Code 32, EGR System Error (2 Of 3) Positive BACKPRESSURE
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- 6) Remaining tests check the ability of the EGR valve to interact with the exhaust system. This system uses a positive backpressure EGR valve which will not hold vacuum until sufficient exhaust backpressure is at the base of the EGR valve.
- 7) EGR valve diaphragm should move when sufficient backpressure is at the base of the valve and when vacuum is being supplied to the valve. Rapidly snapping the throttle from idle should provide sufficient backpressure which will close internal valve vacuum bleed. With valve bleed closed, the jumpered vacuum supply can now lift the valve off its seat.
- 8) Excessive exhaust backpressure from bent or restricted exhaust system components could provide enough backpressure at base of EGR valve to allow undesired EGR action at idle.
- 9) Plugged EGR exhaust passages can block exhaust backpressure at base of EGR valve. If this occurs, internal EGR valve bleed will remain open, preventing vacuum from operating the valve.