Refer to Engine Controls Schematics
Class 2 Data Lines
.
Circuit Description
The powertrain control module (PCM) receives rough road information from the EBCM/EBTCM 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/EBTCM transmits rough road information based on inputs from the wheel speed sensors. If the EBCM/EBTCM 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 be 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/EBTCM rough road sensing error.
Action Taken When the DTC Sets
The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.
Conditions for Clearing the MIL/DTC
| • | The DTC becomes history when the conditions for setting the DTC are no longer present. |
| • | The history DTC clears after 40 malfunction free warm-up cycles. |
| • | The PCM receives a clear code command from the scan tool. |
Diagnostic Aids
DTC P1380 set indicates that the ABS has detected a malfunction which will not allow the EBTCM to transmit correct rough road data to the PCM. The Diagnostic System Check - ABS in Antilock Brake System should be used to diagnose this condition.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On Board Diagnostic (OBD) System Check? | -- | Go to Diagnostic System Check - ABS in Antilock Brake System |
