P0317

DTC P0317 Rough Road Sensor Source Not Detected

Circuit Diagram:

System Description
The Engine Control Module (ECM) identifies engine misfire by detecting variations in crankshaft speed. Crankshaft speed variations can also occur when a vehicle is operating over a rough road. The ECM receives rough road signal by gravity sensing rough road (G) sensor or Electronic Brake Control Module (EBCM) if equipped with the Anti-Lock Brake System (ABS). The ABS can detect if the vehicle is on the rough surface based on wheel acceleration/deceleration data supplied by each wheel speed sensor. This information sent to the ECM by EBCM through serial data line. The G sensor is vertical low g-acceleration sensor. By sensing vertical acceleration caused by bumps or portholes in the road, the ECM determine if the changes in crankshaft speed are due to engine misfire or are driveline induced. If the ECM can not receive any of those signal, a historic Diagnostic Trouble Code (DTC) will be stored.

Conditions for Setting the DTC
- ECM can not detect any rough road source.
- Engine run time is greater than or equal to 10 seconds.

Action Taken When the DTC Sets
- The MIL will illuminate will not illuminate.
- The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffers.
- A history DTC is stored.

Conditions for Clearing the MIL/DTC
- A history DTC will clear after 40 consecutive warm-up cycles without a fault.
- The DTC(s) can be cleared by using the scan tool.
- Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids
An open signal circuit of G sensor or open serial data line between the ECM and the EBCM will be the cause of this DTC.

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