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Assume nothing, test everything: Cutting corners and assuming results only wastes time and money.

Published: February 25, 2013

Repair ShopFollow the diagnosis process from a professor and professional on a Dodge pickup:

We have a 2011 Dodge pickup truck on loan so one of my students can perform research on Active Regeneration of the Diesel Particulate Filter (DPF) and the NOx absorbing catalyst (NAC). I was told the truck had a new Engine Control Module (ECM) to cure issues with hard starting, low power, and multiple Diagnostic Trouble Codes (DTCs) intermittently showing up. I was assured the truck was now fixed…

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