Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Intermediate Shaft Speed Sensor "A" Circuit Short to Battery (P079112,P079114,P079131)

Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual / Drivetrain / U881e (automatic Transmission / Transaxle) / Automatic Transaxle System / Intermediate Shaft Speed Sensor "A" Circuit Short to Battery (P079112,P079114,P079131)

DESCRIPTION

The transmission revolution sensor (NC) detects the rotation speed of the counter gear which shows the output shaft speed of automatic transaxle assembly.

Based on the transmission revolution sensor (NC) signal and the transmission revolution sensor (NT and NC3) signals, the ECM controls engine torque and shift timing.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P079112

Intermediate Shaft 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 (NC) input signal voltage is more than 1.9 V
  • 2 seconds
  • 1-trip detection logic
  • Transmission revolution sensor (NC)
  • Transmission wire
  • Harness and connector
  • ECM

Comes on

DTC stored

SAE Code

P07C6

P079114

Intermediate Shaft 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 (NC) input signal voltage is less than 0.1 V
  • 2 seconds
  • 1-trip detection logic
  • Transmission revolution sensor (NC)
  • Transmission wire
  • Harness and connector
  • ECM

Comes on

DTC stored

SAE Code

P07C5

P079131

Intermediate Shaft 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. The vehicle speed is 16 km/h (10 mph) or more.
    4. Speed indicated by transmission revolution sensor (NT) is higher than specified value
  • Speed indicated by transmission revolution sensor (NC) is less than 300 rpm
  • 5 seconds
  • 1-trip detection logic
  • Transmission revolution sensor (NC)
  • Transmission wire
  • Harness and connector
  • ECM

Comes on

DTC stored

SAE Code

P0793

MONITOR DESCRIPTION

The transmission revolution sensor (NC) monitors the output shaft speed.

The ECM commands gear changes and controls the lock up timing based on the signals from the transmission revolution sensor (NC) and throttle position sensor.

If the vehicle is being driven at 16 km/h (10 mph) or more and the speed sensor (NC) signal sent to the ECM is less than 300 rpm, or if the transmission revolution sensor (NC) input signal voltage is less than 0.1 V or more than 1.9 V, the ECM will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0793: Speed sensor (NC)/Verify pulse input

P07C5: Speed sensor (NC)/Range check (Low voltage)

P07C6: Speed sensor (NC)/Range check (High voltage)

Required sensors/Components

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

Frequency of operation

Continuous

Duration

P0793: 5 sec.

P07C5 and P07C6: 2 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

Battery voltage

8 V or more

Engine switch

On (IG)

Starter

OFF

P0793

The monitor will run whenever the following DTCs are not present

P07C5, P07C6 (Intermediate shaft speed sensor circuit)

U0100 (CAN communication system)

P2716 (Pressure control solenoid circuit)

Intermediate shaft speed sensor range check fail (P07C5, P07C6)

(Pending / MIL)

Not detected

Vehicle speed

16 km/h (9.9 mph) or more

Shift change is completed and before starting next shift change operation

-

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 (P2716)

(Pending + MIL)

Not detected

  • One of the following condition is met: Condition (a), (b), (c), (d), (e), (f), (g) or (h) Condition (a)

    ECM selected gear

    1st

    Turbine Speed Sensor revolution

    1830 rpm or more

    Condition (b)

    ECM selected gear

    2nd

    Turbine Speed Sensor revolution

    1060 rpm or more

    Condition (c)

    ECM selected gear

    3rd

    Turbine Speed Sensor revolution

    680 rpm or more

    Condition (d)

    ECM selected gear

    4th

    Turbine Speed Sensor revolution

    510 rpm or more

    Condition (e)

    ECM selected gear

    5th

    Turbine Speed Sensor revolution

    430 rpm or more

    Condition (f)

    ECM selected gear

    6th

    Turbine Speed Sensor revolution

    350 rpm or more

    Condition (g)

    ECM selected gear

    7th

    Turbine Speed Sensor revolution

    300 rpm or more

    Condition (h)

    ECM selected gear

    8th

    Turbine Speed Sensor revolution

    300 rpm or more

P07C5, P07C6

The monitor will run whenever the following DTCs are not stored

P0793 (Intermediate shaft speed sensor verify pulse input)

Intermediate shaft speed sensor pulse input fail (P0793)

(Pending / MIL)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0793

Intermediate shaft speed sensor revolution

Less than 300 rpm

P07C5

Intermediate shaft speed sensor voltage

Less than 0.1 V

P07C6

Intermediate shaft speed sensor voltage

More than 1.9 V

COMPONENT OPERATING RANGE

Intermediate shaft speed sensor revolution

300 rpm or more

Intermediate shaft 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: P079112, P079114 or P079131.
  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 / NC 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

NC Sensor Speed

Counter gear speed

Min.: 0 rpm

Max.: 12750 rpm

-

-

Powertrain > Transmission > Data List

Tester Display

NC Sensor Speed

HINT:

  • NC Sensor Speed is always 0 while driving: Open or short in the sensor or circuit.
  • NC Sensor Speed is always more than 0 and less than 300 rpm while driving the vehicle at 16 km/h (10 mph) or more: Sensor malfunction, improper installation, or intermittent connection malfunction in the circuit.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (NC SENSOR SPEED AND NC SENSOR VOLTAGE)

(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 / NC Sensor Speed and NC 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

NC Sensor Speed

Counter gear speed

Min.: 0 rpm

Max.: 12750 rpm

-

-

NC Sensor Voltage

NC sensor voltage

Min.: 0.000 V

Max.: 4.999 V

0.1 to 1.9 V: Engine idling

-

Powertrain > Transmission > Data List

Tester Display

NC Sensor Speed

NC 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 (NC) (NC 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

D56-22 (NCO) - 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

D56-21 (NCB) - Body ground

Engine switch on (IG)

11 to 14 V

NG

GO TO STEP 4

OK

3.

INSPECT TRANSMISSION WIRE (TRANSMISSION REVOLUTION SENSOR (NC))

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

Click here

*a

Front view of wire harness connector

(to Transmission Revolution Sensor (NC))

*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 (NC) connector terminal 1 - D56-21 (NCB)

Always

Below 1 Ω

Transmission revolution sensor (NC) connector terminal 2 - D56-22 (NCO)

Always

Below 1 Ω

Transmission revolution sensor (NC) connector terminal 1 or D56-21 (NCB) - Body ground

Always

10 kΩ or higher

Transmission revolution sensor (NC) connector terminal 2 or D56-22 (NCO) - Body ground

Always

10 kΩ or higher

OK

REPLACE TRANSMISSION REVOLUTION SENSOR (NC)

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

D56-21 (NCB) - D2-73 (NCB)

Always

Below 1 Ω

D56-22 (NCO) - D2-72 (NCO)

Always

Below 1 Ω

D56-21 (NCB) or D2-73 (NCB) - Body ground

Always

10 kΩ or higher

D56-22 (NCO) or D2-72 (NCO) - 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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