When Over-Voltages Electrocute PCMs
During the past nine months, I’ve had three instances of powertrain control module (PCM) failures on Jeep Wrangler vehicles that were evidently caused by an over-voltage condition.
Modern Charging Systems – Cover All The Bases During The Diagnostic Process
To quote a familiar situation: “My customer’s car is now on its third alternator in six months and my jobber store refuses to warranty a fourth.” In other words, the parts supplier believes that an underlying problem is causing these alternators to fail and, therefore, won’t warranty more alternators. While we occasionally experience a sequence
13 Alternator And Battery Testing And Diagnostic Tips
If only battery voltage is present at the battery on a running engine, does this mean the alternator is “bad?” No, it does not. That only means that the alternator is not charging, but does not reveal why. Therefore, it does not prove a faulty alternator.
Chrysler Transmission: The Case Of The Shiftless 48RE
The truck originally came into the shop with a broken band, which is a common and very cut-and-dried failure on a high-mileage 48RE transmission. The band and other friction lining was replaced and the valve body was cleaned. And, since the 3500 SLT had 240,000 miles on the odometer, the failure-prone electronic governor was replaced as well. Unfortunately, after the rebuilt transmission was installed and road-tested, the 48RE failed to shift out of first gear.
AGM Batteries And Testing
Two of the greatest changes we’ve seen in starting/charging systems during the past few model years have been the expanded use of the Absorbed Glass Mat (AGM) battery as standard equipment and the accelerating pricing structures of both AGM and conventional flooded-cell batteries.
Coil-On-Plug Diagnostics: Toyota Tundra
Sometimes simple = complex. For example, the modern coil-on-plug (COP) ignition system is perhaps among the simplest to diagnose, but to illustrate the complexities, let’s look at how a 2008 Toyota Tundra 4.0L V6 might record various misfire codes.
Top 10 Mercedes-Benz Repair Tips
With new vehicle sales topping 17.8 million units, and import nameplate VIO also on the rise, you’ll be seeing more imports that are in need of repair. And, with the increasing complexity and interconnectivity of vehicle systems, diagnostic expertise becomes all the more important. With that said, we bring you this collection of Mercedes-Benz repair tips to aid your service efforts.
The Best Tests For Fuel Delivery Systems
In this article, I’ll explain how the basics of testing fuel delivery problems has changed and how some of the most common mistakes in diagnosing fuel delivery systems can be avoided.
What To Do With Used Hybrid Batteries
The nickel metal hydride (NiMH) battery is the best and most common hybrid battery so far, and the sheer volume of them is staggering. NiHM batteries have been in use for well over 15 years, and out of the more than 7 million hybrid cars on the road worldwide, 90% have NiMH battery packs.
Intermittent Engine Misfire Analysis
Even for an experienced diagnostic technician, attempting to diagnose an intermittent misfire condition that occurs only under specific driving conditions can be a frustrating exercise. Let’s begin by getting the basics out of the way. As we know, the general causes of a misfire fall under the general headings of 1.) ignition, 2.) fuel density, 3.) compression and 4.) timing failures.
