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 heated oxygen sensor (HO2S)/oxygen sensor (O2S) 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 test. The required test is complete when either all of the DTCs comprising the test have run and passed, or when any one of the DTCs comprising the test has illuminated the malfunction indicator lamp (MIL). Once the test is complete, the I/M System Status display will indicate YES in the Completed column.
CONDITIONS FOR RUNNING
- DTCs P0133, P0140, P1133, P1134, and P2A01 are not set.
- The following DTCs, if applicable, are not set:
- P0153
- P0160
- P1153
- P1154
- P2A03
- The start-up 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 start-up 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 A/C compressor clutch turning ON may cause the test to abort.
TEST
