I/M EVAP System Set Procedure
INSPECTION/MAINTENANCE (I/M) EVAPORATIVE EMISSION (EVAP) SYSTEM SET PROCEDURE
DESCRIPTION
This test satisfies 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. Service bay tests are included on the scan tool for some systems depending upon vehicle make and model. The test is designed to allow the EVAP diagnostic tests to run in service bay conditions. Ensure that the vehicle meets the requirements listed in Conditions for Running before performing either EVAP system test. Failure to meet the necessary requirements may produce inaccurate test results.
CONDITIONS FOR RUNNING
Scan Tool Service Bay Test Equipped Vehicles
- Stored engine controller DTCs have been cleared.
- The battery voltage is between 10-18 volts.
- The engine coolant temperature (ECT) is less than 70°C (158°F) at start-up.
- The fuel level is 15-85 percent.
- The vehicle must be in Park or Neutral during the test.
- The test can take up to 17 minutes to complete and set the I/M system status, depending on the fuel level and the fuel volatility.
Non Scan Tool Service Bay Test Equipped Vehicles
- DTCs P0442, P0446, P0455, P0496 are not set.
- The start-up intake air temperature (IAT) is between 4-30°C (39-86°F).
- The ECT is less than 30°C (86°F).
- The start-up IAT and ECT are within 8°C (15°F).
- The barometric pressure (BARO) is more than 74 kPa.
- The ambient air temperature is between 2-32°C (36-90°F).
- The engine run time minimum is 10 minutes.
- The trip drive length is more than 5 kilometers (3.1 miles).
- The ECT is more than 70°C (158°F).
- The fuel level is between 15-85 percent.
- The above conditions must be met a minimum of three times for DTC P0442 System Small Leak Detected to report a pass.
DIAGNOSTIC AIDS
Extreme high or low ambient temperatures may prevent the EVAP system tests from initiating. Performing an inspection prior to running the EVAP Service Bay Test may prevent having to repeat the test. A loose fuel cap may cause a Service Bay Test to abort or fail and prevent the I/M system status from updating. A failed or aborted test will require the vehicle to cool down in order to meet the enable criteria to run another test.
The I/M system status does not indicate whether the test has passed or failed, only that a decision was made. 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 required tests have not run. When a failure occurs, the emission related DTC portion of the I/M system status display will indicate the malfunction indicator lamp (MIL) is requested. The I/M system status also registers the number of DTCs.
TEST
