Mazda 6 manuals

Mazda 6 Service Manual: Three-way catalytic converter (twc) inspection

Mazda 6 Service Manual / Fuel and emission control systems / Emission system / Three-way catalytic converter (twc) inspection

Note

1. Connect the WDS or equivalent and monitor PIDs as following.

2. Begin to monitor the appropriate PIDs.

3. Drive the vehicle for 10 min at 65-96 km/h {40-60 mph}

to allow the front catalytic converter to reach operating temperature.

4. Stop the vehicle and leave it in a safe place.

5. Let the engine idle.

6. Record PIDs for 1 min.


7. Select the appropriate PIDs and read the graph.

8. Count the number of times (inversions) that the upstream HO2S graph line actually crosses the 0.5 V

line.

9. Count the number of times (inversions) that the downstream HO2S graph line actually crosses the 0.5 V

line.

Note

10. Using the following equation, calculate the value of ratio.

Equation
RATIO = Upstream HO2S inversion ÷ downstream HO2S inversion

Upstream HO2S graph line example


Downstream HO2S graph line example 1

Equation
RATIO = 30 inversions (upstream HO2S inversions) ÷ 5 inversions (downstream HO2S inversions) = 6.0 (good WU-TWC)


Downstream HO2S graph line example 2


Downstream HO2S graph line example 3

Equation
RATIO = 30 inversions (upstream HO2S inversions) ÷ 27 inversions (downstream HO2S inversions) = 1.1 (bad converter)


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Control system
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