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2008 - MX-5 - Engine

WARM-UP THREE-WAY CATALYTIC CONVERTER (WU-TWC) INSPECTION [LF]

NOTE:

1. Connect the M-MDS and monitor PIDs as following.
2. 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. Idle the engine.
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.

Upstream HO2S graph line example

Downstream HO2S graph line example 1

Downstream HO2S graph line example 2

Downstream HO2S graph line example 3



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