ECM controls EGR valve operation. ECM will ground EGR Vacuum Switching Valve (VSV) to turn EGR valve on and off. An EGR back pressure transducer determines how long EGR valve stays on, based on exhaust back pressure supplied to transducer through tube "S". EGR monitors integrator to determine if EGR system is functioning.

ECM will command EGR valve off briefly when EGR should be on. Integrator will change at least 3 counts, indicating EGR valve closed on command. ECM will recheck EGR system again, commanding EGR valve on when valve should be off. Integrator will change at least 3 counts, indicating EGR valve opened on command. If EGR system fails test 5 times, Code 32 will set and CHECK ENGINE light will turn on.

NOTE: Test numbers refer to numbers on diagnostic chart.

Ensures EGR valve opens and EGR passage is not restricted.
Ensures EGR vacuum switching valve is operating properly.
Checks EGR back pressure transducer operation.
Test voltage source to EGR valve vacuum switching valve.
Checks EGR valve for proper operation.
Checks operation of ECM circuit to EGR vacuum switching valve.

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: Notes

Use the Manual With the Right Hardware

When to See a Mechanic

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