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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Engine Controls And Fuel - 6.0L (L96 LC8) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0442 or P0455 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • The pressure must not exceed 13 in H2O (0. 5 PSI) as pressure in excess of this could cause system components to perform inaccurately. - Evaporative Emission (EVAP) System
  • Before proceeding with this test, review the tool user manual for Safety Information and Instructions. - GE-41413-A / B Evaporative Emissions System Tester (EEST)
  • Larger volume fuel tanks, and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize or produce smoke from a leak.
  • Make sure the underbody temperature of the vehicle and the tester temperature are similar.
  1. Disconnect the evaporative emission pipe quick connector. @ Q12 Evaporative Emission Purge Solenoid Valve
  2. Connect the special tool: CH-48096 EVAP Service Port Access Tool @ Evaporative Emission Canister Purge Tube
  3. Connect the special tool: GE-41413-A / B Evaporative Emissions System Tester (EEST) @ CH-48096 EVAP Service Port Access Tool
  4. Calibrate - GE-41413-A / B Evaporative Emissions System Tester (EEST) - Flow Meter = 0. 51 mm (0. 020 in)
  5. Perform the scan tool function: EVAP Purge/Seal - Not Venting
  6. Use the special tool: GE-41413-A / B Evaporative Emissions System Tester (EEST)
  7. Verify the tool reading: Flow Meter = Below: Floating Indicator
    • Above: Floating Indicator 
    1. Use the special tool: GE-41413-A / B Evaporative Emissions System Tester (EEST) Switch - Smoke
    2. Use the special tool: GE-41413-SPT High Intensity White Light - Inspect for Leaks
      • If a leak is present

        Repair or replace the components as necessary.

      • Go to next step: If no leak is present
    • Go to next step: Below: Floating Indicator 
  8. All OK.
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