Code P048, EGR System Malfunction: Action
WARNING: This page is about a different car, the 1995 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
PCM turns on MIL and disables EGR system.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Checks EGR operation using PCM override.
- Checks if EGR gases enter intake manifold by raising EGR valve off its seat.
- Checks if EGR solenoid is able to pass vacuum.
- With engine at idle, EGR solenoid should be energized. Test light connected across EGR solenoid terminals should be illuminated.
- Checks PCM's ability to turn off EGR solenoid.