NOTE: Test numbers refer to numbers on diagnostic chart.

6) Remaining tests check ability of EGR valve to interact with exhaust system. This system uses a positive backpressure EGR valve which will not hold vacuum until sufficient exhaust backpressure is at base of EGR valve.
7) EGR valve diaphragm should move when sufficient backpressure is at base of valve and when vacuum is being supplied to valve. Rapidly snapping throttle from idle should provide sufficient backpressure to close internal valve vacuum bleed. With valve bleed closed, jumpered vacuum supply can now lift 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 valve.

Fig 1: Code 32 Flow Chart (2 OF 3) EGR System Error

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Code 32 - EGR System Error - Positive BACKPRESSURE (2 Of 3)