I/M EVAP System Set Procedure
INSPECTION/MAINTENANCE (I/M) EVAPORATIVE EMISSION (EVAP) SYSTEM SET PROCEDUREDESCRIPTION
The purpose of this test is to satisfy the enable criteria necessary to execute inspection/maintenance (I/M) readiness diagnostics for the evaporative emission (EVAP) 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 indicates whether or not 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. Performing a visual inspection prior to running the EVAP test may prevent having to repeat the test due to the fact that a failed or aborted test will require the vehicle to cool down in order to meet the enable criteria to run another test.
CONDITIONS FOR RUNNING
- The barometric pressure is more than 74 kPa.
- The engine coolant temperature (ECT) is below 30°C (86°F).
- The fuel level is between 15-85 percent.
- The battery voltage is between 10-18 volts.
- The intake air temperature (IAT) is between 4-30°C (39-86°F).
- The startup ECT and IAT are within 8°C (14°F) of each other.
- The vehicle speed sensor (VSS) is less than 121 km/h (75 mph).
DIAGNOSTIC AIDS
Extreme high or low ambient temperatures may prevent the EVAP System Tests from initiating.
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
