Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: 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 (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.

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 (NC).

While the vehicle is being driven in 1st, 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* when the vehicle speed is 25 km/h (16 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

TYPICAL ENABLING CONDITIONS

• Condition (A)

  ECM selected gear	1st
  Turbine speed sensor revolution	1450 rpm or more

  Condition (B)

  ECM selected gear	2nd
  Turbine speed sensor revolution	840 rpm or more

  Condition (C)

  ECM selected gear	3rd
  Turbine speed sensor revolution	540 rpm or more

  Condition (D)

  ECM selected gear	4th
  Turbine speed sensor revolution	400 rpm or more

  Condition (E)

  ECM selected gear	5th
  Turbine speed sensor revolution	330 rpm or more

  Condition (F)

  ECM selected gear	6th
  Turbine speed sensor revolution	300 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

• Condition (I)

  ECT	20°C (68°F) or more
  ECT sensor circuit fail (P0117, P0118) (Pending + MIL)	Not detected
  Time after park/neutral position switch ON to OFF	2 sec. or more

  Condition (J)

  Either of the following conditions is met	(a) or (b)
  (a) ECT	Less than 20°C (68°F)
  (b) ECT sensor circuit fail (P0117, P0118) (Pending + MIL)	Detected
  Time after park/neutral position switch ON to OFF	30 sec. or more

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

CONFIRMATION DRIVING PATTERN

CAUTION:

When performing the D Position Shift Test inspection in Road Test, 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. Stop the vehicle.
9. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
10. Input the DTC: P071512, P071514 or P071531.
11. 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:

• Strictly observe posted speed, limits, traffic laws and road conditions.
• Do not drive the vehicle with the cable of the Techstream contacting the pedals, shift lever or steering wheel.
• Driving the vehicle with the cable of the Techstream contacting these areas could impede vehicle control, resulting in a serious accident.

• Do not operate the Techstream while driving the vehicle.
• Operating the Techstream while driving the vehicle will prevent you from paying sufficient attention to vehicle surroundings, and could result in a serious accident.

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.

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

(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 and NT Sensor Voltage.

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

A

GO TO STEP 5

B

(a) Disconnect the C52 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.

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

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

Standard Voltage:

NG

GO TO STEP 4

OK

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

*1 Transmission Wire *a Transmission Revolution Sensor (NT) Side *b Wire Harness Connector Side

(b) Disconnect the C52 transmission wire connector.

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

OK

REPLACE TRANSMISSION REVOLUTION SENSOR (NT)

NG

REPAIR OR REPLACE TRANSMISSION WIRE

(a) Disconnect the C52 transmission wire connector.

(b) Disconnect the C56 ECM connector.

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

Standard Resistance:

NG

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

OK

(a) Replace the ECM.

Click here

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