PCM Archives - AutoSuccessOnline
Serial Data Buses: Diagnosing Networks

Serial data buses may seem like a daunting concept, but understanding them is now a required skill for techs.

Alternator Testing Tips — One Test Is Not Enough

All too often, the alternator is condemned by technicians due to a battery voltage test alone. However, there are many circumstances to consider before dooming the part to the recycling bin.

Diagnosing Crankshaft and Camshaft Signals

It’s more important than ever to understand how the crankshaft and camshaft sensors function in both the ignition control and fuel injection systems.

What Are the O2 Sensors Telling the PCM?

The catalyst efficiency monitor verifies that the catalytic converter is operating at a high enough efficiency rating to keep exhaust emissions within the predetermined values. The PCM compares the signals from the upstream and downstream oxygen sensors to determine the state of the converter.