Drivetrain. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
A750F Automatic Transmission Transaxle. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
INSPECT SPEED SENSOR NT INSTALLATION
CHECK HARNESS AND CONNECTOR (SPEED SENSOR NT - TCM)
DTC P0717 Turbine Speed Sensor Circuit No Signal |
DESCRIPTION
This sensor detects the rotation speed of the turbine which indicates the input speed of the transmission. By comparing the input turbine speed signal NT with the counter gear speed sensor signal SP2, the TCM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. As a result, the gears shift smoothly.| DTC Code | DTC Detection Condition | Trouble Area |
| P0717 | All conditions are met for 5 sec. or more (1- trip detection logic): (a) Gear shift is not being performed. (b) Transmission is in 4th or 5th gear. (c) Transmission input shaft speed is 300 rpm or less. (d) Transmission output shaft speed is 1000 rpm or more. (e) Park/neutral position switch R input signal is OFF. (f) Shift solenoid valves and park/neutral position switch are normal. |
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Check the waveform of the TCM connector.
- Standard:
Terminal No. (Symbol) Tool Setting Condition Specified Condition C24-3 (NT+) - C24-2 (NT-) 1 V/DIV., 2 msec./ DIV. Engine idling (shift lever in P or N) Refer to illustration
MONITOR DESCRIPTION
This DTC indicates that a pulse is not output from the speed sensor NT (turbine (input) speed sensor) or is output only a little. The NT terminal of the TCM detects the pulse signal from the speed sensor NT (input turbine speed). The TCM outputs a gear shift signal by comparing the input speed sensor NT signal with the output speed sensor SP2.While the vehicle is operating in 4th or 5th gear with the shift lever in D, if the input shaft speed is less than 300 rpm*1 although the output shaft speed is 1000 rpm or more*2, the TCM detects the trouble, illuminates the MIL and stores the DTC.
- HINT:
- *1: A pulse is not output or is irregularly output.
- *2: The vehicle speed is approximately 50 km/h (31 mph) or more.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 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 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 ignition switch off.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / ECT / Data List.
According to the display on the GTS, read the Data List.
| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| SPD (NT) | Input shaft speed/ Min.: 0 rpm Max.: 12750 rpm |
| Data is displayed in increments of 50 rpm. |
- HINT:
- SPD (NT) is always 0 while driving:
Open or short in the sensor or circuit. - SPD (NT) is always more than 0 and less than 300 rpm while driving the vehicle at 50 km/h (30 mph) or more:
Sensor trouble, improper installation or intermittent connection trouble in the circuit.
| 1.INSPECT SPEED SENSOR NT INSTALLATION |
Check the speed sensor NT installation.
- OK:
- The installation bolt is tightened properly and there is no clearance between the sensor and transmission case.
Text in Illustration *a CORRECT *b INCORRECT
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| OK | |
| 2.INSPECT SPEED SENSOR NT |
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Disconnect the speed sensor connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 560 to 680 Ω
Text in Illustration *a Component without harness connected
(Speed Sensor NT)
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| OK | |
| 3.CHECK HARNESS AND CONNECTOR (SPEED SENSOR NT - TCM) |
Disconnect the TCM connector.
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Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition C24-3 (NT+) - C24-2 (NT-) 20°C (68°F) 560 to 680 Ω C24-3 (NT+) - Body ground Always 10 kΩ or higher C24-2 (NT-) - Body ground Always 10 kΩ or higher
Text in Illustration *a Rear view of wire harness connector
(to TCM)
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| OK | ||
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