Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - A750F AUTOMATIC TRANSMISSION / TRANSAXLE
INSPECT TRANSMISSION WIRE (NO. 1 ATF TEMPERATURE SENSOR)
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
DTC P0712 Transmission Fluid Temperature Sensor "A" Circuit Low Input
DTC P0713 Transmission Fluid Temperature Sensor "A" Circuit High Input
DESCRIPTION
The Automatic Transmission Fluid (ATF) temperature sensor converts the fluid temperature into a resistance value which is input into the ECM.
The ECM applies a voltage to the temperature sensor through the ECM terminal THO1.
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 ECM calculates the fluid temperature based on the voltage signal.
| DTC Code | DTC Detection Condition | Trouble Area |
| P0712 | The No. 1 ATF temperature sensor resistance is below 79 Ω for 0.5 seconds or more (1 trip detection logic). | Short in No. 1 ATF temperature sensor circuit No. 1 transmission wire (No. 1 ATF temperature sensor) ECM |
| P0713 | The No. 1 ATF temperature sensor resistance is higher than 156 kΩ for 0.5 seconds or more, and one of the following conditions is met (1 trip detection logic). Condition A: 15 minutes or more have elapsed. Condition B: If the conditions needed to detect DTC P0711 have been met, P0713 can be detected immediately following engine start. | Open in No. 1 ATF temperature sensor circuit No. 1 transmission wire (No. 1 ATF temperature sensor) ECM |
| DTC Code | DTC Detection Condition | Trouble Area |
| P0712 | The No. 1 ATF temperature sensor resistance is below 79 Ω for 0.5 sec. or more (1 trip detection logic). | Short in No. 1 ATF temperature sensor circuit Transmission wire (No. 1 ATF temperature sensor) ECM |
| P0713 | When 15 min. or more have elapsed after the engine is started, the No. 1 ATF temperature sensor resistance is higher than 156 kΩ for 0.5 sec. or more (1 trip detection logic). | Open in No. 1 ATF temperature sensor circuit Transmission wire (No. 1 ATF temperature sensor) ECM |
MONITOR DESCRIPTION
These DTCs indicate an open or short in the Automatic Transmission Fluid (ATF) temperature sensor circuit. The 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 short in the ATF temperature circuit. If the resistance value of the ATF temperature is below 79 Ω*1 or higher 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.
- HINT:
WIRING DIAGRAM
INSPECTION PROCEDURE
| DATA LIST |
- HINT:
- Using the intelligent tester 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.
Warm up the engine.
Turn the engine switch off.
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List.
According to the display on the tester, read the Data List.
| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| A/T Oil Temperature 1 | No. 1 ATF temperature sensor value/ Min.: -40°C (-40°F) Max.: 150°C (302°F) | After stall test: Approximately 80°C (176°F) With engine cold: Equal to ambient temperature | If the value is -40°C (-40°F) or 150°C (302°F), the No. 1 ATF temperature sensor circuit is open or shorted. |
- HINT:
- When DTC P0712 is stored and the intelligent tester output is 150°C (302°F) or higher, there is a short circuit.
- When DTC P0713 is stored and the intelligent tester output is -40°C (-40°F), there is an open circuit.
- Check the temperature displayed on the tester in order to check if a malfunction exists.
| Temperature Displayed | Malfunction |
| -40°C (-40°F) | Open circuit |
| 150°C (302°F) or higher | Short circuit |
| 1.INSPECT TRANSMISSION WIRE (NO. 1 ATF TEMPERATURE SENSOR) |
Disconnect the transmission wire connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 2 (OT-) - 10 (OT+) Always 79 Ω to 156 kΩ 2 (OT-) - Body ground Always 10 kΩ or higher 10 (OT+) - Body ground Always 10 kΩ or higher
- HINT:
- If the resistance is out of the specified range of one of the ATF temperatures shown in the table below, the driveability of the vehicle may decrease.
- Resistance (Reference):
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
| *a | Component without harness connected (No. 1 Transmission Wire) |
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| OK | |
| 2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition C45-122 (THO1) - C45-97 (ETHW) Always 79 Ω to 156 kΩ C45-122 (THO1) - Body ground Always 10 kΩ or higher C45-97 (ETHW) - Body ground Always 10 kΩ or higher
| *a | Front view of wire harness connector (to ECM) |
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| OK | ||
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