Cummins Inline 7

My diagnostic tool suggestions

Choosing a diagnostic tool shouldn’t be taken lightly. It is an investment for the future! The list has been compiled based on my diagnostic and training experience. I still use the majority of them almost daily!

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Cummins X12 Injector

Does fuel injector polarity matter?

Some engine manufacturers such as Cummins, use injectors without connector plugs or with unmarked terminals. If this is the case, how should we connect the cables on the injector? Will the ECU show injector faults if we reverse the polarity? Does injector polarity matter?

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