P0716

DTC P0716 (Diesel)












Circuit Description with 4L80-E / 4L85-E Automatic Transmission
The Automatic Transmission Input Shaft Speed (AT ISS) sensor provides transmission input speed to the Powertrain Control Module (PCM). The AT ISS sensor is a Permanent Magnet (PM) generator. The sensor mounts into the transmission case and maintains a slight air gap between the sensor and the forward clutch housing. The PM generator produces an AC voltage as the forward clutch housing 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 unrealistically large change in input speed, then DTC P0716 sets. DTC P0716 is a type B DTC.

Conditions for Running the DTC
^ No AT ISS sensor DTC P0717.
^ No AT OSS sensor DTCs P0722 or P0723.
^ No shift solenoid DTCs P0751 or P0753.
^ System voltage is 8-18 volts.
^ Engine speed is greater than 475 RPM for greater than 7 seconds.
^ The APP angle is greater than 15 percent.
^ Transmission fluid pressure manual valve position switch is not indicating PARK or NEUTRAL.
^ The vehicle speed is greater than 32 km/h (20 mph).

Conditions for Setting the DTC
The AT ISS varies by more than 1,200 RPM within 4 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 shift adapts.
^ 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 the 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
^ For Federal and California emissions, 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.
^ For Federal and California emissions, the PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring.
^ For vehicles equal to or greater than 15,000 lbs GVW, the PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring.
^ The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM.

Diagnostic Aids
^ You may have to drive the vehicle in order to experience a fault.
^ DTC P0716 defaults to an elevated line pressure condition which may result in TCC partial apply. This may induce idle surge and engine stall.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. This step tests for proper operation of the AT ISS sensor.
8. This step tests for proper AT ISS sensor circuit operation up to the PCM connections. You remove the fuel solenoid fuse in order to eliminate a flooding condition during this step.
10. This step tests for a short to ground in the AT ISS sensor circuit.