Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Input/Turbine Speed Sensor "A" Circuit Short to Battery (P071512,P071514,P071531)

Toyota Tacoma 2015-2018 Service Manual / Ac60e Automatic Transmission / Transaxle / Automatic Transmission System(for 2gr-fks) / Input/Turbine Speed Sensor "A" Circuit Short to Battery (P071512,P071514,P071531)

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

SAE

P071512

When the transmission revolution sensor (NT) input voltage is higher than 1.9 V for 4.5 seconds or more (1 trip detection logic).

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

P07C0

P071514

When the transmission revolution sensor (NT) input voltage is below 0.1 V for 4.5 seconds or more (1 trip detection logic).

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

P07BF

P071531

Both of the following conditions (A) and (B) are met for 5 seconds or more (1 trip detection logic):

(A) Either of the following conditions (a) and (b) are met

(a) All of the following conditions are met:

  • Output shaft speed is 1000 rpm or more.
  • Park/neutral position switch D input signal is ON.
  • Gear position is 2nd, 3rd, 4th, 5th or 6th.
  • The vehicle speed is 25 km/h (15.54 mph) or more.

(b) All of the following conditions are met:

  • Vehicle speed at output speed sensor is 8.99 km/h (5.59 mph) or more.
  • Park/neutral position switch D input signal is ON.
  • Either of the following conditions (aa) or (bb) is met
    • (aa) Gear position is 1st and transmission revolution sensor (NT) is 1310 rpm or more
    • (bb) Gear position is 2nd, 3rd, 4th, 5th or 6th and transmission revolution sensor (NT) is 760 rpm or more

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

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

P0717

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 km/h (15.54 mph) or more.

MONITOR STRATEGY

Related DTCs

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

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

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

Required sensors/Components

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

Frequency of operation

Continuous

Duration

P07BF and P07C0: 4.5 sec.

P0717: 5 sec.

MIL operation

Immediately

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All:

The monitor will run whenever the following DTCs are not stored

None

Battery voltage

8 V or higher

P07BF and P07C0:

Turbine speed sensor pulse input fail (P0717)

Not detected

P0717: Verify pulse input

Either condition is met: Condition (A) or (B)

Condition (A):

Output shaft revolution

1000 rpm or more

Vehicle speed

25 km/h (15.54 mph) or more

Shift change

Shift change is completed before starting next shift change operation

ECM selected gear

Not 1st

Park/neutral position switch (NSW)

OFF

R position switch

OFF

D position switch

ON

Engine

Running

Turbine speed sensor range check fail (P07BF, P07C0)

(Pending / MIL)

Not detected

Pressure Control Solenoid circuit fail (P0748, P0778, P0798, P2716, P2810)

(Pending / MIL)

Not detected

Condition (B):

Vehicle speed at output speed sensor

8.99 km/h (5.59 mph) or more

Shift change

Shift change is completed before starting next shift change operation

R position switch

OFF

D position switch

ON

Park/neutral position switch (NSW)

OFF

Engine

Running

Pressure control solenoid circuit fail (P0748, P0778, P0798, P2716, P2810)

(Pending / MIL)

Not detected

Either of the following conditions is met

Conditions 1 or 2

1. All of the following conditions are met

-

ECM selected gear

1st

Turbine speed sensor revolution

1310 rpm or more

2. All of the following conditions are met

-

ECM selected gear

Not 1st

Turbine speed sensor revolution

760 rpm or more

TYPICAL MALFUNCTION THRESHOLDS

P07C0:

Turbine speed sensor voltage

Higher than 1.9 V

P07BF:

Turbine speed sensor voltage

Below 0.1 V

P0717 Condition (A) and (B):

Turbine speed sensor revolution

Less than 300 rpm

COMPONENT OPERATING RANGE

Transmission revolution sensor (NT)

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

CONFIRMATION DRIVING PATTERN

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

  • After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
  • When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure (See page ).
  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 2 minutes or more.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Start the engine.
  7. Perform the D Position Shift Test inspection in Road Test and drive the vehicle for 5 seconds or more at 25 km/h (15.54 mph) or more (See page HINT: ). [*1]

    HINT:

    [*1] : Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  8. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  9. Input the DTC: P071512, P071514 or P071531.
  10. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

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 ).

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 / Transmission / Data List.

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

Transmission

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

NT Sensor Speed

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:

  • NT Sensor Speed is always 0 while driving: Open or short in the sensor or circuit.
  • NT Sensor Speed 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 (NT SENSOR SPEED 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 / Transmission / Data List

(e) In accordance with the display on the Techstream, read the Data List.

Transmission

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

NT Sensor Speed

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 E12 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) - E12-32 (NTB)

Always

Below 1 Ω

T6-1 (NTO) - E12-31 (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

Pressure Control Solenoid "G" Circuit Open (P280713)
DESCRIPTION Changing from 1st to 6th is performed by the ECM turning shift solenoid valves SL1, SL2, SL3 and SL4 on and off. If an open or short circuit occurs in any of the shift solenoid valves ...

Output Speed Sensor Circuit Short to Battery (P072012,P072014,P072031)
DESCRIPTION This sensor detects the rotation speed of the transmission output shaft and sends signals to the ECM. By comparing the input turbine speed signal (NT) with the output shaft speed sens ...

Other materials:

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION The ECM stores DTCs (Diagnostic Trouble Codes) when trouble occurs on the vehicle. The diagnosis system allows reading of DTCs stored in the ECM when a the Techstream is connected to the DLC3 (Data Link Connector 3). If the CRUISE MAIN indicator light does not ...

Components
COMPONENTS ILLUSTRATION *A for Driver Side - - *1 FRONT SEAT CUSHION HEATER ASSEMBLY *2 SEPARATE TYPE FRONT SEAT CUSHION COVER *3 TAG PIN - - ...

Inspection
INSPECTION PROCEDURE 1. INSPECT TIRES (a) Check the tires for wear and proper inflation pressure. Standard Cold Tire Inflation Pressure: Tire Size Front Wheel kPa (kgf/cm2, psi) Rear Wheel kPa (kgf/cm2, psi) Spare Wheel kPa (kgf/cm2, psi) ...

© 2011-2018 Copyright www.ttguide.net