P0716

DTC P0716

Schematic:

Circuit Description
The Automatic Transmission Input, Shaft, Speed Sensor (AT ISS) provides transmission input speed to the PCM. The AT ISS is a permanent magnet generator. The sensor mounts into the transmission case and maintains a slight air gap between the sensor and the drive sprocket. The AT ISS produces an AC voltage as the drive sprocket rotor teeth pass through the sensor's magnetic field. The AC voltage level increases as the turbine shaft speed increases. The PCM converts the AC voltage into a digital signal. The PCM determines actual turbine speed using the digital signal. The PCM uses the input speed to calculate torque converter slip speed, and gear ratios.
When the PCM detects an unreasonably large change in the input speed, in a very short period of time, then DTC P0716 sets. DTC P0716 is a type B DTC.

Conditions for Running the DTC
- No TP DTCs P0121, P0122, or P0123.
- No VSS DTCs P0502 or P0503.
- No AT ISS DTC P0717.
- No 1-2 SS valve DTCs P0751 or P0753.
- No 2-3 SS valve DTC P0758.
- The engine is running.
- The TP angle is greater than 15 percent.
- The vehicle speed is greater than 8 km/h (5 mph).

Conditions for Setting the DTC
The input speed changes by greater than 1,300 RPM in 0.8 seconds.

Action Taken When the DTC Sets
- The PCM illuminates the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
- The PCM commands maximum line pressure.
- The PCM freezes transmission adapt functions.
- The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.
- The PCM stores DTC P0716 in PCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.

Conditions for Clearing the MIL/DTC
- The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.
- A scan tool can clear the MIL/DTC.
- The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
- The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the PCM.

Test Description

Steps 1-6:

Steps 7-14:

The numbers below refer to the step numbers on the diagnostic table.
3. This step tests the AT ISS for correct resistance.
8. This step tests the AT ISS high signal circuit for being shorted to another circuit within the transmission.