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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1475 (Engine Control System - Diagnosis - 4.8L, 5.3L, & 6.0L (DTC P0172 To DTC P0507)) >> Diagnostic Information & Procedures >> DTC P0455 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. 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 proper operation of the fuel tank pressure (FTP) sensor.
  3. 6:  A normal operating FTP sensor should increase above 5 inches of H2O and stop between 6 inches of H2O and 7 inches of H2O.
DTC P0455

Step Action Values Yes No
Schematic Reference:  Emission 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 schrader valve
    • Loose, incorrect, missing, or damaged fuel fill cap
    • A damaged EVAP canister purge solenoid valve
  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 hoses
    • A damaged EVAP canister vent solenoid valve or EVAP canister
Did you find and correct the condition?		 - Go to Step 16  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. Command the EVAP canister vent solenoid 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 to introduce smoke into the EVAP system.
  9. Use the J 41413-VLV  EVAP Service Port Vent Fitting 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 16  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 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 16  Go to Step 5 
5 
  1. Use the remote switch to stop introducing smoke.
  2. Install the J 41415-40  to the fuel fill pipe.
  3. Connect the J 41413-200  nitrogen/smoke supply hose and vehicle fuel fill cap to the J 41415-40 
  4. Command the EVAP canister vent solenoid valve open with a scan tool.
  5. Compare the fuel tank pressure sensor parameter with a scan tool to theJ 41413-200  pressure/vacuum gage.
Is the scan tool fuel tank pressure sensor parameter within the specified value of the J 41413-200  pressure/vacuum gage?		 1 in H2O Go to Step 6  Go to Step 12 
6 
  1. Seal the EVAP system using the EVAP Purge/Seal function with a scan tool.
  2. Turn the nitrogen/smoke valve on the J 41413-200  control panel to NITROGEN.
  3. Use the J 41413-200  to pressurize the EVAP system to the first specified value.
Is the fuel tank pressure sensor parameter more than the second specified value?		 13 in H2O
5 in H2O		 Go to Step 7  Go to Step 12 
7
  1. Stop introducing nitrogen into the EVAP system with the remote switch.
  2. Increase the EVAP canister purge solenoid valve to 100 percent.
Is the fuel tank pressure sensor parameter less than the specified value?		 1 in H2O Go to Diagnostic Aids Go to Step 8 
8 Disconnect the EVAP purge pipe from the EVAP canister purge solenoid valve.
Is the fuel tank pressure sensor parameter less than the specified value?		 1 in H2O Go to Step 13  Go to Step 9 
9 Disconnect the EVAP purge pipe at the EVAP canister.
Is the fuel tank pressure sensor parameter less than the specified value?		 1 in H2O Go to Step 14  Go to Step 10 
10 Disconnect the EVAP vapor pipe at the EVAP canister.
Is the fuel tank pressure sensor parameter less than the specified value?		 1 in H2O Go to Step 15  Go to Step 11 
11 Repair the pinched or obstructed EVAP vapor pipe.
Did you complete the repair?		 - Go to Step 16  -
12 Replace the FTP sensor. Refer to Fuel Tank Pressure Sensor Replacement .
Did you complete the replacement?		 - Go to Step 16  -
13 Replace the EVAP canister purge solenoid valve. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement .
Did you complete the replacement?		 - Go to Step 16  -
14 Repair the restriction in the EVAP purge pipe. Refer to Evaporative Emission (EVAP) Hoses/Pipes Replacement - Chassis .
Did you complete the repair?		 - Go to Step 16  -
15 Replace the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement (TrailBlazer, EXT, Envoy XL, Envoy XUV) or Evaporative Emission (EVAP) Canister Replacement (TrailBlazer, Envoy, Bravada, Rainier) .
Did you complete the replacement?		 - Go to Step 16  -
16
IMPORTANT: DO NOT exceed the specified value in this step. Exceeding the specified value may produce incorrect test results.
  1. Connect the J 41413-200  to the fuel fill pipe.
  2. Turn the nitrogen/smoke valve to NITROGEN.
  3. Seal the EVAP system using the EVAP Purge/Seal function with a scan tool.
  4. Pressurize the EVAP system to the specified value.
  5. Observe the J 41413-200  pressure/vacuum gage for 5 minutes.
Does the J 41413-200  pressure/vacuum gage remain constant?		 5 in H2O Go to Step 17  Go to Step 3 
17 Observe the fuel tank pressure sensor parameter with a scan tool.
Is the scan tool fuel tank pressure parameter within the specified value of the J 41413-200  pressure/vacuum gage?		 1 in H2O Go to Step 18  Go to Step 5 
18
  1. Observe the J 41413-200  pressure/vacuum gage.
  2. Increase the EVAP canister purge solenoid valve to 100 percent.
Does the pressure decrease?		 - Go to Step 19  Go to Step 8 
19 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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