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

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 ).

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for 2 minutes or more.
Turn the ignition switch to ON and turn the Techstream on.
Start the engine.
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 ). [*1]
HINT:

[*1] : Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P071512, P071514 or P071531.

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

NOTICE:

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

(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

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.

(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	-

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

REPLACE ECM

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

REPLACE TRANSMISSION REVOLUTION SENSOR (NT)

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.

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

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

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