Toyota Yaris: Manual Transaxle System / Input/Turbine Speed Sensor "A" Circuit Short to Battery (P071512,P071514)

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Drivetrain / Ea67f (manual Transmission / Transaxle) / Manual Transaxle System / Input/Turbine Speed Sensor "A" Circuit Short to Battery (P071512,P071514)

DESCRIPTION

The transmission revolution sensor is mounted on the transaxle. The ECM calculates the transaxle input shaft speed using the sensor. When the input shaft rotates, the sensor generates a pulse signal and sends the signal to the ECM. The ECM calculates the input shaft speed based on the signal. If the input shaft speed falls below a threshold despite the engine running, the ECM interprets this as a malfunction in the transmission revolution sensor circuit. The ECM stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P071512	Input/Turbine Speed Sensor "A" Circuit Short to Battery	There is no malfunction in transmission revolution sensor (NIM) signals, and the transmission revolution sensor (NIM) output voltage is higher than 1.8 V for 2 seconds (1 trip detection logic).	Wire harness or connector Transmission revolution sensor ECM	Comes on	DTC stored	SAE Code: P07C0
P071514	Input/Turbine Speed Sensor "A" Circuit Short to Ground or Open	There is no malfunction in transmission revolution sensor (NIM) signals, and the transmission revolution sensor (NIM) output voltage is less than 0.2 V for 2 seconds (1 trip detection logic).	Wire harness or connector Transmission revolution sensor ECM	Comes on	DTC stored	SAE Code: P07BF

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P071512

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

There is no malfunction in transmission revolution sensor (NIM) signals, and the transmission revolution sensor (NIM) output voltage is higher than 1.8 V for 2 seconds (1 trip detection logic).

Wire harness or connector
Transmission revolution sensor
ECM

Comes on

DTC stored

SAE Code:

P07C0

P071514

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

There is no malfunction in transmission revolution sensor (NIM) signals, and the transmission revolution sensor (NIM) output voltage is less than 0.2 V for 2 seconds (1 trip detection logic).

Wire harness or connector
Transmission revolution sensor
ECM

Comes on

DTC stored

SAE Code:

P07BF

MONITOR DESCRIPTION

The transmission revolution sensor (NIM) detects the rotation speed of the input shaft. Based on comparison with the transmission revolution sensor (NIM) (input shaft rotation speed), the ECM determines the necessary gear ratio. If the output shaft rotation speed deviates from the threshold value, the ECM determines that the transmission revolution sensor (NIM) is malfunctioning, and so the ECM will illuminate the MIL and store a DTC.

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 GTS contacting the pedals, shift lever or steering wheel.
Driving the vehicle with the cable of the GTS contacting these areas could impede vehicle control, resulting in a serious accident.

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

PROCEDURE

1.	READ VALUE USING GTS (NIM SENSOR SPEED AND NIM SENSOR VOLTAGE)

(a) Enter the following menus.

Powertrain > Engine > Data List

Tester Display
NIM Sensor Speed
NIM Sensor Voltage

(b) According to the display on the GTS, read the Data List.

Powertrain > Engine > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
NIM Sensor Speed	Input shaft speed (NIM)	Min.: 0 rpm Max.: 16383 rpm	Input shaft speed (NIM) equal to engine speed (NE): Clutch pedal not depressed, vehicle running	Data is displayed in increments of 50 rpm.
NIM Sensor Voltage	Transmission revolution sensor (NIM) output voltage	Min.: 0.000 V Max.: 4.999 V	0.2 to 1.8 V: Engine idling (Vehicle stopped with shift lever in Neutral)	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

NIM Sensor Speed

Input shaft speed (NIM)

Min.: 0 rpm

Max.: 16383 rpm

Input shaft speed (NIM) equal to engine speed (NE): Clutch pedal not depressed, vehicle running

Data is displayed in increments of 50 rpm.

NIM Sensor Voltage

Transmission revolution sensor (NIM) output voltage

Min.: 0.000 V

Max.: 4.999 V

0.2 to 1.8 V: Engine idling (Vehicle stopped with shift lever in Neutral)

Result	Proceed to
Data List value is not normal	A
Data List value is normal	B

REPLACE ECM

2.	INSPECT TRANSMISSION REVOLUTION SENSOR

(a) Remove the transmission revolution sensor.

Click here

(b) Connect the auxiliary battery to the transmission revolution sensor as shown in the illustration.

Auxiliary Battery

Component without harness connected

(Transmission Revolution Sensor)

Magnet

5 mm or less

Ammeter

(c) Wave a magnetic object left and right 5 mm (0.197 in.) or less from the tip of the transmission revolution sensor to output a high/low signal while measuring the current.

NOTICE:

Make sure to wave the magnetic object during the inspection. The current will not change unless the magnetic object is moved as shown in the illustration.

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

Standard Current:

Tester Connection	Condition	Specified Condition
1 (NIMO) - 2 (NIMB)	Low signal	4 to 8 mA
1 (NIMO) - 2 (NIMB)	High signal	12 to 16 mA

REPLACE TRANSMISSION REVOLUTION SENSOR

3.	CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR - ECM)

(a) Disconnect the D99 transmission revolution sensor connector.

(b) Disconnect the D105 ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D99-1 (NIMO) - D105-54 (NIMO)	Always	Below 1 Ω
D99-2 (NIMB) - D105-53 (NIMB)	Always	Below 1 Ω
D99-1 (NIMO) or D105-54 (NIMO) - Body ground and other terminals	Always	10 kΩ or higher
D99-2 (NIMB) or D105-53 (NIMB) - Body ground and other terminals	Always	10 kΩ or higher

(d) Connect the D105 ECM connector.

(e) Connect the D99 transmission revolution sensor connector.

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION REVOLUTION SENSOR - ECM)

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