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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 108 (ENGINE CONTROL SYSTEM SELF DIAGNOSTICS)SELF-DIAGNOSTIC SYSTEMBASIC INSPECTION
2004 Toyota Celica GT, Standard

Basic Inspection

2004 Toyota Celica GT, StandardSECTION Basic Inspection
WARNING: This page is about a different car, the 2003 Toyota Matrix and 2003 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

When malfunction code is not confirmed in DTC check, trouble shooting should be carried out in order for all possible circuits to be considered as causes of problems. In many cases, by carrying out basic engine check shown in following flow chart, location causing problem can be found quickly and efficiently. Therefore, use of this check is essential in engine trouble shooting.

  1. Check battery voltage. Carry out this check under engine stoppage condition. If voltage is 11 V or more, go to next step. If voltage is less than 11 V, charge or replace battery.
  2. Check if engine is cranked. If engine cranks, go to next step. If engine cranks, go to TROUBLE SHOOTING - NO CODES article.
  3. Check if engine starts. If engine starts, go to next step. If engine does not start, go to step  7.
  4. Visually check that air filter is not excessively dirty or oily. If necessary, clean filter with compressed air. First blow from inside thoroughly, then blow from outside of filter. If air filter is OK, go to next step. If filter is not good, repair or replace.
  5. Check idle speed. See ON-VEHICLE ADJUSTMENTS - 4-CYLINDER article. If results are OK, go to next step. If results are not good, go to TROUBLE SHOOTING - NO CODES article.
  6. Check ignition timing. See ON-VEHICLE ADJUSTMENTS - 4-CYLINDER article. If results are OK, go to TROUBLE SHOOTING - NO CODES article. If results are not good, go to TROUBLE SHOOTING - NO CODES article and continue to trouble shoot.
  7. Check fuel pressure. See BASIC DIAGNOSTIC PROCEDURES - 4-CYL article. If results are OK, go to next step. If results are not good, go to TROUBLE SHOOTING - NO CODES article and continue to trouble shoot.
  8. Check for a spark. See BASIC DIAGNOSTIC PROCEDURES - 4-CYL article. If results are OK, TROUBLE SHOOTING - NO CODES article. If results are not good, go to TROUBLE SHOOTING - NO CODES article and continue to trouble shoot.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.