Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Input/Turbine Speed Sensor "A" Circuit Short to Battery (P071512,P071514,P071531)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Drivetrain / U881e (automatic Transmission / Transaxle) / Automatic Transaxle System / Input/Turbine Speed Sensor "A" Circuit Short to Battery (P071512,P071514,P071531)

DESCRIPTION

The transmission revolution sensor (NT) detects the input shaft rotation speed and sends it to the ECM.

Based on the transmission revolution sensor (NT) signal and the transmission revolution sensor (NC3 and NC) signals, the ECM controls engine torque and shift timing. Based on the input shaft rotation speed and the engine speed signal, lock-up control is performed.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P071512

Input/Turbine Speed Sensor "A" Circuit Short to Battery

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other

  • The battery voltage is 8 V or more, the engine switch is on (IG) and the starter is off.
  • Transmission revolution sensor (NT) input voltage is more than 1.9 V
  • 4.5 seconds
  • 1-trip detection logic
  • Transmission revolution sensor (NT)
  • Transmission wire
  • Harness and connector
  • ECM

Comes on

DTC stored

SAE Code:

P07C0

P071514

Input/Turbine Speed Sensor "A" Circuit Short to Ground or Open

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other

  • The battery voltage is 8 V or more, the engine switch is on (IG) and the starter is off.
  • Transmission revolution sensor (NT) input voltage is less than 0.1 V
  • 4.5 seconds
  • 1-trip detection logic
  • Transmission revolution sensor (NT)
  • Transmission wire
  • Harness and connector
  • ECM

Comes on

DTC stored

SAE Code:

P07BF

P071531

Input/Turbine Speed Sensor "A" No Signal

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other

  • All of the following conditions are met:
    1. The battery voltage is 8 V or more.
    2. Park/neutral position switch D input signal is ON
    3. Speed indicated by transmission revolution sensor (NC) is 520 rpm or more
    4. The vehicle speed is 23 km/h (14 mph) or more.
    5. Vehicle being driven in 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear
  • Speed indicated by transmission revolution sensor (NT) is less than 300 rpm
  • 5 seconds
  • 1-trip detection logic
  • Transmission revolution sensor (NT)
  • Transmission wire
  • Harness and connector
  • ECM

Comes on

DTC stored

SAE Code:

P0717

MONITOR DESCRIPTION

The NT terminal of the ECM detects a pulse signal from the transmission revolution sensor (NT) (input RPM). The ECM calculates gear shifts by comparing input signals of the transmission revolution sensor (NT) with the transmission revolution sensor (NC3 and NC).

While the vehicle is being driven in 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear with the shift lever in D, if the input shaft revolution (speed) is less than 300 rpm*1 when the vehicle speed is 23 km/h (14 mph) or more, the ECM interprets this as a malfunction, illuminates the MIL and stores a DTC.

*: Pulse is not output or is irregularly output.

MONITOR STRATEGY

Related DTCs

P0717: Speed sensor (NT)/Verify pulse input

P07BF: Speed sensor (NT)/Range check (Low voltage)

P07C0: Speed sensor (NT)/Range check (High voltage)

Required sensors/Components

Speed sensor (NT), Speed sensor (NC3), Speed sensor (NC)

Frequency of operation

Continuous

Duration

P0717: 5 sec.

P07BF, P07C0: 4.5 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

Battery voltage

8 V or more

Engine switch

On (IG)

Starter

OFF
P0717

The monitor will run whenever the following DTCs are not present

P07BF, P07C0 (Turbine speed sensor circuit)

U0100 (CAN communication system)

P0746, P0748, P0776, P0778, P0796, P0798, P2716, P2808, P2810, P2817, P2819 (Pressure control solenoid circuit)

P0751, P0752, P0973, P0974 (Shift solenoid circuit)

Turbine speed sensor range check fail (P07BF, P07C0)

(Pending / MIL)

Not detected

Vehicle speed sensor

23 km/h (14.29 mph) or more

Intermediate shaft speed sensor revolution

520 rpm or more

Shift change is completed and before starting next shift change operation

-

ECM selected gear

Not 1st

Park/neutral position switch

OFF

R range position switch

OFF

D range position switch

ON

Engine

Running

Lost communication with ECM/PCM (U0100)

(Pending + MIL)

Not detected

Pressure control solenoid circuit fail (P0746, P0748, P0776, P0778, P0796, P0798, P2716, P2808, P2810, P2817, P2819)

(Pending + MIL)

Not detected

Shift solenoid circuit fail (P0751, P0752, P0973, P0974)

(Pending + MIL)

Not detected
P07BF, P07C0

The monitor will run whenever the following DTCs are not present

P0717 (Turbine speed sensor verify pulse input)

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

Less than 0.1 V
P07C0

Turbine speed sensor voltage

More than 1.9 V

COMPONENT OPERATING RANGE

Turbine speed sensor revolution

300 rpm or more

Turbine speed sensor voltage

0.1 V or more and 1.9 V or less

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.

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the engine switch off and wait for 2 minutes or more.
  5. Turn the engine switch on (IG) and turn the Techstream on.
  6. Start the engine.
  7. Perform the D Position Shift Test inspection in Road Test. [*1]

    Click here

    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

NOTICE:

  • Perform the universal trip to clear permanent DTCs.

    Click here

  • Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

    Click here

DATA LIST

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.

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.

(a) Warm up the engine.

(b) Turn the engine switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Transmission / Data List / NT Sensor Speed.

(g) Read the Data List according to the display on the Techstream.

Powertrain > Transmission > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

NT Sensor Speed

Input shaft speed

Min.: 0 rpm

Max.: 12750 rpm
  • Equal to engine speed: Lock-up on (after warming up engine)
  • Nearly equal to engine speed: Lock-up off (idling with shift lever in N)

Data is displayed in increments of 50 rpm
Powertrain > Transmission > Data List

Tester Display

NT Sensor Speed

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 50 km/h (31 mph) or more: Sensor malfunction, improper installation, or intermittent connection malfunction in the circuit.

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Transmission / Data List / NT Sensor Speed, NT Sensor Voltage.

(e) Read the Data List according to the display on the Techstream.

Powertrain > Transmission > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

NT Sensor Speed

Input shaft speed

Min.: 0 rpm

Max.: 12750 rpm
  • Equal to engine speed: Lock-up on (after warming up engine)
  • Nearly equal to engine speed: Lock-up off (idling with shift lever in N)

Data is displayed in increments of 50 rpm

NT Sensor Voltage

NT sensor voltage

Min.: 0.000 V

Max.: 4.999 V

0.1 to 1.9 V: Engine idling

-
Powertrain > Transmission > Data List

Tester Display

NT Sensor Speed

NT Sensor Voltage

Result

Proceed to

Data List value is normal

A

Data List value is not normal

B
A

GO TO STEP 5

B

2.

INSPECT TRANSMISSION REVOLUTION SENSOR (NT) (NT TERMINAL)

(a) Disconnect the D56 transmission wire connector.

*a

Front view of wire harness connector

(to Transmission Wire)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D56-2 (NTO) - Body ground

Always

99 to 101 Ω

(c) Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

D56-1 (NTB) - Body ground

Engine switch on (IG)

11 to 14 V
NG

GO TO STEP 4

OK

3.

INSPECT TRANSMISSION WIRE (TRANSMISSION REVOLUTION SENSOR (NT))

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

Click here

*a

Front view of wire harness connector

(to Transmission Revolution Sensor (NT))

*b

Component without harness connected

(Transmission Wire)

(b) Disconnect the D56 transmission wire connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Transmission revolution sensor (NT) connector terminal 1 - D56-1 (NTB)

Always

Below 1 Ω

Transmission revolution sensor (NT) connector terminal 2 - D56-2 (NTO)

Always

Below 1 Ω

Transmission revolution sensor (NT) connector terminal 1 or D56-1 (NTB) - Body ground

Always

10 kΩ or higher

Transmission revolution sensor (NT) connector terminal 2 or D56-2 (NTO) - Body ground

Always

10 kΩ or higher
OK

REPLACE TRANSMISSION REVOLUTION SENSOR (NT)

NG

REPAIR OR REPLACE TRANSMISSION WIRE

4.

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

(a) Disconnect the D56 transmission wire connector.

(b) Disconnect the D2 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D56-1 (NTB) - D2-75 (NTB)

Always

Below 1 Ω

D56-2 (NTO) - D2-74 (NTO)

Always

Below 1 Ω

D56-1 (NTB) or D2-75 (NTB) - Body ground

Always

10 kΩ or higher

D56-2 (NTO) or D2-74 (NTO) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM)
OK

5.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

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