Catalyst System Set Procedure

INSPECTION/MAINTENANCE (I/M) CATALYST SYSTEM SET PROCEDURE

DESCRIPTION
The purpose of this procedure is to satisfy the enable criteria necessary to execute an inspection/maintenance (I/M) system monitor for the catalyst system. The system monitor is comprised of the test results from one or more DTCs. This procedure may be used to set the Catalyst I/M System Status display on the scan tool to YES. The Catalyst I/M System Status display indicates whether or not the control module has completed the system monitor. The system monitor completes when either all DTCs comprising the monitor run and pass, or any DTC comprising the monitor illuminates the malfunction indicator lamp (MIL). If one of the DTCs comprising the monitor is set and the MIL is not illuminated, the necessary trips are required to illuminate the MIL before the monitor will complete. Once the monitor completes, the Catalyst I/M System Status display will be updated to YES.

CONDITIONS FOR RUNNING
- The engine has been running longer than 10 minutes.
- The barometric pressure (BARO) is more than 72 kPa.
- Engine coolant is at operating temperature, 69-125°C (157-257°F).
- The intake air temperature (IAT) is between -20 and +80°C (-4 and +176°F).
- The engine is in closed loop fuel control.
- The battery voltage is more than 9 volts.

DIAGNOSTIC AIDS
The control module runs a maximum of 12 tests per trip. If there is an impending failure, the system may require more time than was allotted in the system set procedure. If any DTCs do not run and no DTC is set, review the appropriate scan tool data list and service information. This will give an indication of why the DTCs do not run. Some may abort due to changes in the conditions while running. For example, changes in engine load such as a cooling fan or A/C compressor clutch turning ON, may cause a DTC to abort. If the Catalyst I/M System Status does not update to YES, the procedure can be repeated until a YES status is achieved.

TEST

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