M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P071512,P071514; Input/Turbine Speed Sensor "A" Circuit Short to Battery; 2020 - 2021 MY Corolla Corolla Hatchback [03/2019

In this troubleshooting procedure Input/Turbine Speed Sensor may be used in place of Input Speed Sensor (transmission revolution sensor).

The transmission revolution sensor system uses a gear attached to the input shaft and a Hall IC type sensor.

The Hall IC built into the transmission revolution sensor detects the change in magnetic flux density caused by the rotation of the input shaft gear and outputs a voltage signal representing the input shaft speed to the ECM.

Reference: Inspection using an oscilloscope.

HINT:

The correct waveform is as shown.

ECM Terminal Name	Between NIMO and E1
Tester Range	1 V/DIV., 2 ms./DIV.
Condition	Engine idling and clutch pedal fully released

MONITOR DESCRIPTION

When the ignition switch to ON and the transmission revolution sensor output voltage is less than 0.2 V or more than 1.8 V for 5 seconds or more, the ECM stores a DTC and illuminates the MIL.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

P07C0: Input speed sensor range check(High voltage)

P07BF: Input speed sensor range check(Low voltage)

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON [A].
Turn the Techstream on.
Wait 10 seconds or more [B].
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P071512 or P071514.

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

HINT:

If the judgment result is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system is malfunctioning.
[A] to [C]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Read Freeze Frame Data using the Techstream. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

(d) Enter the following menus: Powertrain / Engine / Data List / Engine Speed and NIM Sensor Speed.

Powertrain > Engine > Data List

(f) With the shift lever in neutral and the clutch pedal released, idle the engine and read the tester display.

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.