Diagnostic Solutions: The Relationship Between PCMs, Sensors and Actuators
Not that I recommend installing used PCMs, but I occasionally need a rebuildable core to replace a missing or badly damaged powertrain control module (PCM). But lately, I’ve noticed that it’s becoming increasingly difficult to find a used PCM for an older import at a local auto salvage yard. While it’s sheer speculation on my part, this apparent shortage of PCM cores might be caused by too many poorly trained technicians replacing PCMs to solve sensor-based problems. In most of these cases, the problem remains unsolved even as the original and fully functional PCM is casually tossed into the trash when the tech moves on to another job.
Diagnostic Dilemmas: 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. The first case involved an owner who requested that a local shop replace the fuel pump because his 1998 Wrangler was slow-starting in the morning. The shop found the pump pressure was marginal and replaced the pump. Because the Jeep still had the problem, the owner complained about the fuel pump, first to the shop and then to the local jobber supplying the pump.
Tech Tip: The PCM Relies on Good Information from the Oxygen Sensors
Do you know your oxygen sensors? Oxygen sensors have been used for more than a quarter of a century, dating back to 1980 when the first computerized engine control systems appeared. The oxygen (O2) sensor is part of the fuel management system. It monitors unburned oxygen in the exhaust. The powertrain control module (PCM) uses this information to determine if the fuel mixture is rich (too much fuel) or lean (not enough fuel) ….
Flashing Signals / Reprogramming PCMs
You don’t have to be Microsoft A+ certified to flash reprogram automotive PCMs, but the process requires a certain amount of know-how as well as special tools and access to the latest OEM software upgrades (which are not free!). What’s more, it’s not a risk-free endeavor. Certain precautions must be undertaken before you begin, and
Tech Tip: PCMs – The World of Vehicle Computers
When a vehicle’s powertrain control module (PCM) starts acting up, almost anything can happen. The engine might not start, or if it does, it might not idle properly or run smoothly. PCM failures may involve one of the driver circuits for the fuel injectors or the ignition coils.
The PCM Effect on Oil Service
As with everything else under the automotive sun, technology is changing the lube, oil and filter market. More specifically, modern technology is making it possible to use the vehicle’s on-board engine management system to mathematically determine the length of an oil change interval. At the most basic level, the PCM simply adds up the mileage
Toyota Regenerative Braking System
The brake system of a hybrid may have multiple components to perform regenerative braking and pedal simulation.
MPA To Offer Free Part Smart Training in 2024
The sessions will cover brake training, vehicle-specific starter issues, advanced charging systems, DTCs and more.
Gasoline Direct Injection Technology
Gasoline Direct Injection technology has been a key part of improving fuel economy and reducing emissions since the early 2000s. This video is sponsored by Standard.
Understanding Emissions
Modern EVAP systems are selective with how they vent vapors back into the engine. Sponsored by Standard.
