Advanced Diagnostics

Advanced Diagnostics - DTC P0715: Input Shaft (Mainshaft) Speed Sensor Circuit Malfunction (M/T Model)






General Description
The input shaft (mainshaft) speed sensor is attached to the transmission housing to sense input shaft (mainshaft) revolutions. The engine control module (ECM) determines the vehicle speed according to the signal from the input shaft (mainshaft) speed sensor for the control units. If no signal from the input shaft (mainshaft) speed sensor is received for a set time, the ECM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Engine speed must not be 1,000 rpm or more if the throttle position is 2.0 deg. or more.


Malfunction Threshold
No signal from the input shaft (mainshaft) speed sensor is detected for at least 20 seconds.

Driving Pattern
Start the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on.

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the ECM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.

Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.