P0717

Diagnostic Chart:

Wiring Diagram:

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 Powertrain Control Module (PCM) detects a low or no input speed during high vehicle and high engine speeds, then DTC P0717 sets. DTC P0717 is a type B DTC.

CONDITIONS FOR SETTING THE DTC
1. No Output Speed Shaft (OSS) Sensor DTCs P0722 or P0723.
2. No TFP Val. Position Sw. DTC P1810.
3. The vehicle speed is greater than 20 mph.
4. The engine runs greater than 475 RPM 7 seconds.
5. The A/T ISS is less than 50 RPM for at least 5 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM defaults the transmission to maximum line pressure.
^ The PCM freezes shift adapts.
^ The PCM illuminates the Malfunction Indicator Lamp (MIL).

CONDITIONS FOR CLEARING THE DTC
1. The PCM turns OFF the ML after three consecutive ignition cycles without a failure reported.
2. 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.
3. 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
^ Inspect the wiring for poor electrical connections at the PCM 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.
^ 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 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 of the A/T ISS Sensor.
5. This step tests for proper A/T ISS Sensor and circuit operation. Remove the Fuel Sol. fuse in order to eliminate a flooding condition during this step.