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. The I/M System Status display on the scan tool provides an indication of whether the control module has completed the required tests. The I/M System Status does not indicate that the tests have passed or failed. When all of the diagnostics for a specific system have run and passed, the I/M System Status will update to YES. If a test for a specific system has failed, the I/M System Status will update to YES, indicating a determination was made even if all of the other tests for that system have not run.
CONDITIONS FOR RUNNING
- The engine has been running longer than 10 minutes.
- The engine load must be stable.
- The idle air control (IAC) position parameter does not change more than 5 counts.
- The throttle position is below 1.5 percent.
- The short term fuel trim (FT) is between -20 and +20 percent.
- The transaxle is in drive for automatic transaxles, or in neutral for manual transaxles with the clutch pedal depressed.
- The barometric pressure is more than 74 kPa.
- The engine coolant temperature (ECT) is between 75-126°C (167-258.8°F).
- The engine is in Closed Loop fuel control.
- The battery voltage is more than 10.7 volts.
- The intake air temperature (IAT) is between -20 and +100°C (-4 and +212°F).
- The difference between the engine speed and the desired engine speed is less than 200 RPM.
- The mass air flow (MAF) is between 3-10 grams per second.
DIAGNOSTIC AIDS
The control module runs a maximum of 6 tests per trip until the Catalyst System Status updates to YES. If the status does not update, the test outlined in this procedure may be repeated until the I/M System Status updates to YES.
TEST
