Toyota Celica 1994-1998 Repair Guide

Evaporative Canister

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SERVICING



See Figures 1, 2, 3, and 4

The canister cycles the fuel vapor from the fuel tank. The activated charcoal element within the canister acts as a storage device for the fuel vapors at times when the engine operating conditions do not allow efficient burning of the vapors.

The only required service for the canister is inspection at the intervals specified in the Maintenance Chart at the end of this section. If the charcoal element is saturated, the entire canister will require replacement. Label and disconnect the canister purge hoses, loosen the retaining bracket bolt(s) and lift out the canister. Installation is simply the reverse of the removal process. To check the canister:

  1. Label and remove the vacuum lines leading to the canister.
  2.  
  3. Unfasten the retaining bolts from the canister.
  4.  
  5. Pull the lower hose off the tube attached to the lower portion of the canister.
  6.  
  7. Inspect the case for any cracking or damage.
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Fig. Fig. 1: Inspect the evaporative canister in these locations for cracks or damage

  1. Using low pressure compressed air, blow into the tank pipe (flanged end) and check that air flows freely from the other ports.
  2.  



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Fig. Fig. 2: Blow low pressure air into the tank pipe end and check for free air flow from the other ports

  1. Blow into the purge pipe (next to tank pipe) and check that air does not flow from the other ports. If air does flow, the check valve has failed and the canister must be replaced.
  2.  



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Fig. Fig. 3: As you blow air into the purge pie, limited air flow should come from the other ports

  1. Never attempt to clean the canister with fluid or solvent. Low pressure air 43 psi (294 kPa) maximum may be used to evaporate any vapors within the canister. When applying the air, hold a finger over the purge pipe to force all the air out the bottom port.
  2.  



Click image to see an enlarged view

Fig. Fig. 4: To clean the filter, place your finger on the purge pipe, then apply air into the tank pipe

  1. No carbon should come out of the filter at any time. Loose charcoal is a sign of internal failure in the canister.
  2.  

 
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