Engine Control Modules (VIDEO)
Accurate diagnosis of any suspected ECM-related fault is important. This video is sponsored by The Group Training Academy.
ECM/PCM Communication Issues (VIDEO)
Before you swap out a module that won’t communicate, do a few simple inspections. Sponsored by The Group Training Academy.
CAN Bus Communications
There are three types of bus configurations that you will come in contact with — loop, star and a hybrid of both.
Tech IQ: Getting Rid of Code P0315 (VIDEO)
The code might set again when the engine is cranked. This video is sponsored by Auto Value and Bumper to Bumper.
ECM And PCM Calibration Numbers
Finding out if the vehicle has the latest version or calibration on a module is a required step.
How To Efficiently Diagnose Subaru DTC P0171
Improperly diagnosing a trouble code can cost time and efficiency. A good start will give a good finish.
Computer-Controlled, ‘Smart’ Charging System Strategies: Why Volts Are Smart, But Amps Are Smarter
When diagnosing a charging system on any modern import, think “smart.” I learned this lesson several decades ago when repairing a cranking, no-start condition on a 1989 Honda Civic, which was equipped with one of the first “smart” charging systems. After verifying fuse continuity, I discovered that excessively high charging voltage had destroyed the Honda’s Engine Control Module (ECM).
Volkswagen Tech Tip: DTC P0145 Software Update
DTC P0145 (Oxygen Sensor Circuit Bank 1-Sensor 3 Slow Response) is stored in the ECM. No other fault codes are present. The monitoring strategy that occurs between the rich-lean phases is too slow.
Gary Goms covers the basics of diagnosing a common cranking, no-start problem, be it on the venerable 280Z, or the latest generation of electronic fuel-injection sports cars. Understanding how to use wiring schematics and the full capabilities of a modern digital volt-ohm meter are essential first steps to snuffing out ECU issues.
Import Automatic Transmission Diagnostics
Don’t be alarmed if you pull an automatic transmission trouble code when diagnosing a “check engine” warning light! Since the automatic transmission operation has a major effect on grams-per-mile exhaust emissions, you’re going to see the occasional “global” P0700 to P0900-series diagnostic trouble codes (DTCs). The fact is, if you understand basic transmission operating principles,
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,
Audi: Vibrates at Idle
Complaint The customer says that the check engine light is on and that the vehicle vibrates at idle. Cause The customer’s complaint is confirmed, with the vehicle vibrating at idle, but the vibration was not felt at high speeds. A scan tool found code P1573 – Left Engine Mount Solenoid Valve (N144) Open Circuit (17981).