P0715 – Turbine shaft speed (TSS) sensor -circuit malfunction

John Kershaw

By John Kershaw (Contact Me)
Last Updated 2016-01-15
Ed.D, PhD Philosophy, BSME

Trouble CodeFault LocationProbable Cause
P0715 Turbine shaft speed (TSS) sensor -circuit malfunction Wiring, TSS sensor, ECM/PCM!TCM

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What Does Code P0715 Mean?

The automatic transmission TSS (Turbine Shaft Speed) or ISS (input shaft speed) sensor provides transmission input speed to the transmission control module(TCM). The ISS sensor can be a permanent magnet(PM) generator or a Hall-Effect switch (Creates an on–off square wave signal that is used directly by the PCM/TCM for speed detection). The TSS/ISS sensor mounts into the transmission case and maintains a slight air gap between the sensor and the forward clutch housing. T As the output shaft and internal gear rotate, the toothed rotor of the internal gear produces AC voltage as the rotor teeth pass through the magnetic field of the sensor of a digital signal if it is a Hall-Effect sensor. The AC voltage level or digital increases as the turbine shaft speed increases. The control module PCM or TCM converts the AC voltage of the PM generator into a digital signal. The TCM determines actual turbine speed using these signals and uses the input speed to calculate torque converter slip speed, and gear ratios.

Speed sensors measure the speeds of the input and output shafts or sometimes of other shaft speeds in the automatic transmission or transaxle. The output shaft speed sensor is often used to provide vehicle speed information to the control module and for adaptive learning. The output speed sensor (OSS) is also called the vehicle speed (VS) sensor and is used by the PCM for speedometer and cruise control operation as well as for transmission/transaxle operation and shift-related fault detection and if defective will set DTC related to cruise operation.

NOTE: Whenever diagnosing a 700 series DTC (Diagnostic Trouble Code) with a transmission, transfer case or other driveline components, check for a DTC under chassis and body systems, not just under “P” or powertrain/engine or emission control type codes. Module communications DTCs are “U” codes. These are most often found when looking for DTCs under chassis or body systems. Chassis related codes are labeled “C” and body system related codes are labeled “B” codes and these can cause drivetrain issues if they affect a sensor that is also used by the heating and air conditioning system.

715

Figure 1 TSS/ISS Circuit Wiring Diagram

DTC P0715 is detected when the control module TCM or ECM does not receive the right signal from the TSS/ISS sensor.

What are the common causes of code P0715 ?

  • Defective TSS/ISS Sensor
  • TSS/ISS Sensor harness damaged
  • TSS/ISS Sensor short-to-voltage
  • TSS/ISS Sensor short-to-ground
  • TSS/ISS Sensor circuit poor electrical connection

What are the symptoms of code P0715 ?

  • MIL (Malfunction Indicator Lamp [Check Engine & Service Engine Soon])lights on
  • Up and downshift concerns

Codes Related to P0715

BAT Team Discussions for P0715

  • P0715 Input/Turbine Speed Sensor Circuit Malfunction
    Hi I have a 1996 Ford Escort. The check engine light came on and it says P0715 Input/Turbine Speed Sensor Circuit Malfunction. Is this easy enough for me to fix? Also is it just removing the harness from the sensor and unscrewing it, and then putting the new one on? Or is it a lot more complicat...
  • P0715 Input/Turbine Speed Sensor Circuit Malfunction
    Hi I have a 1996 Ford Escort and the check engine light came on returing code P0715 Input/Turbine Speed Sensor Circuit Malfunction. Is this easy to get to on the transmission? Also is it easy enough for me to fix? Is it just unplugging the harness and unscrewing the senor and putting the new one ...
  • Mazda Protege 1997 1.5L Automatic Transmission Problem
    I have a 1997 Mazda Protege DX, Automatic Transmission 1. 5L engine, and am the original owner of the car. Recently it began having the problem I will describe, which seems to be transmission-related. When driving at moderate speeds (usually ~25 MPH) and maybe accelerating slightly, the car will...
  • TROUBLE CODES
    [I]Please fill out the following to ask a question.[/I] [B]MAKE[/B]:MITISHIBUSHI [B]MODEL[/B]:MONTERO SPORT 4WD [B]YEAR[/B]:2000 [B]MILES[/B]:165K [B]ENGINE[/B]:3.O L [B]DESCRIBE ISSUE[/B].I WAS DRIVING DOWN THE HIGHWAY NOTICED A SLIP IN THE TRANSMISSION THEN NOTICED THE AUTOTRANS LIGHT ON THE DAS...