I/M HO2S/O2S System Set
INSPECTION/MAINTENANCE (I/M) HEATED OXYGEN SENSOR/OXYGEN SENSOR (HO2S/O2S) 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 oxygen sensor (HO2S) system. The test may be used to set the I/M System Status 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 coolant temperature (ECT) is less than 35°C (95°F).
- The engine is running in Closed Loop fuel control.
- The engine has been running for more than 1 minute.
- The battery voltage is between 9-18 volts.
- The mass air flow (MAF) is between 15-30 grams per second.
- The engine speed is between 1,300-3,000 RPM.
- The throttle position (TP) sensor is more than 2 percent.
- The vehicle speed sensor (VSS) is between 33-120 km/h (20-75 mph).
- The short term fuel trim is between 97.5-102.5.
- The intake air temperature (IAT) is less than 35°C (95°F).
- The start-up ECT and IAT are within 6°C (10.8°F) of each other.
- The exhaust gas recirculation (EGR) tests are not active.
- The catalyst test are not active.
- The evaporative emission (EVAP) canister purge duty cycle is more than 0 percent.
DIAGNOSTIC AIDS
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 an A/C compressor clutch turning ON, may cause the test to abort.
TEST
