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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1851 (Engine Controls And Fuel - 3.5L (L66) - Troubleshooting & Diagnosis) >> Inspection/Maintenance Evaporative Emission System Set >> Diagnostic Aids >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic table.

  1. 1:  Make sure you perform the I/M System Check before performing this test. Failure to do so may result in difficulty updating the status to YES.
  2. 2:  The EVAP System test runs immediately following the idle period.
  3. 3:  This step is to identify a first failure of a type B DTC. A DTC only appears on the I/M System Status display when the DTC becomes a MIL illuminating DTC. This occurs on the second failure of a type B DTC. A first failure of a type B DTC will not allow the I/M System Status to update to YES. Refer to Diagnostic Aids in this test.
  4. 4:  This step is to help identify any unique or unusual criteria required to run the diagnostic test in the event the universal set procedure does not. This information is located in the service information under Conditions for Running the DTC.
  5. 5:  The I/M System Status only reports on whether or not a diagnostic has run, not what the outcome of the test was. If any emission related DTC sets after the tests are complete, the DTC will require diagnosis.
Inspection/Maintenance Evaporative Emission System Set

Step Action Yes No
1  Did you perform the Inspection/Maintenance (I/M) System Check? Go to Step 2  Go to Inspection/Maintenance (I/M) System Check 
2 
  1. Ensure the vehicle is within the Conditions for Running specified in the supporting text.
  2. Turn OFF all of the accessories, e.g., A/C, blower fan, etc.
    3. IMPORTANT: Once the engine is started, DO NOT turn OFF the engine for the remainder of the procedure until the test is complete.
  3. Start and idle the engine.
    4. CAUTION: Refer to ROAD TEST CAUTION .
    IMPORTANT: In order for this test to run, the vehicle must operate in the following conditions:
  4. Idle the engine until the engine reaches operating temperature of at least 70°C (158°F). This may be up to 8-10 minutes depending on the start up coolant temperature.
  5. Acceleration at part throttle to 48-80 km/h (30-50 mph) and cruise for 3 minutes after the engine reaches operating temperature.
  6. Deceleration to 0 km/h (0 mph).
  7. Engine idling for 1 minute while the following criteria is maintained:
    • Service brake depressed
    • Automatic transmission in drive
    • Manual transmission in neutral with the clutch pedal depressed
  8. Accelerate at part throttle to 64-72 km/h (40-45 mph) with this speed maintained for 1 minute.
  9. With a scan tool, observe the I/M System Status display.
Did the EVAP System Status update to YES?		 Go to Step 5  Go to Step 3 
3  With a scan tool, observe the DTC Information.
Does the scan tool indicate any failed DTCs?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 4 
4 
  1. Refer to the Inspection/Maintenance (I/M) System DTC Table  to determine which DTCs are required to run in order to complete this test.
  2. Operate the vehicle within the Conditions for Running the DTC, located in the supporting text for the diagnostic table of the DTC.
  3. Repeat the procedure until the scan tool indicates the diagnostic test has run.
  4. With a scan tool, observe the I/M System Status display.
Did the EVAP System Status update to YES?		 Go to Step 5  Go to Diagnostic Aids In This Test
5  With a scan tool, observe the Emission Related DTC portion of the I/M System Status display.
Does the scan tool indicate any Emission Related DTCs set?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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