EFI/DFI Series (Part III): EFI/DFI Troubleshooting

摘要

In part two of our series on electronic fuel-injection (EFI) and digital fuel-injection (DFI) engines in August 2009 OPE, we covered some components that can be tested but not repaired. This could be due to the component - engine control unit (ECU), an electrical relay, a manifold absolute pressure (MAP) sensor- and/or the cost to repair might be in excess of a new part (a fuel injector). In this article, we will cover troubleshooting the EFI/DFI systems when a fault code is given. Most of the EFI/DFI engines are equipped with a diagnostic lamp or a Malfunction Indicator Light (MIL) (see Figure 1).