Last Modified: 11-29-2007 1.6 C
Service Category: Drivetrain Section: Automatic Transmission/Transaxle
Model Year: 2008 Model: Sequoia Doc ID: RM000000W7Y031X
Title: A750E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

P0717

Turbine Speed Sensor Circuit No Signal

DESCRIPTION

This sensor detects the rotation speed of the turbine which shows the input revolution of 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, thus providing smooth gear shift.



DTC No.

DTC Detection Condition

Trouble Area

P0717

All conditions below are detected for 5 seconds or more (1-trip detection logic)

(a) Gear change is not performed

(b) Gear position: 4th or 5th

(c) T/M input shaft rpm: 300 rpm or less

(d) T/M output shaft rpm: 1000 rpm or more

(e) Park/neutral position switch:

  • NSW input signal is OFF
  • R input signal is OFF

(f) Shift solenoid valves and park/neutral position switch are in normal operation
  • Open or short in speed sensor NT circuit
  • Speed sensor NT
  • ECM
  • Automatic transmission (clutch, brake or gear, etc.)

Using an oscilloscope:

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



Standard:

Refer to the illustration.

Item

Content

Terminal No. (Symbol)

D56-124 (NT+) - D56-123 (NT-)

Tool setting

1 V/DIV., 2 msec./DIV.

Condition

Engine is idling (Shift lever in P or N)

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 ECM detects the revolving signal from the speed sensor NT (input RPM). The ECM outputs a gear shift signal comparing the input speed sensor NT with the output speed sensor SP2.

While the vehicle is operating in the 4th or 5th gear position with the shift lever in D, if the input shaft revolution is less than 300 rpm*1 although the output shaft revolution is more than 1000 rpm or more*2, the ECM detects the trouble, illuminates the MIL and stores the DTC.

HINT:

  • *1: Pulse is not output or is irregularly output.
  • *2: The vehicle speed is approximately 50 km/h (30 mph) or more.

MONITOR STRATEGY

Related DTCs

P0717: Speed sensor (NT)/Verify pulse input

Required sensors/Components (Main)

Speed sensor (NT)

Required sensors/Components (Related)

Speed sensor (SP2)

Frequency of operation

Continuous

Duration

5 seconds

MIL operation

Immediately

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present

P0500: VSS

P0748 - P0799: Trans solenoid (range)

Shift change

Shift change is completed and before starting next shift change operation

ECM selected gear

4th or 5th

Output shaft rpm

1000 rpm or more

NSW switch

OFF

R switch

OFF

Engine

Running

Transmission position switch failure

Not detected

Battery voltage

8 V or more

Ignition switch

ON

Starter

OFF

TYPICAL MALFUNCTION THRESHOLDS

Speed sensor signal rpm

Less than 300 rpm

COMPONENT OPERATING RANGE

Speed sensor signal rpm

300 rpm or more

WIRING DIAGRAM

INSPECTION PROCEDURE

1. DATA LIST

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.

(a) Warm up the engine.

(b) Turn the ignition switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / ECT / Data List.

(g) According to the display on the Techstream, read the Data List.

ECT

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

SPD (NT)

Input shaft speed/

Min.: 0 rpm

Max.: 12750 rpm

Lock-up is

  • ON (after warming up engine): Input turbine speed (NT) is equal to engine speed
  • OFF (idling with shift lever in N): Input turbine speed (NT) is nearly equal to engine speed

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 of 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.
OK

2.

INSPECT SPEED SENSOR NT

(a) Disconnect the D43 speed sensor connector.

(b) 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
OK

3.

CHECK HARNESS AND CONNECTOR (SPEED SENSOR NT - ECM)

(a) Disconnect the D56 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D56-124 (NT+) - D56-123 (NT-)

20°C (68°F)

560 to 680 Ω

D56-124 (NT+) - Body ground

Always

10 kΩ or higher

D56-123 (NT-) - Body ground

Always

10 kΩ or higher
OK