Toyota CH-R Service Manual: Transmission Fluid Temperature Sensor Circuit Range / Performance (P0711)

Toyota CH-R Service Manual / K114 Cvt / Continuously Variable Transaxle System / Transmission Fluid Temperature Sensor Circuit Range / Performance (P0711)

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

P0711

Transmission Fluid Temperature Sensor Circuit Range / Performance

Either one of the following conditions is met (2 trip detection logic):

  • The intake air and engine coolant temperatures were more than -10°C (14°F) at engine start, and the CVT fluid temperature remains below 20°C (68°F) for 3 seconds when the vehicle has been driven for over 18 minutes and 7 km (4.375 miles).
  • The engine coolant temperature was less than 35°C (95°F) at engine start, and the CVT fluid temperature remains more than 100°C (212°F) for 10 seconds.
  • CVT fluid level
  • Continuously variable transaxle assembly (CVT fluid temperature sensor)

Comes on

DTC stored

DTC Detection Condition Patterns:
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnostic Condition

The intake air and engine coolant temperatures were more than -10°C (14°F) at engine start, and the vehicle has been driven for over 18 minutes at 7 km (4.375 miles).

-

The engine coolant temperature was less than 35°C (95°F) at engine start.

-

Malfunction Condition

The CVT fluid temperature is below 20°C (68°F).

-

The CVT fluid temperature remains more than 100°C (212°F).

-

Duration

3 seconds or more

10 seconds or more

Detection Logic

2 trip detection logic

2 trip detection logic

HINT:

This DTC is output when either of the above detection patterns is met.

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 open or short circuits in the CVT fluid temperature circuit.

After driving the vehicle for a certain period, the CVT fluid temperature should increase. If the CVT fluid temperature remains below 20°C (68°F), the ECM interprets this as a fault and illuminates the MIL.

When the engine coolant temperature reaches 35°C (95°F) after a cold engine start, if the CVT fluid temperature is 100°C (212°F) or higher, the ECM also determines this as a fault, illuminates the MIL, and stores this DTC.

MONITOR STRATEGY

Related DTCs

P0711: CVT fluid temperature sensor / Rationality check

Required sensors/Components

Continuously variable transaxle assembly

(CVT fluid temperature sensor)

Frequency of operation

Continuous

Duration Conditions

3 seconds

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL MALFUNCTION THRESHOLDS

Condition (A), (B), (C) and (D):

Transmission Fluid Temperature

Less than 20°C (68°F)

Condition (E):

Transmission Fluid Temperature

100°C (212°F) or more

COMPONENT OPERATING RANGE

Transmission Fluid Temperature

20 to 100°C (68 to 212°F)

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. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Enter the following menus: Powertrain / Engine and ECT / Data List / AT Oil Temperature 1.
  5. Drive the vehicle and check that the Data List value (AT Oil Temperature 1) is between 20 to 100°C (68 to 212°F).
  6. Check for DTCs again.

    Click here

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P0711)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

(e) Read the DTCs using the Techstream.

HINT:

If any DTCs other than P0711 are output, perform troubleshooting for those DTCs first.

Result

Proceed to

Only DTC P0711 is output

A

DTC P0711 and other DTCs are output

B

B

GO TO DTC CHART

A

2.

CHECK CVT FLUID LEVEL

(a) Check the CVT fluid level.

Click here

OK:

CVT fluid level is correct.

NG

ADD FLUID

OK

3.

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

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