I/M Catalyst System Set Procedure
INSPECTION/MAINTENANCE (I/M) CATALYST SYSTEM SET PROCEDURE
DESCRIPTION
The purpose of this test is to satisfy the enable criteria necessary to execute inspection/maintenance (I/M) readiness diagnostics for the Catalyst System. The test may be used to set the I/M System Status indicators to YES.
CONDITIONS FOR RUNNING
- The barometric pressure (BARO) is more than 74 kPa.
- The engine coolant temperature (ECT) is more than 63°C (145°F).
- The engine is in closed loop fuel control.
DIAGNOSTIC AIDS
The control module runs a maximum of 12 tests per trip until the Catalyst System Status updates to YES. If the status does not update, the test outlined in this procedure can be repeated until the I/M System Status updates to YES.
If there is an impending failure, the system may require more time to run the diagnostic than was allotted in the set procedure. If the test does not run after numerous attempts and no DTC is set, review the appropriate scan tool data list and the service information for an indication of why the test does not complete. Some tests may abort due to changes in the conditions while the test is running. For example, changes in engine load such as a cooling fan or A/C compressor clutch turning ON may cause the test to abort.
TEST
