Refer to Diagnostic System Check - ABS in Engine Controls Schematics. .
Circuit Description
The PCM receives rough road information from the electronic brake control module or the electronic brake and traction control module (EBCM oe EBTCM) on the Class 2 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 or EBTCM transmits rough road information based on inputs from the wheel speed sensors. If the EBCM or EBTCM detects a condition that prevents proper identification of a rough road situation while a misfire condition is being detected by the PCM, DTC P1380 will 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 illumination of the malfunction indicator lamp (MIL) has been requested. |
Conditions for Setting the DTC
The PCM has detected a EBCM or EBTCM rough road sensing error.
Action Taken When the DTC Sets
| • | The PCM does not illuminate the Malfunction Indicator Lamp (MIL). |
| • | The PCM stores the conditions that were present when the DTC set as Fail Records data only. This information is not stored as Freeze Frame data. |
Conditions for Clearing the MIL/DTC
| • | A history DTC clears after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | DTC can be cleared by using the scan tool Clear Information function or by disconnecting the PCM battery feed. |
Diagnostic Aids
A DTC P1380 set indicates that the antilock brake system (ABS) or the traction control system (TCS) has detected a malfunction that will not allow the EBCM or EBTCM to transmit correct rough road data to the PCM. The ABS or TCS Functional Test in Diagnostic System Check - ABS in Antilock Brake System should be used to diagnose this condition.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Diagnostic System Check - ABS in ABS/TCS |
