P1380

DTC P1380

Diagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure. Diagnostic System Check - Vehicle Diagnostic Information
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information

DTC Descriptor
DTC P1380 Misfire Detected - Rough Road Data Not Available

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.

Conditions for Running the DTC
^ The engine is operating.
^ DTC P1380 runs continuously once the above conditions are met for more than 5 seconds.

Conditions for Setting the DTC
^ The ECM detects an engine misfire while the rough road signal is unavailable.
^ The condition exists for more than 4 seconds or a cumulative of 50 seconds.

Action Taken When the DTC Sets
DTC P1380 is a Type C DTCs.

Conditions for Clearing the DTC
DTC P1380 is a Type C DTCs.

Circuit/System Testing
Start and idle the engine, observe the DTC information with a scan tool.

NOTE: If any UXXXX DTCs are set, diagnose those first.

^ If DTC P1380 failed this ignition, refer to [Diagnostic Starting Point - Antilock Brake System]. Initial Inspection and Diagnostic Overview

Repair Instructions
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information] after completing the diagnostic procedure. Diagnostic Repair Verification - Vehicle Diagnostic Information