P0716

Circuit Description
The Automatic Transmission Input Speed Sensor (A/T ISS) is a permanent magnet with a coil of wire wound around it. The A/T ISS mounts in the transmission case facing the drive sprocket of the input shaft. As the drive sprocket 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.

An air gap of 0.08-2.12 mm (0.0032-0.834 in) must be maintained between the sensor and the drive sprocket to insure proper operation of the A/T ISS. The A/T ISS is used by the PCM 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 values, indicating poor performance of the system.
If the PCM detects an unrealistically large change in data from the A/T Input Speed Sensor, in a short period of time, then DTC P0716 sets. DTC P0716 is a Type B DTC.

Conditions for Setting the DTC
^ No TP DTCs P0121, P0122 or P0123 are set.
^ No Vehicle Speed Sensor (VSS) DTCs P0502 or P0503 are set.
^ No A/T ISS DTC P0717 is set and DTC P0717 has passed this ignition cycle.
^ No 1-2 shift solenoid valve performance DTC P0751 is set.
^ No 1-2 shift solenoid valve electrical DTC P0753 is set.
^ No 2-3 shift solenoid valve performance DTC P0756 is set.
^ No 2-3 shift solenoid valve electrical DTC P0758 is set.
^ The vehicle speed is greater than 8 km/h (5 mph).
^ The throttle angle is greater than 14%.
^ The engine speed is greater than 500 RPM for 5 seconds, and not in fuel shut off.
^ The input speed changes by greater than 1300 RPM in 0.8 seconds.

Action Taken When the DTC Sets
^ The PCM illuminates the Malfunction Indicator Lamp (MIL).
^ The PCM disables shift adapts.

Conditions for Clearing the MIL/DTC
^ The PCM turns OFF the MIL after three consecutive trips without a failure reported.
^ A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.
^ The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.

Diagnostic Aids
^ Check for Electromagnetic Interference (EMI) in circuits 1230 and 1231. EMI may be induced if the harness is routed along the spark plug wires.
^ Inspect the wiring at the PCM, the transmission 20-way connector, the ISS 2-way connector and all other circuit connecting points for the following conditions:
- A bent terminal
- A backed out terminal
- A damaged terminal
- Poor terminal tension
- A chafed wire
- A broken wire inside the insulation
- Moisture intrusion
- Corrosion
^ When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies that the PCM receives a signal from the Automatic Transmission Input Speed Sensor (A/T ISS).
3. This step verifies that there are no opens in the circuitry from the A/T ISS to the PCM.
4. This step verifies that there are no opens in the circuitry from the A/T ISS to the transmission 20-way connector.
6. This step performs a resistance check on the A/T ISS and the automatic transmission wiring harness.