DTC    P0712    Transmission Fluid Temperature Sensor "A" Circuit Low Input

DTC    P0713    Transmission Fluid Temperature Sensor "A" Circuit High Input

for Preparation Click here


DESCRIPTION

G031389E20
The CVT fluid temperature sensor converts the fluid temperature into a resistance value which is input into the ECM.
The sensor resistance changes with the transmission fluid temperature. As the temperature rises, the sensor resistance decreases. The ECM applies a voltage to the temperature sensor through ECM terminal THO1, and the ECM 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 heavy traffic.


DTC No.
DTC Detection Condition
  1. Diagnosis Condition
  2. Malfunction Status
  3. Malfunction Time
  4. Other
Trouble Area
P0712
  1. -
  2. Short in CVT fluid temperature sensor circuit
  3. 0.5 seconds
  4. 1-trip detection logic
  1. Short in CVT fluid temperature sensor circuit
  2. Continuously variable transaxle assembly
    (Transmission fluid temperature sensor)
  3. ECM
P0713
  1. 15 minutes or more after starting engine
  2. Open in CVT fluid temperature sensor circuit
  3. 0.5 seconds
  4. 1-trip detection logic
  1. Open in CVT fluid temperature sensor circuit
  2. Continuously variable transaxle assembly
    (Transmission fluid temperature sensor)
  3. ECM

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 detects opens or shorts in the CVT fluid temperature circuit. If the resistance value of the CVT fluid temperature is less than 79 Ω*1 or more than 156 kΩ*2, the ECM interprets this as a fault in the CVT fluid sensor or wiring. The ECM turns on the MIL and stores the DTC.
*1: 150°C (302°F) or more is indicated regardless of the actual CVT fluid temperature.
*2: -40°C (-40°F) is indicated regardless of the actual CVT fluid temperature.

HINT:
The CVT fluid temperature can be checked on the intelligent tester display.


WIRING DIAGRAM


C161969E10


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (A/T OIL TEMPERATURE 1)

  1. Warm up the engine.

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List.

  1. In accordance with the display on the tester, read the Data List.

    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    A/T Oil Temperature 1
    		CVT fluid Temperature Sensor Value/
    min.: -40°C (-40°F)
    max.: 215°C (419°F)
    1. After Stall Test; Approximately 80°C (176°F)
    2. Equal to ambient temperature when cold soak
    		If value is -40°C (-40°F) or 150°C (302°F) or more, CVT fluid temperature sensor circuit is open or short.
    Result 
    Result
    		Proceed to
    Data display is not within Normal Condition range
    		A
    Data display is within Normal Condition range
    		B



B
Go to step 4
A


2.INSPECT CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY (CVT FLUID TEMPERATURE SENSOR)


    C193934E01

  1. Disconnect the transmission wire connector from the transaxle.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (THO) - 6 (E2)
    		Always
    		79 Ω to 156 kΩ
    1 (THO) - Body ground
    		Always
    		10 kΩ or higher
    6 (E2) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Component without harness connected:
    (Continuously Variable Transaxle Assembly
    (Transmission Wire))

    HINT:
    If the resistance is outside the specified range at either of the CVT fluid temperatures shown in the table below, the driveability of the vehicle may be affected.
    CVT fluid Temperature
    		Specified Condition
    10°C (50°F)
    		5 to 8 kΩ
    25°C (77°F)
    		2.5 to 4.5 kΩ
    110°C (230°F)
    		0.22 to 0.28 kΩ



NG
Go to step 6
OK


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


    C193935E01

  1. Disconnect the ECM connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    B14-1 (THO) - B8-70 (THO1)
    		Always
    		Below 1 Ω
    B14-6 (E2) - B8-71 (ETHO)
    		Always
    		Below 1 Ω
    B8-70 (THO1) - Body ground
    		Always
    		10 kΩ or higher
    B8-71 (ETHO) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector:
    (to Continuously Variable Transaxle Assembly
    (Transmission Wire))
    *2
    		Front view of wire harness connector:
    (to ECM)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.REPLACE ECM

  1. Replace the ECM (Click here).


NEXT


5.PERFORM INITIALIZATION

NOTICE:
  1. Performing reset memory/initialization will clear the learned values of both the yaw rate and acceleration sensor (deceleration sensor 0 point calibration) and the CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate and acceleration sensor 0 point calibration, and CVT oil pressure calibration when replacing any of the parts shown in the following table:
    Replaced Part
    1. Continuously variable transaxle assembly
    2. ECM
    3. Oil pressure sensor
    4. Yaw rate and acceleration sensor
  2. After reset memory, always perform yaw rate and acceleration sensor (deceleration sensor 0 point) calibration first, and then the CVT oil pressure calibration.
  3. Always perform the 0 point calibration with the vehicle on level ground.
  4. Do not shake or vibrate the vehicle during the 0 point calibration.

  1. Using the intelligent tester, perform the reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration (Click here).

  1. Check for DTCs again (Click here).


NEXT

END 

6.REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

  1. Replace the continuously variable transaxle assembly (Click here).


NEXT


7.PERFORM INITIALIZATION

NOTICE:
  1. Performing reset memory/initialization will clear the learned values of both the yaw rate and acceleration sensor (deceleration sensor 0 point calibration) and the CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate and acceleration sensor 0 point calibration, and CVT oil pressure calibration when replacing any of the parts shown in the following table:
    Replaced Part
    1. Continuously variable transaxle assembly
    2. ECM
    3. Oil pressure sensor
    4. Yaw rate and acceleration sensor
  2. After reset memory, always perform yaw rate and acceleration sensor (deceleration sensor 0 point) calibration first, and then the CVT oil pressure calibration.
  3. Always perform the 0 point calibration with the vehicle on level ground.
  4. Do not shake or vibrate the vehicle during the 0 point calibration.

  1. Using the intelligent tester, perform the reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration (Click here).

  1. Check for DTCs again (Click here).


NEXT

END