Toyota 4Runner: Turbine Speed Sensor Circuit No Signal (P0717)

Toyota 4Runner Service Manual / Drivetrain / A750e Automatic Transmission / Transaxle / Automatic Transmission System / Turbine Speed Sensor Circuit No Signal (P0717)

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 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.

DTC Code	DTC Detection Condition	Trouble Area
P0717	All conditions are met for 5 sec. or more (1-trip detection logic): (a) Gear change: not performed. (b) Gear position: 4th or 5th. (c) T/M input shaft speed: 300 rpm or less. (d) T/M output shaft speed: 1000 rpm or more. (e) Park/neutral position switch: R input signal is OFF. (f) Shift solenoid valves and park/neutral position switch: in normal operation.	Open or short in speed sensor NT circuit Speed sensor NT ECM Automatic transmission (clutch, brake, gear, etc.)

DTC Code

DTC Detection Condition

Trouble Area

P0717

All conditions are met for 5 sec. or more (1-trip detection logic):

(a) Gear change: not performed.

(b) Gear position: 4th or 5th.

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

(e) Park/neutral position switch: R input signal is OFF.

(f) Shift solenoid valves and park/neutral position switch: in normal operation.

Open or short in speed sensor NT circuit
Speed sensor NT
ECM
Automatic transmission (clutch, brake, gear, etc.)

Reference: Inspect using an oscilloscope.

Check the waveform of the ECM connector.

Standard:

Terminal No. (Symbol)	Tool Setting	Condition	Specified Condition
B38-3 (NT+) - B38-4 (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 ECM detects the pulse signal from the speed sensor NT (input RPM). The ECM outputs a gear shift signal by comparing the input speed sensor NT signal with the output speed sensor SP2 signal.

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 ECM 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 (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 (NC)
Frequency of operation	Continuous
Duration	5 sec.
MIL operation	Immediate
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored	P0705 (Park/neutral position switch circuit) P0746, P0748 (Shift solenoid valve SL1) P0776, P0778 (Shift solenoid valve SL2) P0751, P0973, P0974 (Shift solenoid valve S1) P0756, P0976, P0977 (Shift solenoid valve S2)
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
R switch	OFF
Engine	Running
Battery voltage	8 V or higher
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

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).

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.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

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

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

Engine and ECT

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
SPD (NT)	Input shaft speed/ Min.: 0 rpm Max.: 12750 rpm	Lock-up ON (after warming up engine): Input turbine speed (NT) is equal to engine speed Lock-up 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.

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

SPD (NT)

Input shaft speed/

Min.: 0 rpm

Max.: 12750 rpm

Lock-up ON (after warming up engine): Input turbine speed (NT) is equal to engine speed
Lock-up 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 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.

Text in Illustration

*a	CORRECT
*b	INCORRECT

SECURELY INSTALL OR REPLACE SPEED SENSOR NT

2.	INSPECT SPEED SENSOR NT

(a) Disconnect the B34 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

Text in Illustration

*a	Component without harness connected (Speed Sensor NT)

REPLACE SPEED SENSOR NT

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

(a) Disconnect the B38 ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
B38-3 (NT+) - B38-4 (NT-)	20°C (68°F)	560 to 680 Ω
B38-3 (NT+) - Body ground	Always	10 kΩ or higher
B38-4 (NT-) - Body ground	Always	10 kΩ or higher

Text in Illustration

*a	Rear view of wire harness connector (to ECM)

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

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