Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Input Speed Sensor Circuit No Signal (P0717,P07BF,P07C0)

DESCRIPTION

This sensor detects the rotation speed of the turbine which shows the input turbine speed of the transmission. By comparing the input turbine speed signal (NT) with the output shaft 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 No.

DTC Detection Condition

Trouble Area

P0717

All conditions are met for 5 seconds or more (1 trip detection logic):

(a) Park/neutral position switch D input signal is ON.

(b) Gear position is 2nd, 3rd, 4th, 5th or 6th.

(c) Transmission output shaft speed is 1000 rpm or more.

(d) The vehicle speed is 25.00534 km/h (15.5376009944065 mph) or more.

(e) Transmission revolution sensor (NT) value is less than 300 rpm.

  • Harness or connector
  • Transmission revolution sensor (NT)
  • ECM

P07BF

When the transmission revolution sensor (NT) input voltage is below 0.2 V for 4.5 seconds or more (1 trip detection logic).

  • Harness or connector
  • Transmission revolution sensor (NT)
  • ECM

P07C0

When the transmission revolution sensor (NT) input voltage is higher than 1.8 V for 4.5 seconds or more (1 trip detection logic).

  • Harness or connector
  • Transmission revolution sensor (NT)
  • ECM

MONITOR DESCRIPTION

The transmission revolution sensor (NT) detects the transmission input shaft speed. The ECM calculates gear shifts comparing the transmission revolution sensor (NT) with the transmission revolution sensor (SP2).

While the vehicle is operating in 2nd, 3rd, 4th, 5th or 6th gear with the shift lever in D, if the input shaft speed is less than 300 rpm*1 and the output shaft speed is more than 1000 rpm*2, the ECM interprets this as a fault, illuminates the MIL and stores the DTC.

*1: Pulse is not output or is irregularly output.

*2: The vehicle speed is 25.00534 km/h (15.5376009944065 mph) or more.

MONITOR STRATEGY

Related DTCs

P0717: Transmission revolution sensor (NT)/Verify pulse input

P07BF: Transmission revolution sensor (NT)/Range check (Low voltage)

P07C0: Transmission revolution sensor (NT)/Range check (High voltage)

Required sensors/Components

Transmission revolution sensor (NT), Transmission revolution sensor (SP2)

Frequency of operation

Continuous

Duration

P0717: 5 sec.

P07BF and P07C0: 4.5 sec.

MIL operation

Immediately

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All:

Battery voltage

8 V or higher

Ignition switch

ON

Starter

OFF

P0717:

The monitor will run whenever the following DTCs are not stored

P0746, P0748 (Shift solenoid valve SL1 circuit)

P0776, P0778 (Shift solenoid valve SL2 circuit)

P0796, P0798 (Shift solenoid valve SL3 circuit)

P2808, P2810 (Shift solenoid valve SL4 circuit)

Park/neutral position switch (NSW)

OFF

Shift change

Shift change is completed before starting next shift change operation

ECM selected gear

Not 1st

Output shaft revolution

1000 rpm or more

R position switch

OFF

Engine

Running

Vehicle speed

25.00534 km/h (15.5376009944065 mph) or more

Transmission range switch circuit fail (P0705)

(Pending + MIL)

Not detected

Turbine speed sensor range check fail (P07BF, P07C0)

(Pending / MIL)

Not detected

P07BF and P07C0:

Turbine speed sensor pulse input fail (P0717)

(Pending / MIL)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0717:

Turbine speed sensor revolution

Less than 300 rpm

P07BF:

Turbine speed sensor voltage

Below 0.2 V

P07C0:

Turbine speed sensor voltage

Higher than 1.8 V

COMPONENT OPERATING RANGE

Transmission revolution sensor (NT)

Turbine speed is equal to engine speed with lock-up ON

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

  • Perform the universal trip to clear permanent DTCs (See page Perform registration and/or initialization when parts related to the ).
  • Perform registration and/or initialization when parts related to the automatic transmission are replaced (See page ).

HINT:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

  1. Perform the D Position Shift Test in Road Test and drive the vehicle for 5 seconds or more at 25 km/h (15.54 mph) or more (See page Check for DTCs again (See page  ). ).
  2. Check for DTCs again (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.

(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 / 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 the engine): Value from transmission revolution sensor (NT) equal to engine speed
  • Lock-up off (idling with shift lever in N): Value from transmission revolution sensor (NT) 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 25 km/h (15.54 mph) or more: Sensor trouble, improper installation, or intermittent connection trouble of the circuit.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (SPD (NT) AND NT SENSOR VOLTAGE)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) In accordance with 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 the engine): Value from transmission revolution sensor (NT) equal to engine speed
  • Lock-up off (idling with shift lever in N): Value from transmission revolution sensor (NT) nearly equal to engine speed

Data is displayed in increments of 50 rpm

NT Sensor Voltage

Transmission revolution sensor (NT) output voltage/

Min.: 0.000 V

Max.: 4.999 V

0.1 to 1.9 V: Engine idling

-

Result

Result

Proceed to

Data display is not within Normal Condition range

A

Data display is within Normal Condition range

B

B

REPLACE ECM

A

2.

INSPECT TRANSMISSION REVOLUTION SENSOR (NT)

(a) Remove the transmission revolution sensor (NT) (See page (b) Connect the battery to the sensor as shown in the illustration. ).

(b) Connect the battery to the sensor as shown in the illustration.

Text in Illustration

*1

Transmission Revolution Sensor (NT)

*2

Ammeter

*3

Battery

*4

Magnet

*a

5 mm (0.197 in.) or less

-

-

(c) Wave a magnetic object left and right in front of the transmission revolution sensor (NT) tip (5 mm (0.197 in.) or less) to change the high/low signals while measuring the current.

NOTICE:

Make sure to wave the magnetic object during the inspection. The current will not change without waving the magnetic object as indicated by the arrow in the illustration.

(d) Measure the current according to the value(s) in the table below.

Standard Current:

Tester Connection

Condition

Specified Condition

1 (NTO) - 2 (NTB)

Low signal

4 to 8 mA

1 (NTO) - 2 (NTB)

High signal

12 to 16 mA

NG

REPLACE TRANSMISSION REVOLUTION SENSOR (NT)

OK

3.

CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR (NT) - ECM)

(a) Disconnect the T6 transmission revolution sensor (NT) connector.

(b) Disconnect the E19 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T6-2 (NTB) - E19-29 (NTB)

Always

Below 1 Ω

T6-1 (NTO) - E19-19 (NTO)

Always

Below 1 Ω

T6-2 (NTB) - Body ground

Always

10 kΩ or higher

T6-1 (NTO) - Body ground

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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