Refer to Antilock Brake System in Electrical Diagnosis.
The PCM receives rough road information from the EBCM / 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 / 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.
The PCM has detected a EBCM / EBTCM rough road sensing error.
• | The PCM will not illuminate the Malfunction Indicator Lamp (MIL). |
• | The PCM will store conditions which were present when the DTC set as Fail Records data only. This information will not be stored as Freeze Frame data. |
• | A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
• | DTC can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed. |
DTC P1380 set indicates that the ABS / TCS system has detected a malfunction which will not allow the EBCM / EBTCM to transmit correct rough road data to the PCM. The ABS/TCS Functional Test in ABS/TCS section 5E2 should be used to diagnose this condition.
Step | Action | Value(s) | Yes | No |
---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to the ABS/TCS Functional Test in ABS/TCS Section 5E2 |