P1380

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 will not allow it to properly identify rough road situations while a misfire condition is being detected by the PCM, DTC P1380 will set.

CONDITIONS FOR RUNNING THE DTC
^ Engine load is less than 87 percent.
^ Engine speed is less than 5000 RPM.
^ Vehicle speed is more than 16 km/h (10 mph).
^ A Misfire DTC is occurring and requesting the Malfunction Indicator Lamp (MIL) to be illuminated.

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

ACTION TAKEN WHEN THE DTC SETS
^ The MIL does not turn ON.
^ A DTC is stored in memory under history DTC.
^ The Failure Records are stored.
^ The Failure Records are updated after the first failure of each ignition cycle.
^ Some type C DTCs may also cause an auxiliary service lamp to be illuminated, and/or display a message to the vehicle operator.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The history DTC will clear if the fault conditions have not been detected for 40 warm-up cycles.
^ A scan tool can be used to clear DTC information.

TEST

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