So You Want To Do Some Diagnostic Work!

FORScan is a software scanner for Ford, Mazda, Lincoln and Mercury vehicles, designed to work over ELM327 and J2534 Pass-Thru compatible adapters. 

Supported vehicles:

All Ford, Mazda, Lincoln, Mercury vehicles that can be addressed by supported adapters. It is 99% of models after 2000 and around 92% of models after 1996 (the year when OBD2 became a standart in USA)

FORScan is designed especially for Ford, Mazda, Lincoln and Mercury vehicles. It supports specific features of the manufacturer protocols, making the FORScan more powerful in work with these models than any regular OBD2 scanner.

For example, FORScan can detect modules which are not visible for regular OBD2 scanners, can show you trouble codes which are never displayed by OBD2 scanners, can show you PIDs which are not supported by any OBD2 scanner, run specific tests and service procedures. In other words, FORScan can do things that regular OBD2 scanners can not do.

 

Main features

  • Detect vehicle on-board network configuration

  • Read and reset Diagnostic Trouble Codes from all modules (see list of supported modules)

  • Reading of modules' sensors' data

  • Run test diagnostic procedures (not supported in FORScan Lite yet)

  • Run service procedures (not supported in FORScan Lite yet)

     

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Diagnosing with Fuel Trims

Fuel trims can help you zero in on the problem, especially when there are no other trouble codes present. Knowing whether a vehicle is running too rich or too lean will help narrow down your diagnosis. Fuel trims that differ greatly from one cylinder bank to the other will also point you in the right direction. Always evaluate fuel trims at idle and at 2500 RPM.

Running too rich – High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative emissions components, leaking injectors, defective O2 sensors, exhaust leaks/pinholes before the O2 sensor, coolant temp sensor problems, and base engine issues such as low compression and incorrect camshaft timing. 

Running too lean – High positive fuel corrections can be traced to MAF and O2 sensor faults, vacuum leaks from intake gaskets/hoses, unmetered air (intake snorkel leak), clogged or dirty fuel injectors, fuel delivery issues, and exhaust restrictions such as a clogged catalytic converter.

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