Following The ‘Electronic Trail’ As A Means To Solve PCM-Related Problems
Leave your wrenches in your toolbox because in this month’s Diagnostic Solutions, we’re going to explore how to diagnose many common powertrain control module (PCM)-related driveability and electrical problems by following what I call The Electronic Trail.
GM’s Autronic Eye (1952)
In 1952, GM introduced the Autronic-Eye headlight system that dimmed the high beams when an oncoming vehicle was detected, and then turned them back on when the opposing vehicle passed. The system used a light photosensor mounted in a vacuum tube. The system would then amplify the signal using a tube amplifier so a relay could turn the lights off or on.
AUDI: Start-Stop System Information
This informational TSB applies to Audi vehicles with a start/stop system. The start/stop system allows automatic engine stops and starts. Although the driver expects it, the engine may not automatically be switched off due to many different factors.
VIDEO: Stop-Start System Service Opportunities
Andrew Markel discusses service opportunities for vehicle stop-start systems and how several modules are involved in the activation of the feature. Sponsored by Bosch Automotive Service Solutions.
VIDEO: Alternators And AC Ripple
Andrew Markel explains how AC ripple can affect modules’ communication and even damage them. Sponsored by Bosch Automotive Service Solutions.
VIDEO: Ohm’s Law And Modern Sensors
Andrew Markel explains how Ohm’s law can be used to diagnose issues in several different electrical components in a vehicle. Sponsored by Bosch Automotive Service Solutions.
Common TIPM Customer Complaints
You name the electrical system, and chances are, it runs through the TIPM. But, the TIPM isn’t without its own faults, which is why I renamed it, “Trouble In Power Management.”
VIDEO: Battery Drain From Air Conditioning
In the hotter months, your shop may experience a boost in vehicles with dead batteries. Andrew Markel shows you how to prepare. Sponsored by Auto Value and Bumper to Bumper.
Oil And Direct Fuel Injection
The oil in the crankcase of a direct fuel injected engine can make a huge difference in the health of the engine. The right oil can reduce carbon deposits on the intake valves and keep the engine healthy.
VIDEO: Diagnosing A Washer Pump With A Scan Tool
Andrew Markel demonstrates how bidirectional controls on some scan tools can allow testing and diagnosis of the washer pump and several other components. Sponsored by MAHLE.
Alternator Failures: Low Voltage To The Battery
One reason why alternators have a high failure rate is because they’re always working under a load. Generating electricity to recharge the battery, run the fuel pump, injectors and ignition system while powering all of the vehicle’s lights and electrical accessories places a substantial load on the alternator that generates a lot of internal heat.
VIDEO: Choosing The Right Spark Plug Replacement
Andrew Markel shows the importance of choosing a spark plug replacement with the OE-recommended or better material. Sponsored by Robert Bosch.
