K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P072012,P072014,P072031; Output Speed Sensor Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla Hatchback [11/2022

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM1000000028EL3
Model Year Start: 2023	Model: Corolla Hatchback	Prod Date Range: [11/2022 - ]
Title: K120 / K121 (CVT): K120 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P072012,P072014,P072031; Output Speed Sensor Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla Hatchback [11/2022 - ]

DTC

P072012

Output Speed Sensor Circuit Short to Battery

DTC

P072014

Output Speed Sensor Circuit Short to Ground or Open

DTC

P072031

Output Speed Sensor No Signal

DESCRIPTION

The transmission revolution sensor (NOUT) detects the output shaft speed and sends it to the TCM.

The TCM determines if belt mode has been entered by comparing the transmission revolution sensor (NOUT) and (NSS) signals.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P072012

Output Speed Sensor Circuit Short to Battery

The transmission revolution sensor (NOUT) signal is normal but the transmission revolution sensor (NOUT) output voltage is higher than 1.8 V for 4.5 seconds or more (1-trip detection logic).

Wire harness or connector
Transmission revolution sensor (NOUT)
TCM

Comes on

DTC stored

SAE Code:

P077D

P072014

Output Speed Sensor Circuit Short to Ground or Open

The transmission revolution sensor (NOUT) signal is normal but the transmission revolution sensor (NOUT) output voltage is less than 0.2 V for 4.5 seconds or more (1-trip detection logic).

Wire harness or connector
Transmission revolution sensor (NOUT)
TCM

Comes on

DTC stored

SAE Code:

P077C

P072031

Output Speed Sensor No Signal

Any of the following conditions are met for 5 seconds or more (1-trip detection logic):

When the transmission revolution sensor (NSS) signal indicates 350 rpm or more and the SPD signal indicates 11 km/h (7 mph) or more, the transmission revolution sensor (NOUT) signal indicates less than 300 rpm.
When the transmission revolution sensor (NC1) signal indicates 1180 rpm or more and the SPD signal indicates 11 km/h (7 mph) or more, the transmission revolution sensor (NOUT) signal indicates less than 300 rpm.

Wire harness or connector
Transmission revolution sensor (NOUT)
TCM

Comes on

DTC stored

SAE Code:

P0722

DTC Detection Condition Patterns (P072031):

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnostic Condition	The transmission revolution sensor (NSS) signal indicates 350 rpm or more.	○	-
	The transmission revolution sensor (NC1) signal indicates 1180 rpm or more.	-	○
	The SPD signal indicates 11 km/h (7 mph) or more.	○	○
Malfunction Condition	The transmission revolution sensor (NOUT) signal indicates less than 300 rpm.	○	○
Duration		5 seconds or more	5 seconds or more
Detection Logic		1-trip detection logic	1-trip detection logic

HINT:

DTC P072031 is stored when any of the above detection patterns is met.

MONITOR DESCRIPTION

The TCM receives signals from the transmission revolution sensor (NOUT) installed to the continuously variable transaxle and determines the output shaft speed in order to control the gear ratio.

If the TCM detects no signal from the transmission revolution sensor (NOUT) even while the vehicle is being driven, it will determine that the transmission revolution sensor (NOUT) is malfunctioning, illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P0722: Output speed sensor (Transmission revolution sensor (NOUT))/Verify pulse input P077C: Output speed sensor (Transmission revolution sensor (NOUT))/Range check (Low voltage) P077D: Output speed sensor (Transmission revolution sensor (NOUT))/Range check (High voltage)
Required sensors/Components	Transmission revolution sensor (NSS) Transmission revolution sensor (NOUT) Vehicle speed sensor
Frequency of operation	Continuous
Duration	P0722: 5 sec. P077C, P077D: 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

P0722

Output speed sensor range check fail (P077C, P077D) (Pending / MIL)	Not detected
D range position switch	ON
R range position switch	OFF
Park position switch	OFF
Neutral position switch	OFF
Engine	Running
Pressure control solenoid circuit fail (P08CA, P08CB, P0962, P0963, P0966, P0967, P2826, P2827, P282F, P2830) (Pending + MIL)	Not detected
Torque converter clutch pressure control solenoid circuit fail (P2763, P2764) (Pending + MIL)	Not detected
Vehicle speed	11 km/h (6.84 mph) or more

One of the following conditions is met: Condition (A) or (B) and Condition (C) or (D)

Condition (A)

Intermediate shaft speed sensor for belt drive revolution	350 rpm or more
One of the following conditions is met	-
- Speed sensor monitor driving mode	Belt mode (Synchronizer engaged)
- Speed sensor monitor driving mode	Belt mode (Synchronizer released)

Condition (B)

Intermediate shaft speed sensor for gear drive revolution	1180 rpm or more
Synchronizer	Engaged

Condition (C)

ECT	20°C (68°F) or more
ECT sensor circuit fail (P0117, P0118) (Pending + MIL)	Not detected
All of the following conditions are met	2 sec. or more
- Park position switch	OFF
- Neutral position switch	OFF

Condition (D)

One of the following conditions is met	-
- ECT	Less than 20°C (68°F)
- ECT sensor circuit fail (P0117, P0118) (Pending + MIL)	Detected
All of the following conditions are met	30 sec. or more
- Park position switch	OFF
- Neutral position switch	OFF

P077C, P077D

Output speed sensor pulse input fail (P0722)

(Pending / MIL)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0722

Output speed sensor revolution

Less than 300 rpm

P077C

Output speed sensor voltage

Less than 0.2 V

P077D

Output speed sensor voltage

More than 1.8 V

COMPONENT OPERATING RANGE

P0722

Output speed sensor revolution

300 rpm or more

P077C, P077D

Output speed sensor voltage

0.2 V or more and 1.8 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

Connect the Techstream to the DLC3.
Turn the engine switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for 2 minutes or more.
Turn the engine switch on (IG) and turn the Techstream on.
Start the engine.
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.
Stop the vehicle.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P072012, P072014 or P072031.

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 continuously variable transaxle system are replaced.
Click here
Check that no DTCs are stored after performing initialization.
Click here

PROCEDURE

1.	READ VALUE USING TECHSTREAM (NO SENSOR SPEED AND NO SENSOR VOLTAGE)

(a) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: Powertrain / Transmission / Data List.

(e) According to the display on the Techstream, read the Data List.

Powertrain > Transmission > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

NO Sensor Speed

Output shaft speed (NOUT)

Min.: 0 rpm

Max.: 65535 rpm

0 rpm: Vehicle stopped
Equal to NSS Sensor Speed: Vehicle being driven in belt mode

NO Sensor Voltage

Transmission revolution sensor (NOUT) output voltage

Min.: 0.000 V

Max.: 4.999 V

0.2 to 1.8 V: Engine idling (Vehicle stopped with shift lever in P or N)

Powertrain > Transmission > Data List

Tester Display
NO Sensor Speed
NO Sensor Voltage

Result	Proceed to
Data List values are normal	A
Data List values are not normal	B

GO TO STEP 3

2.	REPLACE TCM

(a) Replace the TCM.

Click here

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

3.	INSPECT TRANSMISSION REVOLUTION SENSOR (NOUT)

(a) Remove the transmission revolution sensor (NOUT).

Click here

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

Battery

Ammeter

Component without harness connected

(Transmission Revolution Sensor (NOUT))

Magnet

5 mm or less

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

NOTICE:

Make sure to wave the magnet during the inspection. The current will not change unless the magnet 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 (NOO) - 2 (NOB)	Low signal	4 to 8 mA
1 (NOO) - 2 (NOB)	High signal	12 to 16 mA

REPLACE TRANSMISSION REVOLUTION SENSOR (NOUT)

4.	CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR (NOUT) - TCM)

(a) Disconnect the C69 transmission revolution sensor (NOUT) connector.

(b) Disconnect the C80 TCM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C69-1 (NOO) - C80-10 (NOO)	Always	Below 1 Ω
C69-2 (NOB) - C80-26 (NOB)	Always	Below 1 Ω
C69-1 (NOO) or C80-10 (NOO) - Body ground and other terminals	Always	10 kΩ or higher
C69-2 (NOB) or C80-26 (NOB) - Body ground and other terminals	Always	10 kΩ or higher

(d) Connect the C80 TCM connector.

(e) Connect the C69 transmission revolution sensor (NOUT) connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION REVOLUTION SENSOR (NOUT) - TCM)

5.	REPLACE TCM

(a) Replace the TCM.

Click here

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here