Exhaust Gas Recirculation (Port Fuel Injection)

Fig. 002 - WIRING DIAGRAM for Chart C-7 EGR Check. VIN 3, VIN 9:

CHART C-7, EXHAUST GAS RECIRCULATION

The EGR valve is controlled by a normally closed solenoid (allows vacuum to pass when energized). The ECM energizes the solenoid to turn the EGR on, and monitors vacuum to the EGR with the EGR diagnostic switch. Any EGR problem caused by the control solenoid, vacuum switch, wiring, or a vacuum leak will be detected by the ECM, and failure Code 32 will be set. Chart C-7 checks for two problems; plugged EGR passages, or a sticking EGR valve.
Code 32 will set if:
a. There is no vacuum at EGR switch above idle, or there is vacuum at idle.
b. There is a vacuum leak between EGR solenoid and EGR valve.

Fig. 001 - Chart C-7 EGR Check:

1. Checks for a sticking EGR valve. If sticking, remove and examine valve to determine whether it can be cleaned, or must be replaced. A sticking EGR valve will most likely cause a rough idle condition.
2. Checks for plugged EGR passages. If passages are plugged, the engine may have severe detonation on acceleration.