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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.

ECM And PCM Calibration Numbers

Finding out if the vehicle has the latest version or calibration on a module is a required step.

Nissan PCM Computer-Control Issues

The American writer Irene Peter said it best: “Just because everything is different doesn’t mean anything has changed.” By 2018, I thought everything had changed since the days of On-Board Diagnostics I (OBD I). Since OBD I evolved into OBD II in 1996, many things did indeed appear to be different. But, once in a great while, engineers design a vehicle that is slightly ahead of its time. For me, it was a 1995 Nissan pickup equipped with the 3.0-liter V6 engine and manual transmission. Surely being an oddity, it would start and run with the distributor disconnected.

Catalyst Efficiency Monitors: What Are The O2 Sensors Telling The PCM?

The catalyst efficiency monitor verifies that the catalytic converter is operating at a high enough efficiency rating to keep exhaust emissions within the predetermined values. The PCM compares the signals from the upstream and downstream oxygen sensors to determine the state of the converter. These “tests” are called readiness monitors.

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.

PCM And CAN Bus Communication Diagnosis

Although CAN bus was introduced by Mercedes-Benz during the early 1990s and adopted by many European manufacturers, many domestic and Asian auto manufacturers waited until the 2004 model year to introduce CAN bus in their lower-end, bread-and-butter vehicles.

Honda Civic: Failed PCMs And CAN System Diagnostics

This case study involving three failed PCMs in a 2002 Honda Civic illustrates the real-world complexities of diagnosing on-board modules linked together by a bus communications network.

PCM Diagnostics Case Study: No-Code Misfire Diagnosis On A 1998 Toyota 4Runner

When doing mobile diagnostic work for other shops, contributing writer Gary Goms usually sees more than his share of random no-code engine performance complaints. In the following case study, the customer of a client shop complained about an intermittent rough idle on his well-maintained 1998 Toyota 4Runner, but only when it was driven in hot weather. The client shop couldn’t duplicate the complaint, no matter how long the engine ran. Of course, the lack of DTCs didn’t help the diagnostic process.

Tech Feature: Dissecting The Control Module – PCMs, TCMs And BCMs

With the complexity of automotive electrical systems increasing steadily, manufacturers have developed troubleshooting trees and strategies to make it easier for technicians to diagnose problems. These steps and strategies are very helpful for technicians when followed, but they can also prevent them from using their cognitive skills.

Tech Tip: Hyundai Resetting PCM/TCM Adaptive Values

The PCM or TCM contains logic to adjust solenoid duty and line pressure as needed to compensate for normal clutch wear over the life of the transaxle. This bulletin provides the procedures necessary to reset (erase) and “relearn” the PCM/TCM adaptive values.