Cart $0.00
Subtotal: $0.00
No products in the cart.



State-of-the-Art Computer Diagnostics

In the early days of onboard electronics, the 1980s, most vehicles had only one computer onboard: the engine control module (ECM). The ECM, which is still in use today, is a car’s primary computer. It uses a collection of sensors to monitor powertrain operations. Then, it applies that data to control various outputs (e.g., the fuel injectors and emissions equipment). When it detects a problem, it turns on the check engine light and stores a trouble code in its memory.

Computer Diagnostics: Much More Than Just a Check Engine Light

But the ECM is no longer the only onboard computer. Modern cars are equipped with dozens of control modules, each tasked with controlling a different system. There’s one for the HVAC system, one for the body – even one for each power window! To complicate things further, they communicate with one another over a data bus.

Needless to say, special equipment – as well as a great deal of knowledge – is needed to diagnose and repair these vast electronic networks. Although each module is designed to store a code when it detects a problem, this information isn’t an actual diagnosis. It merely serves as a starting place for further analysis. Hours of tedious troubleshooting may be needed to determine the actual problem.

These days, electronic components such as computers, sensors, and actuators are integrated with traditional mechanical parts. There’s no way to separate the two completely. Because of this, nearly any type of problem – from a harsh shifting transmission to a broken HVAC system – can be caused by onboard electronics. Depending on the failure, these units may or may not turn on a warning light (ABS, EPS, etc.). A diagnostic code is usually stored, but not always.

Visit the experts at Crompton Brothers

If your check engine light is on – or you’ve some other problem with your car’s onboard electronic controls – stop by Crompton Brothers. We have all the latest equipment, as well as years of combined knowledge, needed to tackle these high-tech problems.



MON - FRI 8:00 AM - 5:00 PM
Saturday CLOSED


Crompton Brothers Automotive
7797 Edmonds St,
Burnaby, BC V3N 1B9


Amazing customer service!!! Fair prices and timely completion of Work.

We honour and do work for the following warranty companies: