P0717

DIAGNOSTIC TROUBLE CODE (DTC) P0717 INPUT SPEED SENSOR CIRCUIT NO SIGNAL





Circuit Description
Transmission input speed is provided to the Powertrain Control Module (PCM) by the Automatic Transmission Input (Shaft) Speed Sensor (A/T ISS), which is a 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 in front of the sensor's magnetic field. The AC voltage level increases as the speed of the turbine shaft increases. The PCM then converts the AC voltage into a digital signal. This digital signal is then used by the PCM to determine actual turbine speed. The PCM uses input speed to calculate torque converter slip speed and gear ratios.
When the PCM detects a low input speed when the vehicle has a large output speed, then Diagnostic Trouble Code (DTC) P0717 sets.

Conditions For Setting The DTC
- PCM illuminates the Malfunction Indicator Lamp (MIL) after two consecutive tries with a failure reported.
- No Automatic Transmission Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) DTC P1810.
- No Vehicle Speed Sensor (VSS) DTCs P0722 or P0723.
- Engine running.
- TFP Val. Position Sw. is indicating transmission is not in Park or Neutral.
- Turbine input speed is less than 100 rpm for five seconds.
- Vehicle speed is greater than 8 km/h (5 mph).

Action Taken When The DTC Sets
- DTC P0717 will be stored in PCM memory.
- PCM commands maximum line pressure.
- PCM inhibits Torque Converter Clutch (TCC) engagement.
- Freeze shift adapts from being updated.

Conditions For Clearing The DTC
- PCM turns off the MIL after three consecutive ignition cycles without a failure reported.
- When turbine speed is greater than 120 rpm for three seconds for three consecutive ignition cycles.
- History DTCs can be cleared by using a Scan Tool.

Diagnostic Aids
- This diagnostic test checks for an Input Speed Sensor (ISS) circuit problem. If the engine is running and the vehicle is moving above a certain speed, then the input speed must be non-zero.
- Inspect the wiring for poor electrical connections at the PCM and at the transmission 20-way connector. Look for possible bent, backed out, deformed or damaged terminals. Check for weak terminal tension as well. Also check for chafed wires that could short to bare metal or other wiring. Inspect for broken wire inside the insulation.
- If diagnosing for a possible intermittent short or open condition, move or massage the wiring harness while observing test equipment for a change.

Test Description
The numbers below refer to the step numbers on the diagnostic chart.
3. This test checks the speed sensor for correct resistance.
7. This test verifies the wiring from the transmission 20-way connector to the PCM, and tests the ability of the A/T ISS to produce an AC current.








DTC P0717 - Input Speed Sensor Circuit No Signal