DTC P0318
Diagnostic Instructions
DTC Descriptor
DTC P0318 00: Rough Road Sensor Circuit
Circuit/System Description
Correct engine misfire detection is dependent on whether or not the vehicle is experiencing a rough road condition. A rough road condition causes unexpected crankshaft fluctuations. In order to detect a rough road condition, the electronic brake control module (EBCM) communicates a wheel speed signal over the serial data circuit to the engine control module (ECM). The wheel speed sensor information allows the ECM to distinguish if the crankshaft speed variations are caused by a rough road condition or are caused by a true misfire. If the EBCM reports a wheel speed sensor failure, or the ECM does not receive the rough road information, this DTC sets.
Conditions for Running the DTC
| • | The ignition is ON or the engine is operating. |
| • | DTC P0318 00 runs continuously once the above conditions are met. |
Conditions for Setting the DTC
| • | The EBCM reports an affected wheel speed sensor to the ECM. |
| • | The ECM does not receive communication of a rough road signal from the EBCM for greater than 5 s. |
Action Taken When the DTC Sets
DTC P0318 00 is a Type B DTC.
Conditions for Clearing the DTC
DTC P0318 00 is a Type B DTC.
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
Circuit/System Testing
- Verify that no DTCs except P0318 00 are present.
- Verify the DTC does not reset. If the DTC resets, replace the K20 Engine Control Module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming
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