November 2022

Particulate Matter  Filter Monitor — PM Monitor Used only on diesel engine the particulate matter (PM) filter removes particulate matter from the exhaust stream by filtration. The filter has a honeycomb structure similar to a catalyst substrate, but with the channels blocked at alternate ends. This forces the exhaust gas to flow through the walls between the channels, filtering the particulate matter out. The filters are self-cleaning by periodic modification of the exhaust gas concentration in order to burn off the trapped particles (oxidizing the particles to form CO2 and … Read More
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Comprehensive Component Monitor —CCM I/M Monitor The CCM continuously checks all inputs and outputs from all the sensors, actuators, switches and other devices that provide a signal to the computer. The comprehensive component monitor is always looking for a short, open, out of range value, functionality and “rationality.” What is rationality in a monitor? The simple answer is this; the computer is checking to see if the sensor’s value makes sense. The computer compares all other inputs and against information in the computer’s memory to see if the values are … Read More
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Misfire Monitor — Readiness Monitor for Misfires In short, the I/M Readiness Misfire Monitor is a continuous monitor that is always checking for r engine misfires. How misfires are detected The misfire monitor detects misfires in two ways. In vehicles equipped with smart ignition coils, the COP coil itself reports a misfire to the ECM. In other vehicles, the misfire monitor tracks the crankshaft position sensor to detect a slowdown in crankshaft rotation that indicates a cylinder didn’t fire or “contribute” power. Engine RPM isn’t constant; instead it’s a series … Read More
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Fuel System Monitor — How it works The Fuel System Monitor is actually more of a Fuel System Correction program. The ECM is constantly monitoring how well it did in calculating fuel-to-air ratios. When it must make an adjustment from factory programming; either by adding fuel or subtracting fuel, it enters those corrections into either short term fuel corrections or long term fuel corrections. Those corrections are referred to as Fuel Trim What is Fuel Trim? Fuel Trim is a set of positive and negative adjustments to factory air/fuel programming … Read More
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Oxygen Sensor Monitor In simple terms, the Oxygen Sensor’s only job is to monitor how much oxygen is in the vehicle’s exhaust stream. The ECM uses this information to determine how good of a job it did in calculating the air/fuel ratio based on the current driving conditions (outside air temperature, engine temperature, accelerator pedal position, air mass, etc.). Based on the results, the ECM makes changes to future air/fuel calculations. How oxygen sensors work Carmakers use various types of oxygen sensors, with the most recent designs called air/fuel ratio … Read More
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Oxygen Sensor Heater Monitor The Oxygen Sensor Heater Monitor’s job is to constantly monitor the operation of the oxygen sensor’s heater. There are two modes of operation on a computer-controlled vehicle: “open-loop” and “closed-loop.” The vehicle operates in open-loop when the engine is cold. During open loop, the ECM calculates fuel based on outside air temperature and engine coolant temperature sensor readings only, ignoring data from the oxygen sensors. However, once the oxygen sensors’ heaters bring the sensor up to 600°F operating temperature, the ECM switches to closed loop operation … Read More
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The Mechanic Doctor – Resources for Amateur and Pro Auto Mechanics
At some point, you’re going to sell your car. I have a lot of experience selling vehicles, and I know
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The Mechanic Doctor – Resources for Amateur and Pro Auto Mechanics
Maintaining a vehicle correctly is critical to keep it running for a long time while looking great. The way you
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The Mechanic Doctor – Resources for Amateur and Pro Auto Mechanics
Due to some health issues and to save money people are converting their travel from cars to bikes. Now simple
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