I/M EVAP System Set Procedure
INSPECTION/MAINTENANCE (I/M) EVAPORATIVE EMISSION (EVAP) SYSTEM SET PROCEDUREDESCRIPTION
The purpose of this procedure is to satisfy the enable criteria necessary to execute an inspection/maintenance (I/M) system monitor for the evaporative emissions (EVAP) system. The system monitor is comprised of the test results from one or more DTCs. This procedure may be used to set the EVAP I/M System Status display on the scan tool to YES. The EVAP 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 EVAP I/M System Status display will be updated to YES.
CONDITIONS FOR RUNNING
- The barometric pressure (BARO) is more than 74 kPa.
- The start- up engine coolant temperature (ECT) is less than 30°C (86°F).
- The intake air temperature (IAT) is between 4- 30°C (40- 86°F).
- The difference between the start- up ECT and the IAT is less than 8°C (14.4°F).
- The fuel level is between 1/4- 3/4.
- The battery voltage is between 10-18 volts.
DIAGNOSTIC AIDS
Extreme high or low ambient temperatures may prevent DTCs from initiating. Rough road conditions, a damaged or improperly connected fuel cap, and high fuel volatility may caused DTCs to abort or fail. High fuel volatility usually means that the fuel in the vehicle has a higher volatility than what is appropriate for the ambient temperatures. This can occur when winter fuel is used during warm temperatures. DTCs may also 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. Failed or aborted DTCs will require the vehicle to cool down in order to meet the conditions for running for another drive cycle. If there is an impending failure, the system may require more time to run than was allotted in the procedure. If any DTCs do not run after numerous attempts and no DTC is set, review the scan tool data list and conditions for funning. This will give an indication of why the DTCs do not complete. If the EVAP I/M System Status does not update to YES, the procedure can be repeated until a YES status is achieved.
TEST
