I/M Catalyst System Set Procedure

DESCRIPTION
This test satisfies the enable criteria necessary to execute I/M readiness diagnostics for the catalyst system. The test may be used to set the I/M System Status indicators to YES. Ensure that the vehicle meets the requirements listed in Conditions for Running before performing this test. Failure to meet the necessary requirements may produce inaccurate test results.

CONDITIONS FOR RUNNING
^ The barometric pressure (BARO) is more than 72 kPa.
^ The engine coolant is at operating temperature, 75-125°C (167-257°F).
^ The intake air temperature (IAT) is between -20 to +80°C (-4 to +176°F).
^ The engine is in Closed Loop fuel control.
^ The engine has run for 6-8 minutes off idle in order to initiate test.
^ The battery voltage is 9-16 volts.

TEST DESCRIPTION

Inspection/Maintenance (I/M) Catalyst System Set Procedure - Steps 1-5:

The numbers below refer to the step numbers on the diagnostic table.
1. Perform the I/M System Check before performing this test. Failure to do so may result in difficulty updating the status to YES. Inspection/Maintenance (I/M) System Check
2. The Catalyst Test during the idle period immediately following the cruise period.
3. This step identifies a first failure of a type B DTC. A DTC only appears on the I/M System Status display when the DTC becomes a MIL illuminating DTC. This occurs on the second failure of a type B DTC. A first failure of a type B DTC will not allow the I/M System Status to update to YES. Refer to Diagnostic Aids.
4. This step identities any unique or unusual criteria required to run the diagnostic test in the event the universal set procedure does not. This information is located in the service information under Conditions for Running the DTC.
5. The I/M System Status only verifies whether a diagnostic has run, not the outcome of the test. If any Emission Related DTC sets after the tests are complete, the DTC will require diagnosis.