P0717

CIRCUIT DESCRIPTION

The Automatic Transmission Input (Shaft) Speed (A/T ISS) sensor is a permanent magnet with a coil of wire wound around it. The A/T ISS sensor mounts in the transmission case facing the drive sprocket of the input shaft. An air gap of 0.045-0.109 in. between the sensor and the drive sprocket must be maintained so that an accurate AC voltage can be transmitted. Sensor voltage varies from 0.5 volts AC at 100 RPM to more than 100 volts at 8000 RPM. The A/T ISS sensor has a resistance value of 1300-1950 ohms.

When the Powertrain Control Module (PCM) detects a low input speed while the vehicle and engine speeds are high, then DTC P0717 sets. DTC P0717 is a Type B DTC.

CONDITIONS FOR SETTING THE DTC

^ No Throttle Position (TP) sensor DTCs P0121, P0122 or P0123 are set.
^ No Vehicle Speed (VSS) sensor DTCs P0502 or P0503 are set.
^ No Automatic Transmission Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) DTC P1810 is set.
^ The engine is not in fuel cut off.
^ The engine is running for more than 5 seconds.
^ The transmission is not in Park or Neutral.
^ The vehicle speed is greater than 16 km/h (10 mph).
^ The input(shaft) speed is less than 50 RPM for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS

^ The PCM illuminates the Malfunction Indicator Lamp (MIL) after two consecutive trips with a failure reported.
^ SERVICE ENGINE SOON, SERVICE TRANSMISSION displays on the Driver Information Center (DIC).
^ The PCM commands default line pressure.
^ The PCM inhibits Torque Converter Clutch.
^ The PCM inhibits torque management.
^ The PCM disables steady state adapts.
^ The PCM disables upshift adapts.
^ The PCM disables garage shift adapts.
^ The PCM inhibits garage shift pressure calculations.
^ The PCM calculates input(shaft) speed from vehicle speed and commanded gear.

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

^ Inspect the wiring for poor electrical connections at the PCM. Inspect the wiring for poor electrical connections at the transmission 20-way connector. Inspect the wiring for poor electrical connections at the A/T ISS sensor 2-way connector. Look for the following problems:

- A bent terminal
- A backed out terminal
- A damaged terminal
- Poor terminal tension
- A chafed wire

^ When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.
^ Inspect the transmission 20-way connector for transmission fluid.

TEST DESCRIPTION

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

2. This step verifies that the DTC is set, and that Input (Shaft) speed RPM is displayed on the scan tool.
3. This step inspects circuit 1230 and circuit 1231 for an AC voltage.
6. This step verifies that circuit 1231 is not open.
8. This step measures the resistance value of the Automatic Transmission Input (Shaft) Speed sensor and circuitry. The ohmmeter must display a value between 1300-1950 ohms.
13. This step tests for a resistance less than 100 ohms, indicating a possible short to ground in circuit 1230 or 1231.