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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Engine Control System Self-Diagnostics - 3.4L) >> Diagnostic Tests >> DTC P1380: EBTCM DTC Detected Rough Road Data Unusable >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, 2002 Chevrolet Monte Carlo, and 2002 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

The Powertrain Control Module (PCM) receives rough road information from the Electronic Brake Control Mode/Electronic Brake Traction Control Module (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 the EBCM/EBTCM to properly identify rough road situations while a misfire condition is being detected by the PCM, DTC P1380 will be set.

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