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Home >> Toyota >> 1995 >> Corolla Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 1.6L >> Introduction >> Retrieving Trouble Codes >> Test Mode
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Test Mode

  1. Before retrieving trouble code(s), verify MIL on instrument panel illuminates with ignition on and engine off. The MIL should go off when engine is started.
  2. Ensure battery voltage is greater than 11 volts and charging system is okay. Apply parking brake. Shift the transmission/transaxle to Neutral (M/T) or Park (A/T). Turn A/C and all accessories off. Ensure throttle is in idle position and ignition is off.
    NOTE: Test Mode will not operate if jumper wire is installed between terminals TE2 and E1 in Data Link Connector (DLC) after ignition is turned on.
  3. Install a jumper wire between terminals TE2 and E1 in Data Link Connector (DLC) with ignition off. See Figure for DLC terminal illustration.
    NOTE: DLC No. 1 is used. See Figure for DLC location.
  4. Turn ignition on with engine off. Test Mode is operational if MIL on instrument panel flashes. If MIL fails to flash, check TE2 wiring circuit. See wiring diagram in WIRING DIAGRAMS - 1.6L article.
  5. Drive vehicle at a speed greater than 6 MPH. ECM will set Codes 42 and 43 if vehicle is not driven. Try to simulate conditions of driveability complaint described by customer, and note when MIL comes on. This indicates when problem exists.
  6. Stop vehicle, but DO NOT turn engine off. Install jumper wire between terminals TE1 and E1 in DLC. 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.
  7. 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.
  8. 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. Trouble codes are displayed in order of smallest to largest number.
    NOTE: Trouble Code 51 will normally be displayed if automatic transmission/transaxle is in any gear except Park or Neutral, A/C is turned on, or accelerator pedal is depressed.
  9. After trouble code(s) is retrieved, remove jumper wires to exit Test Mode. To repair failure causing trouble code, refer to DIAGNOSTIC TESTING . Once repairs for trouble code are made, trouble code must be cleared from ECM memory. See CLEARING TROUBLE CODES.
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