P0711

U660E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P0711: Transmission Fluid Temperature Sensor "A" Performance

DTC P0711 - Transmission Fluid Temperature Sensor "A" Performance

DESCRIPTION

The ATF (Automatic Transmission Fluid) temperature sensor converts the fluid temperature into a resistance value for use by the TCM.





The TCM applies a voltage to the temperature sensor through terminal OIL of the TCM.
The sensor resistance changes with the transmission fluid temperature. As the temperature becomes higher, the sensor resistance decreases.
One terminal of the sensor is grounded so that the sensor resistance decreases and the voltage goes down as the temperature becomes higher.
The TCM calculates the fluid temperature based on the voltage signal.






MONITOR DESCRIPTION

This DTC indicates that there is a problem with output signals from the automatic transmission fluid (ATF) temperature sensor (TFT sensor) and that the sensor itself is defective. The ATF temperature sensor converts the ATF temperature into an electrical resistance value. Based on the resistance, the TCM determines the ATF temperature and detects an open or short in the ATF temperature circuit or a fault of the ATF temperature sensor.
After running the vehicle for a certain period, the ATF temperature should increase. If the ATF temperature is below 20°C (68°F) after running the vehicle for a certain period, the TCM interprets this as a fault, and turns on the MIL.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

ALL:





Condition A:





Condition B:





Condition C:





Condition D:





TYPICAL MALFUNCTION THRESHOLDS

Condition A, B and C:





Condition D:





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

1. DATA LIST
HINT: Using Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.
NOTE:
In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty.

(a) Warm up the engine.
(b) Turn the engine switch off.
(c) Connect Techstream to the DLC3.
(d) Turn the engine switch on (IG).
(e) Turn on the tester.
(f) Enter the following items: "Powertrain / ECT / Data List".
(g) According to the display on the tester, read "Data List".





HINT: When DTC P0712 is output and Techstream indicates 150°C (302°F) or more, there is a short circuit.
When DTC P0713 is output and Techstream indicates -40°C (-40°F), there is an open circuit.
Measure the resistance between terminal THO1 (OT) and body ground.





HINT: If a circuit related to the ATF temperature sensor becomes open, P0713 is immediately set (in 0.5 seconds). When P0713 is set, P0711 cannot be detected.
It is not necessary to inspect the circuit when P0711 is set.

PROCEDURE

1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0711)
(a) Connect Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Select the items: "Powertrain / ECT / Trouble Codes".
(d) Read the DTCs using Techstream.
Result:





HINT: If any other codes besides "P0711" are output, perform troubleshooting for those DTCs first.

B -- GO TO DTC CHART
A -- Continue to next step.
2. CHECK TRANSMISSION FLUID LEVEL
(a) Check the transmission fluid level.
OK:
Automatic transmission fluid level is correct.
NG -- ADD FLUID
OK -- Continue to next step.
3. INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)




(a) Remove the TCM from the transaxle.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





HINT: If the resistance is out of the specified range with the ATF temperature shown in the table below, the driveability of the vehicle may decrease.





OK -- REPLACE TCM
NG -- Continue to next step.
4. CHECK ATF TEMPERATURE SENSOR




(a) Disconnect the ATF temperature sensor connector from the transmission wire.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





HINT: If the resistance is out of the specified range with the ATF temperature shown in the table below, the driveability of the vehicle may decrease.





NG -- REPLACE ATF TEMPERATURE SENSOR ASSEMBLY
OK -- REPLACE TRANSMISSION WIRE