIPTION

The CVT fluid temperature sensor converts the CVT fluid temperature into a resistance value for use by the ECM.

The sensor resistance changes with the CVT fluid temperature. As the temperature rises, the sensor resistance decreases. The ECM applies voltage to the temperature sensor through ECM terminal THO1 and calculates the fluid temperature based on the voltage signal.

HINT:

The CVT fluid temperature is likely to increase under conditions such as towing, climbing hills and in traffic.


DTC No. Detection Item DTC Detection Condition Trouble Area MIL DTC Output from Priority Note
P071011 Transmission Fluid Temperature Sensor "A" Circuit Short To Ground When the battery voltage is 8 V or more and the ignition switch is ON, the CVT fluid temperature sensor voltage is less than 0.142 V for 0.5 seconds (1-trip detection logic).
·

Wire harness or connector

·

Transmission wire (CVT fluid temperature sensor)

·

ECM


Comes on Engine A SAE Code:
P0712

MONITOR DESCRIPTION

The CVT fluid temperature sensor converts the CVT fluid temperature to an electrical resistance value. Based on the resistance, the ECM determines the CVT fluid temperature and can detect a short to ground in the CVT fluid temperature circuit. If the resistance value of the CVT fluid temperature is less than 79 Ω*, the ECM interprets this as a malfunction of the CVT fluid temperature sensor or wiring, illuminates the MIL and stores a DTC.

*: 150°C (302°F) or more is indicated regardless of the actual CVT fluid temperature.

HINT:

The CVT fluid temperature can be checked in the Data List.


CONFIRMATION DRIVING PATTERN

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 hereDrivetrain>K121 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>DTC CHECK / CLEAR



1.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

2.

Turn the ignition switch off and wait for 2 minutes or more.

3.

Wait for 3 seconds or more with the ignition switch ON. [*1]

HINT:

[*1]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.


4.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

5.

Input the DTC: P071011.

6.

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

C318996E80
1.49,1.74 3.458,1.927 1.969,0.188 10 false CVT Fluid Temperature Sensor 1.594,2.729 3.427,2.927 1.833,0.198 10 false Transmission Wire 0.771,3.156 3.563,3.354 2.792,0.198 10 false Continuously Variable Transaxle Assembly 6.063,3.323 6.979,3.667 0.917,0.344 10 false ECM 3.531,1.125 3.99,1.323 0.458,0.198 10 false OT+ 3.552,2.104 4.01,2.302 0.458,0.198 10 false OT- 3.917,2.104 4.375,2.302 0.458,0.198 10 false 12 3.917,1.135 4.375,1.333 0.458,0.198 10 false 11 5.26,1.125 5.719,1.323 0.458,0.198 10 false 126 5.594,1.125 6.052,1.323 0.458,0.198 10 false THO1 5.604,2.104 6.063,2.302 0.458,0.198 10 false ETHO 5.26,2.104 5.719,2.302 0.458,0.198 10 false 125 6.281,0.979 6.74,1.177 0.458,0.198 10 false 5 V 1.594,2.573 2.031,2.781 0.438,0.208 10 false C34 6.052,3.156 6.625,3.427 0.573,0.271 10 false C71

PROCEDURE

1.READ VALUE USING GTS (A/T OIL TEMPERATURE NO.1)

Pre-procedure1

a.

Warm up the engine.


Procedure1

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
A/T Oil Temperature No.1 CVT fluid temperature sensor value Min.: -40°C (-40°F)
Max.: 150°C (302°F)
or Invalid Value
·

Approximately 100°C (212°F): After stall speed test

·

Equal to ambient temperature: After cold soak


If the value is -40°C (-40°F) or 150°C (302°F) or more, the CVT fluid temperature sensor circuit is open or shorted.
Powertrain > Engine > Data List
Tester Display
A/T Oil Temperature No.1
50003 372 180
Result:
Result Proceed to
Data List value is normal A
Data List value is not normal B



Post-procedure1

c.

None



A

2.REPLACE ECM

B

3.INSPECT TRANSMISSION WIRE (CVT FLUID TEMPERATURE SENSOR)
3.INSPECT TRANSMISSION WIRE (CVT FLUID TEMPERATURE SENSOR)

Pre-procedure1

a.

Disconnect the C34 transmission wire connector.


Procedure1

b.
C397724C02
2.083,1.552 0.979,1.333 true 2.25,1.563 2.865,1.344 true 0.083,0.083 0.396,0.24 0.313,0.156 10 false *a 2.917,1.26 3.302,1.458 0.385,0.198 10 false OT+ 0.688,1.24 1.302,1.438 0.615,0.198 10 false OT-
*a Component without harness connected
(Transmission Wire)


Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
11 (OT+) - 12 (OT-) Always 0.079 to 156 kΩ
11 (OT+) - Body ground and other terminals Always 10 kΩ or higher
12 (OT-) - Body ground and other terminals Always 10 kΩ or higher


HINT:

If the resistance is out of the specified range at any of the CVT fluid temperatures shown in the table below, the driveability of the vehicle may decrease.

CVT Fluid Temperature Specified Condition
10°C (50°F) 5.6 to 7.3 kΩ
25°C (77°F) 3.5 kΩ
110°C (230°F) 0.22 to 0.27 kΩ


Result:
Proceed to
OK
NG



Post-procedure1

c.

Connect the C34 transmission wire connector.



OK

4.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

NG

REPLACE TRANSMISSION WIRE

Click hereDrivetrain>K121 (CVT)>TRANSMISSION WIRE>REMOVAL


4.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

Pre-procedure1

a.

Disconnect the C71 ECM connector.


Procedure1

b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
C71-126 (THO1) - C71-125 (ETHO) Always 0.079 to 156 kΩ
C71-126 (THO1) - Body ground and other terminals Always 10 kΩ or higher
C71-125 (ETHO) - Body ground and other terminals Always 10 kΩ or higher


Result:
Proceed to
OK
NG



Post-procedure1

c.

Connect the C71 ECM connector.



OK

5.REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM)