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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 128 (REMOTE KEYLESS ENTRY SYSTEMS)SELF-DIAGNOSTIC SYSTEMPRE-CHECK
2004 Toyota Celica GT, Standard

Self-Diagnostic System: Pre-Check

2004 Toyota Celica GT, StandardSECTION Pre-Check
WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: The hand-held tester has a Snapshot function which records the monitored data. Please refer to the hand-held tester operator's manual for further details.
  1. Using the hand-held tester:
    • Hook up the hand-held tester to the DLC3.
    • Monitor the ECU data by following the prompts on the tester screen.
  2. DTC Clear:
    • The DTCs and freeze framed data will be erased by either action. Operate the OBD II scan tool (complying with SAE J1978) or hand-held tester erase the codes. See the OBD II scan tool's instruction book for operating instructions.
    3. NOTE: According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal.
  3. Data List:
    • Connect the OBD II scan tool or hand-held tester to the DLC3.
    • Turn the ignition switch ON.
    • According to the display on tester, read the DATA LIST. See DATA LIST: BODY ECU  table.
      DATA LIST: BODY ECU

      Item Inspecting Condition Standard Value
      KEY SW IG ON - Without Key ON To OFF
    4. NOTE: Performing the ACTIVE TEST using the OBD II scan tool or hand-held tester allows the relay, VSV, actuator and so on to operate without parts removal.
  4. Active Test:
    • Connect the OBD II scan tool or hand-held tester to the DLC3.
    • Turn the ignition switch ON.
    • According to the display on the tester, perform the ACTIVE TEST. See ACTIVE TEST  table.
      ACTIVE TEST

      Item Motor
      Wireless Buzzer ON/OFF
RENDER: 1.0x

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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.