Transmission Diagnostic Procedures
Transmission failures can occur in many ways, from a small light on the dash with no noticeable problems, to whining or grinding noises that leave you stranded. Because many transmission problems are easily and inexpensively corrected, a missed diagnosis could cost you thousands of dollars. The shop you choose should have the equipment and expertise necessary to isolate the small problems from the big ones.
Diagnosis of Simple Transmission Problems
Before work is performed, the transmission problem should have an initial diagnosis. Because we commonly see the same failures within the same type of transmission, some diagnosis can be done in as little as 20 minutes and usually while you wait.
Diagnosis of Complex Computer Controlled Transmission Problems
The transmissions in almost all vehicles built in the last fifteen years are computer controlled. Data is collected from various sensors on the engine and transmission, and calculations are made to control shift timing and firmness. Quite often a failed electronic component will create the illusion of an internal transmission problem.
Scanners do a great job of checking codes and identifying simple electrical transmission problems, however, they are inadequate in solving complex electronic issues, which can take much longer to diagnose. We utilize equipment that allows us to operate the transmission independently of the vehicle’s electronic control module, the ‘computer’. We can also monitor specific signals given by the electronic control module to the transmission. This technique eliminates the uncertainty between computer, vehicle wiring, and transmission electronic control issues.
Intermittent Transmission Problems
Some transmission problems are sporadic. These issues, usually electronic, may be difficult to diagnose unless the problem occurs while being driven with test equipment attached.
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