PFI System Check
The PFI SYSTEM CHECK should be the starting point for all diagnosis. It is an organized approach for identifying a problem caused by PFI system. Driver comments normally fall into one of the following: steady Engine Control System Fault telltale, driveability problems, engine will not start or engine stalls after start.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- The SERVICE ENGINE SOON light will remain illuminated after the bulb check or after engine has started if there are one or more current codes present. The SERVICE ENGINE SOON light will turn off after 2 seconds if no current code(s) is present.
- PFI Chart A-2 diagnoses a faulty SERVICE ENGINE SOON light control circuit, the PCM or system that turns on the light but cannot communicate diagnostic codes.