Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - A750F AUTOMATIC TRANSMISSION / TRANSAXLE
INSPECT TRANSMISSION WIRE (NO. 2 ATF TEMPERATURE SENSOR)
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
DTC P2742 Transmission Fluid Temperature Sensor "B" Circuit Low Input
DTC P2743 Transmission Fluid Temperature Sensor "B" Circuit High Input
DESCRIPTION
The Automatic Transmission Fluid (ATF) temperature sensor is on the transmission, just in front of the oil cooler inlet pipeline.
If the ECM detects an abnormally high ATF temperature near this sensor, it illuminates the warning light.
- HINT:
Vehicle conditions when the sensor is normal and when the sensor is short-circuited are indicated in the table below.
| No. 2 ATF Temperature Sensor State | Detection Condition | Symptom | Recovery Condition |
| Sensor is normal | ATF temperature higher than 150°C (302°F) | ATF temperature warning light remains ON | ATF temperature less than 135°C (275°F)*1 |
| ATF temperature higher than 130°C (266°F) | Shift point too high | ATF temperature less than 110°C (230°F) | |
| When conditions (a) and (b) are satisfied. (a) ATF temperature higher than 130°C (266°F) (b) Engine coolant temperature higher than 95°C (203°F) | Lock-up at 3rd gear*2 | ATF temperature less than 110°C (230°F)*1 and engine coolant temperature higher than 95°C (203°F) | |
| Sensor is short-circuited | Any conditions | ATF temperature warning light blinks or message is displayed in combination meter Shift point too high | Symptoms still occur |
| Engine coolant temperature higher than 95°C (203°F) | Lock-up at 3rd gear*2 | Symptoms still occur |
- HINT:
- *1: When the ATF temperature is in the normal range, it decreases to below 135°C (275°F) within 5 minutes with the shift lever in P or N in an idling state.
- *2: When the ATF temperature is normal, transmission lock-up occurs in 5th gear with the shift lever in D, and 4th gear with the shift lever in the S4 range.
| DTC Code | DTC Detection Condition | Trouble Area |
| P2742 | The No. 2 ATF temperature sensor resistance is below 25 Ω (0.046 V) for 0.5 sec. or more (1 trip detection logic). | Short in No. 2 ATF temperature sensor circuit Transmission wire (No. 2 ATF temperature sensor) ECM |
| P2743 | When 15 min. or more have elapsed after the engine is started, the No. 2 ATF temperature sensor resistance is higher than 156 kΩ (4.915 V) for 0.5 sec. or more (1 trip detection logic). | Open in No. 2 ATF temperature sensor circuit Transmission wire (No. 2 ATF temperature sensor) ECM |
MONITOR DESCRIPTION
The ATF temperature sensor converts ATF temperature into 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 25 Ω*1 or higher than 156 kΩ*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM stores a DTC, and the ATF temperature warning light blinks or a message is displayed in the combination meter.
- HINT:
WIRING DIAGRAM
Refer to DTC P0712 ().
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 2 | No. 2 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. 2 ATF temperature sensor circuit is open or shorted. |
- HINT:
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. 2 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 1 (OT2-) - 9 (OT2+) Always 25 Ω to 156 kΩ 1 (OT2-) - Body ground Always 10 kΩ or higher 9 (OT2+) - 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 (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 C45-99 (THO2) - C45-97 (ETHW) Always 25 Ω to 156 kΩ C45-99 (THO2) - 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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