Automatic Transmission - U660E

U660E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P0712,P0713: Transmission Fluid Temperature Sensor "A" Circuit Low Input


DESCRIPTION

The Automatic Transmission Fluid (ATF) 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 THO1 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

These DTCs indicate an open or short in the automatic transmission fluid (ATF) temperature sensor circuit. The automatic transmission fluid (ATF) temperature sensor converts ATF temperature into an electrical resistance value. Based on the resistance, the TCM determines the ATF temperature, and the TCM detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 79 Ohms*1 or more than 156 kOhms*2, the TCM interprets this as a fault in the ATF sensor or wiring. The TCM will turn on the MIL and store the DTC.

*1: 150°C (302°F) or more is indicated regardless of the actual ATF temperature.

*2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.

HINT
The ATF temperature can be checked on the Techstream display.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

*
P0712: Range check (Low resistance)

P0712: Range check (Low resistance):

P0713: Range check (High resistance)

* One of the following conditions is met: Condition (A) or (B)

Condition (A)

*





Condition (B)

* The condition (A) of "TYPICAL ENABLING CONDITIONS" for DTC P0711 is met

TYPICAL MALFUNCTION THRESHOLDS

P0712: Range check (Low resistance)

P0712: Range check (Low resistance):

P0713: Range check (High resistance)

P0713: Range check (High resistance):

COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs .

HINT
Using the 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.

NOTICE:
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 or not.

1. Warm up the engine.

2. Turn the ignition switch off.

3. Connect the Techstream to the DLC3.

4. Turn the ignition switch to ON.

5. Turn the Techstream on.

6. Enter the following menus: Powertrain / ECT / Data List.

7. According to the display on the Techstream, read the Data List.

TCM

TCM:

HINT
When DTC P0712 is output and the Techstream indicates 150°C (302°F) or more, there is a short circuit.

When DTC P0713 is output and the Techstream indicates -40°C (-40°F), there is an open circuit.

Measure the resistance between terminal THO1 (OT) and body ground.





HINT
If the 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. 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.





NG -- INSPECT ATF TEMPERATURE SENSOR

OK -- REPLACE TCM

2. INSPECT 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