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JFP in PA, You sent me the response (below) to my post o 1/31.

Two of the specific diagnostics steps in the decision tree for P0430 are to check the EVAP canister purge valve and the line connecting the EVAP canister purge valve and in intake system, as a problem with either will throw off the TWC conversion on bank 4-6. As you are showing a “fail” for the fuel tank ventilation system, which is the EVAP system, I’d start looking there.

I wish to follow on HOW TO: check the EVAP canister purge valve and the line connecting the EVAP canister purge valve. Can you offer any advise on how to go about testing the system, or the decision tress steps? I have read a lot of post regarding discussing EVAP issues, but I have no related codes showing up only the Durametric Ready status "fuel tank ventalation / FAIL" when activating fuel evaporative valve test. Thanks for your help, Phil

JFP in PA, You sent me the response (below) to my post o 1/31.

Two of the specific diagnostics steps in the decision tree for P0430 are to check the EVAP canister purge valve and the line connecting the EVAP canister purge valve and in intake system, as a problem with either will throw off the TWC conversion on bank 4-6. As you are showing a “fail” for the fuel tank ventilation system, which is the EVAP system, I’d start looking there.

I wish to follow on HOW TO: check the EVAP canister purge valve and the line connecting the EVAP canister purge valve. Can you offer any advise on how to go about testing the system, or the decision tress steps? I have read a lot of post regarding discussing EVAP issues, but I have no related codes showing up only the Durametric Ready status "fuel tank ventalation / FAIL" when activating fuel evaporative valve test. Thanks for your help, Phil