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Home >> Lexus >> 1994 >> ES 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - OBD-II >> Self-Diagnostic System >> Retrieving Trouble Codes >> Check Mode (Lexus Scan Tester Only)
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Check Mode (Lexus Scan Tester Only)

  1. Ensure battery voltage is greater than 11 volts. 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.
  2. Ensure ignition is off. Connect scan tester to Data Link Connector (DLC) No. 3 located in fuse block on lower left side of dash. See Figure. Turn ignition on with engine off. Turn scan tester on.
    NOTE: When scan tester is switched from Normal Mode to Check Mode, all trouble codes and freeze frame data will be erased. DO NOT switch modes until all trouble codes and freeze frame data are recorded.
  3. Switch scan tester from Normal Mode to Check Mode. Check Mode is operational if MIL on instrument cluster flashes. Start engine. Ensure MIL goes off. Try to simulate conditions of driveability complaint described by the customer.
  4. Record any trouble codes and freeze frame data displayed for system diagnosis. Freeze frame data records engine conditions when a misfire (Trouble Codes P0300-P0306), fuel trim malfunction (Trouble Codes P0171-P0172) or other malfunctions are detected.
  5. Freeze frame data such as fuel system conditions, engine coolant temperature, engine speed and vehicle speed etc. are recorded when malfunction exists. Information may be useful for determining conditions in which the malfunction occurs.
    NOTE: DO NOT turn ignition off until trouble codes and freeze frame data are recorded. If ignition is turned off, scan tester will switch from Check Mode to Normal Mode and all trouble codes and freeze frame data will be erased.
  6. For trouble code detecting conditions and trouble code identification, see TROUBLE CODE DETECTING CONDITIONS  and TROUBLE CODE IDENTIFICATION  tables.
  7. To repair failure causing trouble code, refer to appropriate code in TROUBLE CODE IDENTIFICATION  table. Once repairs for trouble code are made, trouble code must be cleared from ECM memory. See CLEARING TROUBLE CODES .
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