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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 636 (Engine Controls Diagnosis - 3.6L (Ly7) (DTC P0442 - DTC P167A)) >> Diagnostic Trouble Codes >> DTC P0442 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3:  Introducing smoke in 15 second intervals may allow smaller leak areas to be more noticeable. When the system is less pressurized, the smoke will sometimes escape in a more condensed manner.
  2. 5:  This step verifies that repairs are complete and that no other condition is present.
P0442 Evaporative Emission (EVAP) System Small Leak Detected

Step Action Yes No
Schematic Reference: Evaporative Emissions (EVAP) Hose Routing Diagram
1 Did you perform the Diagnostic System Check-Engine Controls? Go to Step 2  Go to Diagnostic System Check - Engine Controls
2
  1. Inspect the evaporative emission (EVAP) system for the following conditions:
    • Loose, missing, or damaged service port dust cap and/or schrader valve
    • Loose, incorrect, missing, or damaged fuel fill cap
    • A damaged EVAP purge solenoid
  2. Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Inspect the EVAP system for the following conditions:
    • Disconnected, improperly routed, kinked, or damaged EVAP pipes and hose
    • A damaged EVAP vent valve or EVAP canister
Did you find and correct the condition?		 Go to Step 5  Go to Step 3 
3 
IMPORTANT: Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilize before starting the diagnostic procedure. System flow will be less with higher temperatures.
  1. Turn OFF the ignition.
  2. Connect the J 41413-200  Evaporative Emissions System Tester (EEST) power supply clips to a known good 12-volt source.
  3. Install the J 41415-40  Fuel Tank Cap Adapter to the fuel fill pipe.
  4. Connect the J 41413-200  nitrogen/smoke supply hose to the J 41415-40  .
  5. Turn ON the ignition, with the engine OFF.
    6. IMPORTANT: The DTCs may need to be cleared if the output control does not operate.
  6. Command the EVAP vent valve closed with a scan tool.
  7. Turn the nitrogen/smoke valve on the J 41413-200  control panel to SMOKE.
  8. Use the remote switch on the J 41413-200  to introduce smoke into the EVAP system.
  9. Use the J 41413-VLV  EVAP Port Vent Fitting tool to open the EVAP service port.
  10. Remove the J 41413-VLV  once smoke is observed.
  11. Continue to introduce smoke into the EVAP system for an additional 60 seconds.
  12. Inspect the entire EVAP system for exiting smoke with the J 41413-SPT  High Intensity White Light.
  13. Continue to introduce smoke at 15 second intervals until the leak source has been located
Did you locate and repair a leak source?		 Go to Step 5  Go to Step 4 
4
  1. Disconnect the J 41415-40  from the fuel fill pipe.
  2. Install the fuel fill cap to the fuel fill pipe.
  3. Connect the J 41413-200  nitrogen/smoke supply hose to the EVAP service port.
  4. Use the remote switch on the J 41413-200  to introduce smoke into the EVAP system.
  5. Inspect the entire EVAP system for exiting smoke with the J 41413-SPT  .
  6. Continue to introduce smoke at 15 second intervals until the leak source has been located.
Did you locate and repair a leak source?		 Go to Step 5  Go to Diagnostic Aids
5 
IMPORTANT: Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
  1. Turn the nitrogen/smoke valve to nitrogen.
  2. Connect the nitrogen/smoke hose to the 0.5 mm (0.020 in) test orifice on the bottom-front of the J 41413-200  .
  3. Use the remote switch to activate the J 41413-200  .
  4. Align the red flag on the flow meter with the floating indicator. Use the remote switch to de-activate the J 41413-200  .
  5. Install the J 41415-40  to the fuel fill pipe.
  6. Remove the nitrogen/smoke hose from the test orifice and install the hose onto the J 41415-40  .
  7. Turn ON the ignition, with the engine OFF.
    8. IMPORTANT: The DTCs may need to be cleared if the output control does not operate.
  8. Command the EVAP vent solenoid closed with a scan tool.
  9. Use the remote switch on the J 41413-200  to introduce nitrogen and fill the EVAP system until the floating indicator stabilizes.
  10. Compare the flow meter's stable floating indicator position to the red flag.
Is the floating indicator below the red flag?		 Go to Step 6  Go to Step 2 
6
  1. Clear the DTCs with a scan tool.
  2. Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 Go to Diagnostic Trouble Code (DTC) List System OK
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