Fuel Delivery and Air Induction: Testing and Inspection

The technician should be aware that diagnosis and testing of the Multi-Port Sequential Fuel Injection (SFI) system should begin at the Powertrain Management System level, where testing begins with Diagnosis by Symptom, and is narrowed to testing of a "specific" subsystem and it's related wiring and components. Following the appropriate diagnostic routines may prevent misdiagnosis and unnecessary component replacement. Refer to Powertrain Management/Testing and Inspection/Procedures.