mazda Workshop Repair Guides

Mazda Workshop Service and Repair Manuals

Exhaust Manifold > < Exhaust System - Excessive Sulfur Odors|Page 1451
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If the ratio is less than 2, the WU-TWC is not functioning properly. Replace the WU-TWC.

Downstream HO2S Graphline Example 2

Equation
RATIO = 26 inversions (upstream HO2S inversions) + 7 inversions (downstream HO2S inversions) = 3.7 (good converter)

Downstream H02S Graphline Example 3

Equation
RATIO = 26 inversions (upstream HO2S inversions) + 19 inversions (downstream HO2S inversions) = 1.4 (bad converter)

Exhaust Manifold > < Exhaust System - Excessive Sulfur Odors|Page 1451