Inspection Procedure
Whenever the DTC diagnostics lead to a no trouble found or a purge solenoid
replacement, proceed with the following charcoal canister diagnostics.
Notice: Use the EVAP Pressure/Purge Diagnostic Station J 41413 in order
to provide a clean, dry, low pressure gas source. Do not substitute any other
pressurized gas source. Damage may result to the EVAP system.
The J 41413 is required to provide a clean, dry, low pressure
gas source. Do not substitute any other pressurized gas source or damage to
the EVAP system may result.
- Turn the ignition OFF.
- Remove the EVAP canister purge solenoid from the vehicle. Refer
to
Evaporative Emission Canister Purge Solenoid Valve Replacement
.
- Lightly tap the EVAP canister purge solenoid on a hard surface.
- Look for carbon particles exiting from either of the vacuum ports.
- If no carbon release is evident, reinstall the components. Continue
with the published service manual DTC procedures.
- If carbon is being released from either component, continue with
this service procedure.
- Remove the charcoal canister from the vehicle.
- Turn off the main cylinder valve (1) on the EVAP purge/pressure
diagnostic station J 41413.
- Disconnect the black hose (4) that connects the nitrogen
cylinder to the cart J 41413 at the pressure regulator (5).
- Using a section of the vacuum hose, connect one end to the open
fitting of the J 41413 pressure regulator (5).
- Connect the other end of the vacuum line side of the EVAP purge
line to the vehicle.
- Turn on the main nitrogen cylinder valve (1).
- Continue to blow any debris from the purge line for 15 seconds.
- Return the J 41413 to its original condition by re-installing
the black hose (4) disconnected in step 9.
- Replace the EVAP purge solenoid and the charcoal canister with
the new components.
- Connect the EVAP diagnostic cart J 41413 to the vehicle
EVAP service port. Turn the four position switch to Purge.
- Start the engine. Allow the engine to reach operating temperature.
- Open the throttle until the engine speed reaches 2000 RPM.
- Note the H2O vacuum gauge on the EVAP cart. The vacuum should
read greater than 15 in H2O.
- If the vacuum is less than 15 in H2O perform a complete
throttle body service including a cleaning of the purge port(s) as outlined
in the service manual. Go to step 1.
- If the vacuum is greater than 15 in H2O continue
with the published service manual diagnostics.