If an OBD II PCM Has Set a Catalyst Efficiency

question 9

Multiple Choice

If an OBD II PCM has set a catalyst efficiency code, all of the following pre-checks should be performed before condemning the converter EXCEPT for:

• A) checking the exhaust system for any leaks
• B) using a scan tool to check for O₂ sensor codes
• C) visually checking the O₂ sensors for cracked housings
• D) verifying that the engine does not have excessive cycling

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Definitions:

Short-Run Phillips Curve

Describes the inverse relationship between the rate of inflation and the unemployment rate over a short period.

Rational Expectations

The theory that people optimally use all the information they have, including information about government policies, when forecasting the future.

Sacrifice Ratio

A measure of the economic cost associated with reducing inflation, often calculated as the percentage loss in output per percentage point decrease in inflation.

Inflation Expectations

The anticipation by consumers and businesses of the rate at which prices will rise in the future.