4T65-E Automatic Transaxle
DTC P0716
Circuit Description
The automatic transmission input speed sensor (ISS) is a permanent magnet with a coil of wire wound around it. The ISS mounts in the case cover facing the reluctor wheel of the input shaft. As the reluctor wheel is driven by the turbine shaft, an AC signal is induced in the input speed sensor. Higher vehicle speeds induce a higher frequency and voltage at the sensor.
There is a fixed air gap between the sensor and the teeth on the sensor reluctor wheel. The ISS input is used by the transmission control module (TCM) in order to control line pressure, torque converter clutch (TCC) apply and release and transmission shift patterns. This sensor is also used to calculate the appropriate gear ratios and TCC slippage.
This diagnostic indicates stuck, erratic, or intermittent conditions in the system.
If the TCM detects an unrealistically large change in the ISS high signal in a short period of time, then DTC P0716 sets. DTC P0716 is a type B DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0716 Input Speed Sensor Performance
Conditions for Running the DTC
^ No TP sensor DTC P0120 or P0220.
^ No ISS DTC P0717.
^ No VSS DTC P0722 or P0723.
^ DTC P0717 has passed this ignition cycle.
^ No 1-2 shift solenoid valve DTC P0752, P0973 or P0974.
^ The engine speed is greater than 500 RPM for 5 seconds.
^ The ISS is greater than 1050 RPM for at least 2 seconds.
^ An increase in ISS is 500 RPM or less for at least 2 seconds.
^ The vehicle speed is 16 km/h (10 mph) or greater.
^ The calc. throttle position is 8 percent or more.
^ The engine torque is greater than 50 Nm (37 ft. lbs.).
Conditions for Setting the DTC
The input shaft speed changes by 1,000 RPM or more for 3.25 seconds.
Action Taken When the DTC Sets
^ The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
^ The TCM commands maximum line pressure.
^ The TCM freezes transmission adaptive functions.
^ The TCM calculates input speed based on engine speed and gear ratio.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Freeze Frame and Failure Records.
^ The TCM stores DTC P0716 in TCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.
Conditions for Clearing the MIL/DTC
^ The ECM turns OFF the MIL during the third consecutive trip in which the TCM does not send an MIL illumination request.
^ A scan tool can clear the MIL/DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.
Diagnostic Aids
Ensure the wiring harness is not stretched too tightly or other components are pressing on the A/T inline 20-way connector body. Also inspect for proper clearance to any other components and wiring. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. A Yes answer indicates that the transmission side of the circuit is functioning properly.
4. Although the resistance is within specification in Step 3, there may be a short to ground or a short to voltage condition.
8. This step begins the transmission harness diagnosis.
