P0717

P0717 WITH 4 SPEED AUTOMATIC

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The Automatic Transmission Input (Shaft) Speed Sensor (A/T ISS) provides transmission input speed to the Powertrain Control Module (PCM). The A/T ISS is Permanent Magnet (PM) generator. The sensor mounts into the transmission case and maintains a slight air gap between the sensor and the drive sprocket. The PM generator produces an AC voltage as the drive sprocket 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 a low input speed and the vehicle has a large vehicle speed, then DTC P0717 sets. DTC P0717 is a type A DTC.

CONDITIONS FOR SETTING THE DTC

^ No TFP Val. Position Sw. DTC P1810

^ No Vehicle Speed Sensor (VSS) DTC P0502

^ The engine is running.

^ The TFP Val. Position Sw. indicates the vehicle is not in Park or Neutral.

^ The vehicle speed is greater than 12 km/h (7 mph).

^ The input speed is less than 100 RPM for 5 seconds.

ACTION TAKEN WHEN THE DTC SETS

^ The PCM illuminates the Malfunction Indicator Lamp (MIL).

^ DTC P0717 is stored in the PCM history.

^ The PCM inhibits TCC engagement.

^ The PCM freezes shift adapts from being updated.

^ The PCM commands maximum line pressure.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The PCM turns OFF the MIL after three consecutive ignition cycles 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

^ If the engine is running and the vehicle is moving above 12 km/h (7 mph), then the input speed must be non-zero.

^ 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 conditions:

- 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 condition, 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.

3. This Step tests the A/T ISS Sensor for correct resistance.

7. This Step verifies the wiring from the transmission 20-way connector to the PCM, and tests the ability of the A/T ISS Sensor to produce an AC current.