A750E Automatic Transmission System

A750E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0717: Input Speed Sensor Circuit No Signal
P0717 - Input Speed Sensor Circuit No Signal

DESCRIPTION

This sensor detects the rotation speed of the turbine which shows the input revolution of the transmission. By comparing the input turbine speed signal (NT) with the counter gear speed sensor signal (SP2), the ECM 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.





Using an oscilloscope:

Check the waveform between terminals NT+ and NT- of the ECM connector.





Standard:

Refer to the illustration.





MONITOR DESCRIPTION

This DTC indicates that a pulse signal is not output from the speed sensor (NT) (Turbine (input) speed sensor) or is weak. The NT terminal of the ECM detects the revolving signal from speed sensor (NT) (input RPM). The ECM outputs a gearshift signal comparing the input speed sensor (NT) with the output speed sensor SP2. While the vehicle is operating in 4th or 5th gear in the shift position of D, if the input shaft revolution is less than 300 rpm*1 although the output shaft revolution is 1000 rpm or more*2, the ECM detects the trouble, illuminates the MIL, and stores the DTC.

*1: A pulse signal is not output or is irregularly output.

*2: The vehicle speed is approximately 50 km/h (31 mph) or more.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs DTC Check / Clear.

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 / Engine and ECT / Data List.

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

Engine and ECT





HINT
* SPD (NT) is always 0 while driving:
Open or short in the sensor or circuit.
* SPD (NT) is always less than 300 rpm while driving the vehicle at 50 km/h (31 mph) or more:
Sensor trouble, improper installation, or intermittent connection trouble in the circuit.

PROCEDURE

1. INSPECT SPEED SENSOR (NT) INSTALLATION

(a) Check the speed sensor (NT) installation.





OK:

The installation bolt is tightened properly and there is no clearance between the sensor and transmission case.

NG -- SECURELY INSTALL OR REPLACE SPEED SENSOR (NT)
OK -- Continue to next step.

2. INSPECT SPEED SENSOR (NT)

(a) Disconnect the speed sensor (NT) connector from the transmission.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPLACE SPEED SENSOR (NT) Removal
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (SPEED SENSOR (NT) - ECM)

(a) Connect the speed sensor (NT) connector.





(b) Disconnect the connector from the ECM.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal