Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM0000018N900SX
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: A750F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0717; Input Speed Sensor Circuit No Signal; 2007 MY LX470 [08/2006 -        ]

DTC

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 speed signal (NT) with the counter gear speed sensor signal (SP2), the ECM detects the shift timing of the gears and controls the engine torque and hydraulic pressure according to various conditions, providing smooth gear shift.

DTC No.

DTC Detection Condition

Trouble Area

P0717
  • All conditions below are detected for 5 sec. or more

    (1 trip detection logic):

    1. Gear changes not performed
    2. Gear position: 4th or 5th
    3. Transmission input shaft rpm: 300 rpm or less
    4. Transmission output shaft rpm: 1,000 rpm or more
    5. PNP switch is OFF
    6. Shift solenoid valves and PNP switch are operating normally
  • Open or short in speed sensor NT circuit
  • Speed sensor NT
  • ECM
  • Automatic transmission (clutch, brake or gear, etc.)

1. Reference: Inspect using an oscilloscope.

Check the waveform of the ECM connector.

Standard voltage:

Refer to illustration

Item

Content

Tester Connection

E7-35 (NT+) - E7-27 (NT-)

Tool Setting

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

Condition

Engine idle speed (shift lever on P or N)

MONITOR DESCRIPTION

This DTC indicates that a pulse is not output from the speed sensor NT (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 on D, if the input shaft revolution is less than 300 rpm *1 although the output shaft revolution is 1,000 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 (31 mph) or more.

MONITOR STRATEGY

Related DTCs

P0717: Speed sensor (NT)/Verify pulse input

Required sensors/Components

Speed sensor (NT), Speed sensor (NO)

Frequency of operation

Continuous

Duration

5 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever this DTC is not present.

P0500: VSS

P0748: Trans solenoid (range)

Shift change

Shift change is completed before starting next shift change operation

ECM selected gear

4th or 5th

Output shaft rpm

1,000 rpm or more

NSW switch

OFF

R switch

OFF

L switch

OFF

Engine

Running

Ignition switch

ON

Starter

OFF

TYPICAL MALFUNCTION THRESHOLDS

Sensor signal rpm

Less than 300 rpm

COMPONENT OPERATING RANGE

Speed sensor (NT)

Input speed is equal to engine speed when lock-up ON.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

Using the intelligent tester's DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to save 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 intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
  4. Turn the ignition switch ON.
  5. Turn the intelligent tester ON.
  6. Enter the following menus: DIAGNOSIS / OBD/MOBD / ECT / DATA LIST.
  7. Follow the instructions on the tester and read the DATA LIST.

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

SPD(NT)

Input shaft speed/

Min.: 0 rpm

Max.: 12,750 rpm

Lock-up is

  • ON (after warming up engine): Input turbine speed (NT) is equal to engine speed
  • OFF (idling with shift lever on 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 (31 mph) or more:

    Sensor trouble, improper installation, or intermittent connection trouble of the circuit.

PROCEDURE

1.

INSPECT SPEED SENSOR INSTALLATION

(a) Check the speed sensor NT installation.

OK:

Installation bolt is tightened properly and there is no clearance between the sensor and transmission case.
NG

SECURELY INSTALL SENSOR OR REPLACE SENSOR

OK

2.

INSPECT SPEED SENSOR NT

(a) Disconnect the T25 sensor connector from the transmission.

(b) Measure the resistance of the sensor.

Standard resistance:

Tester Connection

Condition

Specified Condition

1 - 2

20°C (68°F)

560 to 680 Ω
NG

REPLACE SPEED SENSOR NT

OK

3.

CHECK WIRE HARNESS (SPEED SENSOR - ECM)

(a) Check wire harness 2007 MY LX470 [08/2006 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE ECM