U340E AUTOMATIC TRANSMISSION / TRANSAXLE AUTOMATIC TRANSAXLE SYSTEM P0712 Transmission Fluid Temperature Sensor "A" Circuit Low Input P0713 Transmission Fluid Temperature Sensor "A" Circuit High Input
DESCRIPTION
The ATF (Automatic Transmission Fluid) temperature sensor converts the fluid temperature into a resistance value which is input into the ECM.
The ECM applies voltage to the temperature sensor through ECM terminal THO1 (THO).
The sensor resistance changes with the ATF 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 ECM calculates the fluid temperature based on the voltage signal.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P0712 | Transmission Fluid Temperature Sensor "A" Circuit Low Input | ATF temperature sensor resistance is less than 79 Ω for 0.5 seconds or more (1-trip detection logic) | ·
Short in ATF temperature sensor circuit ·
Transmission wire (ATF temperature sensor) ·
ECM |
Comes on | DTC stored |
| P0713 | Transmission Fluid Temperature Sensor "A" Circuit High Input | ATF temperature sensor resistance is more than 156 kΩ for 0.5 seconds or more. Either of the following conditions is met (1-trip detection logic):
·
Condition (A): 600 seconds or more have elapsed after the engine start when engine coolant temperature or intake air temperature is -29.375°C (-20.875°F) or less. ·
Condition (B): 10 seconds or more have elapsed after the engine start when engine coolant temperature and intake air temperature are more than -29.375°C (- 20.875°F). |
·
Open in ATF temperature sensor circuit ·
Transmission wire (ATF temperature sensor) ·
ECM |
Comes on | DTC stored |
MONITOR DESCRIPTION
These DTCs indicate an open or short in the automatic transmission fluid (ATF) temperature sensor (TFT sensor) circuit. The automatic transmission fluid (ATF) temperature sensor converts ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature, and the ECM detects an open or a short in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 79 Ω*1 or more than 156 kΩ*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM 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 GTS display.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- NOTICE:
-
Perform initialization when parts related to the automatic transaxle are replaced.
-
Click hereDrivetrain>U340E AUTOMATIC TRANSMISSION / TRANSAXLE>AUTOMATIC TRANSAXLE SYSTEM>PRECAUTION
READ DATA LIST
- HINT:
-
Using the GTS 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 value listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.
Warm up the engine.
Turn the ignition switch off.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List.
According to the display on the GTS, read the Data List.
- Powertrain > Engine and ECT > Data List
-
Tester Display Measurement Item Range Normal Condition Diagnostic Note A/T Oil Temperature 1 ATF temperature sensor value Min.: -40°C (-40°F)
Max.: 215°C (419°F)·After stall test: Approximately 80°C (176°F)
·Equal to ambient temperature when engine cold
If the value is -40°C (-40°F) or 215°C (419°F), the ATF temperature sensor circuit is open or shorted.
- Powertrain > Engine and ECT > Data List
-
Tester Display A/T Oil Temperature 1 - 50003 234 406
- HINT:
-
When DTC P0712 is output and GTS output is 150°C (302°F), there is a short circuit.
-
When DTC P0713 is output and GTS output is -40°C (-40°F), there is an open circuit.
-
Measure the resistance between terminal THO1 (THO) and body ground.
Temperature Displayed Malfunction -40°C (-40°F) Open circuit 150°C (302°F) or more Short circuit
- HINT:
-
If a circuit related to the ATF temperature sensor becomes open, P0713 is stored immediately (in 0.5 second).
PROCEDURE
| *a | Component without harness connected
(Transmission Wire) |
Disconnect the transmission wire connector from the transaxle.
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
- 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.
| ATF 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 |
- Result:
Proceed to OK NG
OK
NG
Connect the transmission wire connector to the transaxle.
| *a | Front view of wire harness connector
(to ECM) |
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition B56-70 (THO1) - B56-71 (ETHO) Always 79 Ω to 156 kΩ
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check or short):
Tester Connection Condition Specified Condition B56-70 (THO1) - Body ground Always 10 kΩ or higher B56-71 (ETHO) - Body ground Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG