DTC P0717 Input Speed Sensor Circuit No Signal 5.7L and 7.4L Gas
Circuit Description
The Transmission Input Shaft Speed 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 VCM detects a low 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
| • | No VSS DTC P0502. |
| • | No TFP Val. Position Sw. DTC P1810. |
| • | The vehicle speed is greater than 20 mph. |
| • | The engine runs greater than 5 seconds and not in fuel cutoff. |
| • | Do not put the transmission in Park or Neutral. |
| • | The measured input speed is less than 50 RPM for at least 2 seconds. |
Action Taken When the DTC Sets
| • | The VCM defaults the transmission to D2 line pressure. |
| • | The VCM freezes shift adapts. |
| • | For California emissions only, the VCM illuminates the Malfunction Indicator Lamp (MIL). |
Conditions for Clearing the DTC
| • | For California Emissions, the VCM turns OFF the MIL after three consecutive ignition cycles without a failure reported. |
| • | 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. |
| • | 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 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. |
| • | 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.
-
This step tests for proper operation to the Input Shaft Speed Sensor.
-
This step tests for proper circuit operation up to the VCM connections.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||||||||
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data. Is the voltage above the specified value? | 0.5 volts | |||||||||
3 | Inspect circuit 1231 for an open. Did you find a condition? | -- | ||||||||
4 | Inspect circuit 1230 for an open. Did you find a condition? | -- | ||||||||
Is the voltage above the specified value? | 0.5 volts | -- | ||||||||
6 | Repair the open in circuit 1231. Did you correct the condition? | -- | -- | |||||||
7 | Repair the open in circuit 1230. Did you correct the condition? | -- | -- | |||||||
8 | Replace the Input Shaft Speed Sensor. Refer to Automatic Transmission Input Shaft Speed Sensor Replacement, in On-Vehicle Service. Is the replacement complete? | -- | -- | |||||||
9 | Replace the VCM. Refer to VCM Replacement/Programming , Section 6. Is the replacement complete? | -- | -- | |||||||
10 | In order to verify your repair, perform the following procedure:
Has the test run and passed? | -- | System OK |
