P1380

Diagnostic Chart:

Refer to Engine Controls Schematics. Electrical Diagrams

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) receives rough road information from the Electronic Brake Control Module (EBCM) on the serial data circuit. The PCM uses the rough road information to enhance the misfire diagnostic by distinguishing crankshaft speed variations caused by driving on rough road surfaces from variations caused by true misfires. The EBCM transmits rough road information based on inputs from the wheel speed sensors. If the EBCM detects a condition which does not allow the EBCM to properly identify rough road situations while a misfire condition is being detected by the PCM, DTC P1380 is set.

CONDITIONS FOR RUNNING THE DTC
- The engine load is less than 87 percent.
- The engine speed is less than 5000 RPM.
- The vehicle speed is more than 10 mph.
- A misfire DTC is occurring and requesting that the Malfunction Indicator Lamp (MIL) be illuminated.

CONDITIONS FOR SETTING THE DTC
The PCM has detected a EBCM rough road sensing error.

ACTION TAKEN WHEN THE DTC SETS
- The PCM will not illuminate the malfunction indicator lamp (MIL).
- The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data.

CONDITIONS FOR CLEARING THE MIL/DTC
- A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
- The DTC can be cleared by using a scan tool.