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Normal Mode

  1. Before retrieving trouble code(s), verify MIL on instrument panel light comes on with ignition on and engine off. The MIL light should go off when engine is started.
  2. On all models except Corolla and Supra, if MIL does not come on, see appropriate DIAGNOSTIC CIRCUIT CHECK chart under TROUBLE CODE CHARTS.
  3. On Corolla and Supra, check bulb circuit on instrument panel and wiring circuit between MIL and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. On Corolla, ECM is located bottom center of dash, in front of console. On Supra, ECM is located below passenger's side of dash underneath the carpet.
  4. On all models, if MIL remains on, self-diagnostic system has detected a malfunction or abnormality. Ensure battery voltage is greater than 11 volts and charging system is okay. Warm engine to normal operating temperature.
  5. Apply parking brake. Shift transmission/transaxle into Neutral(M/T) or Park (A/T). Turn A/C and all accessories off. Ensure throttle is in idle position.
  6. Turn ignition on with engine off. Install Jumper Wire (SST 09843-18020) between terminals "T" (Tercel) or TE1 (all others) and E1 in Data Link Connector (DLC). See Figure.
    NOTE: Data link connector may be referred to as DLC. Data link connector No. 1 is used on all models except Camry and Supra. On Camry and Supra data link connector No. 2 is used. See Figure.
  7. Count number of flashes from MIL on instrument panel. If system is operating properly (with no trouble codes), MIL will flash continuously and evenly. See Figure.
    NOTE: If MIL will not flash, check "T" (Tercel) or TE1 (all others) and E1 wiring circuit. See appropriate DIAGNOSTIC CIRCUIT CHECK chart under TROUBLE CODE CHARTS.
  8. If trouble code exists, digits of trouble code will be flashed at approximately 1/2-second intervals. A 1 1/2-second pause separates first and second digits of code. See Figure.
  9. If more than one trouble code is stored, a 2 1/2-second pause will occur before next trouble code is flashed. Once all trouble codes are displayed, a 4 1/2-second pause will occur then trouble code(s) will be repeated.
  10. Trouble codes are displayed in order of smallest to largest. After trouble codes are retrieved, remove jumper wire to exit Normal Mode. See NOTES ON TROUBLE CODES . For additional information on trouble codes, see TROUBLE CODE DIAGNOSTIC HINTS  table under SELF-DIAGNOSTIC SYSTEM and appropriate table under TROUBLE CODE IDENTIFICATION .
NOTE: To repair failure causing trouble code, refer to proper trouble code chart under TROUBLE CODE CHARTS. Once repairs for trouble code are made, trouble code must be cleared from ECM memory. See CLEARING TROUBLE CODES .
NOTE: Test Mode is not available on Celica 1.6L 4A-FE, Paseo, Pickup 2.4L, Previa, Tercel & 4Runner 2.4L
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