Test DN: Step 40

40) KOER Code 33: Check Vacuum at EGR  KOER Code 33 indicates that EVP sensor input did not change after ECA signaled EGR operation. Because a Code 84 was not received in the KOEO Self-Test, the EVR solenoid electrical function is okay. The lack of Code 32 or 34 indicates the EVP sensor is within the closed position specifications. Possible causes for this fault are: leaking vacuum hose, restricted vacuum hose, restricted EVR solenoid filter, or a faulty EGR valve.

Turn key off. Disconnect vacuum line from EGR valve. Connect a vacuum gauge at open end of line. Perform KOER Self-Test and observe vacuum gauge. If reading is greater than 1.5 in. Hg, remove vacuum gauge and go to step 43). If not, remove vacuum gauge, reconnect EGR valve vacuum line and go to next step.

41) Verify Vacuum Supply to EVR Solenoid  Turn key off. Disconnect vacuum source to EVR solenoid. Install vacuum gauge at source vacuum hose. Start engine and check vacuum. If reading is 10 in. Hg or more, go to next step. If reading is less than 10 in. Hg, check vacuum hose to EVR solenoid. Replace if necessary. Repeat QUICK TEST.