P0717

DTC P0717 Input Speed Sensor Circuit No Signal (Gas)






Circuit Description

The Automatic Transmission Input Shaft Speed (A/T ISS) Sensor consists of a permanent magnet surrounded by a coil of wire. The rotation of the forward clutch housing induces an AC voltage in the circuit. The signal voltage and frequency vary directly with the forward clutch rotational speed.

When the Vehicle Control Module (VCM) detects a low or no input speed during high vehicle and high engine speeds, then DTC P0717 sets. DTC P0717 is a type D DTC. For California emissions vehicles, DTC P0717 is a type B DTC.

Conditions for Setting the DTC

1. No OSS DTC P0502.
2. No TFP Val. Position Sw. DTC P1810.
3. The vehicle speed is greater than 25 mph.
4. The engine runs greater than 475 RPM for at least 5 seconds and not in fuel cutoff.
5. The measured input speed is less than 50 RPM for at least 7 seconds.

Action Taken When the DTC Sets

- The VCM defaults the transmission to D2 pressure.
- The VCM freezes shift adapts.
- For California emissions only, the VCM illuminates the Malfunction Indicator Lamp (MIL).

Conditions for Clearing the DTC

1. For California Emissions, the VCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.
2. A scan tool can clear the DTC from the VCM history. The VCM clears the DTC from the VCM history if the vehicle completes 40 warm-up cycles without a failure reported.
3. The VCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the VCM.

Diagnostic Aids

- Inspect the wiring for poor electrical connections at the VCM. Inspect the wiring for poor electrical connections at the transmission 20-way connector. Look for the following problems:
- A bent terminal
- A backed out terminal
- A damaged terminal
- Poor terminal tension
- A chafed wire
- A broken wire inside the insulation
- The A/T ISS sensor harness being near the DIS components or the ignition wires.
- When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.
- First diagnose and clear any engine DTCs or TP Sensor codes that are present. Then inspect for any transmission DTCs that may have reset.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

2. This step tests for proper operation to the A/T ISS Sensor.
5. This step tests for proper A/T ISS circuit operation up to the VCM connections. Remove the fuel pump relay in order to eliminate a flooding condition during this step.