How does a person diagnose obd II systems?

Answer 1

To diagnose any vehicle is a process of scientific tests with a hypothesis supported by the study of physics and chemistry. Diagnosis is a dynamic process the covers the whole process of a system, created by the phenomenal processes of energy that reacts.

Decay, Ware, and Tear are Reactions that are caused by reactions, friction, and change in energy. These are the general causes for repair, they have to be measured with the dynamic tools to show the humans a function result...This is known as an effect, humans, use to get work done. These states make systems caused mostly by nature...

Repairing is the force against nature... In automobiles , or a vehicle's system, it has Chemicals that react... These chemicals are know as elements and molecules each one moves and reacts according to the force of mass, electricity (which is the polarity of magnetism or Ionic power( which can vary in type), gamma radiation ( heat , light, atomic bonds, molecular bonds that all react with sub atomic particles with a new set of undiscovered phenomenal properties in part at the very sub atomic scale... We Can not see all of the the dynamica effects of the atom and energy with our eye, but other senses may...

When a reaction occurs energy moves and laws take place based on the exact measure of a mass , masses, and volumes... These are also geometrical effects that can change when a measure changes...

Now, Obd II systems use complex chemistry to create electrical systems, chemical/physical , and mechanical systems that measure a vehicles functions, when these measures change beyond the limits repair is necessary and nature was the culprit...

Decay is energy moved out of place or reactions caused by an imperfect function of energy...

Tools are a device , made from phenomenal engineers and scientists, governed by LAWS, using high level math and low level math so that those tools can do work to accomplish precise measurements... Safety is the most important part to govern and diagnose any thing...These measurements are known as specifications...One of the most important parts to data in measurement in the automotive world... Although measurements are precise, they also have tolerance values; these allow a system, or machine to work in a range and still provide a function... Now , you know that measurement and science has laws, like volume , mass, dynamic functions and effects, you then need to study math and automotive science, physics, chemistry, electricity, device and machine technology... You are a scientist when you conquer the dimensional, analytical, and physical/chemical automotive system reactions...

OBD II systems are diagnosed with scan tools , mechanical, chemical, and electrical tools to show how the car operates due to sensors and chemical devices... First you need to get an over-look , look over , or over-view of the vehicle with a computer system... You need to identify any problems with the primary Physical connections and mechanical parts... Like battery charge, Vacuum leaks, Non standard/ Improper Modifications or Changes...Look for loose wires, corrosion, empty reservoirs, damage to parts or electrical parts... Look inside the car for modifications to any interior part , electrical, switches, or gauges... You will have a basis for diagnosis depending on the cars owner or the repairee... If the car runs, but their is some dysfunction or problem, then these are the first steps called VISUAL INSPECTION and Automotive Technical Information...

You NEED TO START WITH A GOOD SCAN TOOL...ACTRON CP9580 is a GOOD START...Around $260 or less ,depending on the age and usage...

You may also need Wrenches, Torx And Screw Driver Head, Ratchets, Extensions, Pliers, O-ring Pliers, Torque Wrenches, Pry Bar, Feeler Gauge, Micrometer, Dial Caliper, Thread Measurer (thread Pitch & Deep & width) Type THREAD) Tape, Pullers, Pumps, Containers, Rubber Dead blow Hammers, Hammers, Punches, Air tools, Air Compressor and parts, Saws , Cutters, Welders, Rated House Service(Electric Amount, Bigger Badder Fuse Box), Stripers, Torches, Clampers, Crimpers Safety Material Data Sheets and Safety Equipment, KNOW YOUR STUFF , GOTO COLLEGE ITS BETTER !

There are a few sensor tests Most of the important ones , all 9 modes , AND ABS CODES...GOOD START ACTRON CP9580 SCAN TOOL...THE LESSER VALUED CODE READERS ARE NOT AS GOOD FOR DIAGNOSIS...

FOR A FIRST BOOK IN AUTOMOTIVE TRAINING, I RECOMMEND : Automotive Technology, Principles, Diagnosis, And Service by, James D. Halderman, Third Edition, Its Well Worth the money! Its Pearson and Prentice Hall, Prentice Automotive Category...April 18, 2011...

Mechanical Problems with an ENGINE, like : Vacuum leaks, Oil Leaks (HEAD PARTS(VALVE SEATS) OIL CLOGS IN OIL GALLERIES, INTAKE LEAKS, Air TUBE OR HOSE LEAKS , EGR SYSTEM LEAKS, EVAP SYSTEM LEAKS, COOLANT SYSTEM LEAKS, HEAD GASKET LEAKS, or DAMAGED MECHANICAL, CASE , BLOCK, OR ROTATING PARTS, BEARINGS, SHAFTS, OR OIL PUMP, ALL MAKE EXPENSIVE PROBLEMS...SOMETIMES A CAR HAS SO MANY PROBLEMS IT COULD TAKE A REALLY TALENTED MECHANIC A WEEK OR MORE TO DIAGNOSE 100 %...

One of the Best DIY AUTOMOTIVE WEBSITES ARE : www.alldatadiy.com PAID SUBSCRIPTION!

KEEP IN MIND LEGALITY IS OF THE ESSENCE AND I CAN NOT PROMISE THIS INFORMATION IS 100 % Accurate, USE AT YOUR OWN RISK!

Two More Books Would be : How to Diagnose and Repair Automotive Electrical Systems by: Tracy Martin: MotorBooks WorkShop ISBN -13: 978-0-7603-2099-0, AND :

Delmar's Standard TextBook of Electricity by Stephen L. Herman Revised Delmar Publishers Inc. ISBN: 0-8273-6849-6...

Haynes and Chiltons Both are respectable Automotive Repair Manuals...

BRAKES COME FIRST! THEN SUSPENSION! TIRES ARE ALSO VERY IMPORTANT!

ANOTHER ANSWER!

High Authority Sensors Use Physical and Chemical Data, Known as reactions to Monitor, Relay, or Instruct a Process to Function, Operate, Process, Detect, React, Change, or Cause aChemical, Mechanical, or Physical Position, Disposition, Action, or Reaction based on process function...These All Communicate due to Charge and Energy Laws and are the Vital System Sensors that have the Most Effect in that system...

Most High Authority Sensors in Automobiles are MAF, MAP(Manifold Absolute Pressure / INTAKE VACUUM), O2(Polution), ECT (ENGINE COOLANT TEMP), IAT(INTAKE AIR TEMP), CPS(CRANK POSITON SENSOR), CAM PS, VSS(VEHICLE SPEED SENSOR), IAC Valve(IDLE AIR CONTROL VALVE), ECU, PCM (COMPUTER), Brake Sensor For Traction Control and ABS, TPS(Throttle POSITION SENSOR), BCM(BODY CONTROL MODULE), ANTI THEFT SENSORS, LIGHT SENSORS(REACTIVE RESISTORS), TRANSMISSION/TRANSAXLE SENSORS, AIR BAG SENSORS, CRASH SENSORS)FUEL TANK SAFTEY SENSORS, BRAKE PEDAL SENSORS, just to name some common terms...

They all Are Vital any where to fuel economy, to pollution , to VEHICLE OPERATION, to Saftey....

FOR A FIRST BOOK IN AUTOMOTIVE TRAINING, I RECOMMEND : Automotive Technology, Principles, Diagnosis, And Service by, James D. Halderman, Third Edition, Its Well Worth the money! Its Pearson and Prentice Hall, Prentice Automotive Category...

MANUFACTURER MANUALS ARE ALSO NECESSARY FOR SPECIFICS!

GM HAS A LIBRARY OF GM REPAIR INFORMATION NOW!

There is also motor.com