Toyota CH-R Service Manual: Transmission Fluid Temperature Sensor "A" Circuit Low Input (P0712,P0713)

Toyota CH-R Service Manual / K114 Cvt / Continuously Variable Transaxle System / Transmission Fluid Temperature Sensor "A" Circuit Low Input (P0712,P0713)

DESCRIPTION

The CVT fluid temperature sensor converts the fluid temperature into a resistance value which is detected 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

Memory

P0712

Transmission Fluid Temperature Sensor "A" Circuit Low Input

There is a short in the CVT fluid temperature sensor circuit for 0.5 seconds (1 trip detection logic).

  • Wire harness or connector
  • Continuously variable transaxle assembly (CVT fluid temperature sensor)
  • ECM

Comes on

DTC stored

P0713

Transmission Fluid Temperature Sensor "A" Circuit High Input

Either one of the following conditions is met (1 trip detection logic):

  • When 10 seconds or more have elapsed after engine start (engine coolant and intake air temperatures at engine start were higher than -29.375°C (-20.875°F), there is an open in the CVT fluid temperature sensor circuit for more than 0.5 seconds.
  • When 15 minutes or more have elapsed after engine start (engine coolant and intake air temperatures were lower than -29.375°C (-20.875°F) at engine start, there is an open in the CVT fluid temperature sensor circuit for 0.5 seconds.
  • Wire harness or connector
  • Continuously variable transaxle assembly (CVT fluid temperature sensor)
  • ECM

Comes on

DTC stored

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 an open or short circuit in the CVT fluid temperature circuit. If the resistance value of the CVT fluid temperature is below 79 Ω*1 or higher than 156 kΩ*2, the ECM interprets this as a fault in the CVT fluid sensor or wiring. The ECM illuminates the MIL and stores a DTC.

*1: 150°C (302°F) or higher 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 Techstream display.

MONITOR STRATEGY

Related DTCs

P0712: CVT fluid temperature sensor / Range check (Low voltage)

P0713: CVT fluid temperature sensor / Range check (High voltage)

Required sensors/Components

Continuously variable transaxle assembly

(CVT fluid temperature sensor)

Frequency of operation

Continuous

Duration Conditions

0.5 seconds

MIL operation

Immediately

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

Battery voltage

8 V or more

Time after Battery voltage 8 V or more

0.5 seconds or more

Write Inhibit

permit

Time after Write status forbiddance to permit

0.5 seconds or more

Ignition switch

ON

Time after Ignition switch OFF to ON

0.5 seconds or more

Starter

OFF

Time after Starter ON to OFF

0.5 seconds or more

P0712:

The monitor will run whenever the following DTCs are not present.

None

P0713 Condition (A):

Engine coolant temperature (ECT) or intake air temperature (IAT) at engine start.

-29.375°C (-20.875°F) or less

Time after engine start

10 minutes

ECT (Engine coolant temperature) Sensor circuit fail (Pending + MIL) (P0115, P0117, P0118)

Not detected

IAT (Intake air temperature) Sensor circuit fail (Pending + MIL) (P00AC, P00AD, P0110, P0112, P0113)

Not detected

P0713 Condition (B):

Engine coolant temperature (ECT) or intake air temperature (IAT) at engine start.

More than -29.375°C (-20.875°F)

Time after engine start

10 seconds

ECT (Engine coolant temperature) Sensor circuit fail (Pending + MIL) (P0115, P0117, P0118)

Not detected

IAT (Intake air temperature) Sensor circuit fail (Pending + MIL) (P00AC, P00AD, P0110, P0112, P0113)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0712:

CVT fluid temperature sensor voltage

CVT fluid temperature sensor output temperature)

Less than 0.14 V

(Higher than 164°C (327.2°F))

P0713:

CVT fluid temperature sensor voltage

CVT fluid temperature sensor output temperature)

More than 4.91 V

(Less than -48°C (-54.4°F)

COMPONENT OPERATING RANGE

CVT fluid temperature sensor voltage

CVT fluid temperature sensor output temperature)

0.14 to 4.91 V

(-48 to 164°C (-54.4 to 327.2°F)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Perform initialization when parts related to the continuously variable transaxle are replaced.

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

  • Perform the universal trip to clear permanent DTCs.

    Click here

HINT:

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

  1. Start the engine and wait for 15 minutes or more.
  2. Check for DTCs again.

    Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM (A/T OIL TEMPERATURE 1)

(a) Warm up the engine.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine and ECT / Data List.

Powertrain > Engine and ECT > Data List

Tester Display

A/T Oil Temperature 1

(f) In accordance with the display on the Techstream, read the Data List.

Powertrain > Engine and ECT > 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.: 150°C (302°F)

  • After stall speed test: approximately 100°C (212°F)
  • Equal to ambient temperature after cold soak

If the value is -40°C (-40°F) or 150°C (302°F) or higher, the CVT fluid temperature sensor circuit is open or shorted.

Result

Proceed to

Data display is not within Normal Condition range

A

Data display is within Normal Condition range

B

B

GO TO STEP 6

A

2.

INSPECT TRANSMISSION WIRE (CVT FLUID TEMPERATURE SENSOR)

(a) Disconnect the C40 transmission wire connector.

*a

Component without harness connected

(Transmission Wire)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (THO) - 7 (E2)

Always

79 Ω to 156 kΩ

1 (THO) - Body ground and other terminals

Always

10 kΩ or higher

7 (E2) - Body ground and other terminals

Always

10 kΩ or higher

HINT:

If the resistance is outside the specified range at any 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)

5.6 to 7.3 kΩ

25°C (77°F)

3.5 kΩ

110°C (230°F)

0.22 to 0.27 kΩ

NG

GO TO STEP 5

OK

3.

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

(a) Disconnect the ECM connector.

*a

Front view of wire harness connector

(to ECM)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C63-129 (THO1) - C63-130 (ETHO)

Always

79 Ω to 156 kΩ

C63-129 (THO1) - Body ground and other terminals

Always

10 kΩ or higher

C63-130 (ETHO) - Body ground and other terminals

Always

10 kΩ or higher

NG

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

OK

4.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

PERFORM INITIALIZATION

5.

REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

(a) Replace the continuously variable transaxle assembly.

  • When Not Using the Engine Support Bridge

    Click here

  • When Using the Engine Support Bridge

    Click here

NEXT

PERFORM INITIALIZATION

6.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

PERFORM INITIALIZATION

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