reading codes without OBD2 scanner on Toyota

Toyota Read Check Engine Codes without the OBD2 Scanner

You can read the fault codes on Toyota vehicles equipped with OBD-I without a diagnostic tool. Unfortunately, this procedure only works on 1995 and older Toyota vehicles if you need to read codes on a newer Toyota, see how to read Toyota OBD-II fault codes.


The YOUCANIC Full System Scanner can read and clear fault codes through every vehicle’s control module.

  1. Park the vehicle and set the emergency brakes. Park Toyota read fault codes
  2. Turn key to position II. All dash lights should be ON. Do not start the engine. Turn on igntion to read Toyota check engine codes without a scanner
  3. Pull the hood release and open the hood. Open hood to locate diagnositc port and read toyota engine codes without a scanner
  4. Locate the diagnostic port in the engine bay. This is known as Diagnosis Connector 1 or DLC1. Port used to read Toyota codes without a scanner
  5. Use a copper wire or paper clip to short terminals TE1 and E1.
  6. Return to the car and count the number of flashes for the check engine light.

This procedure will not work on Toyota vehicles equipped with OBD-II. For most 2000 and newer vehicles, you will need a code reader to read and check engine fault codes.

OBD-I Codes

  • 1    Normal Condition.
  • 2    Air Flow Meter signal.
  • 3    Ignition signal.
  • 4    Engine Coolant Temperature Sensor signal.
  • 5    Oxygen Sensor.
  • 6    RPM signal (Crank Angle Pulse).
  • 7    Throttle Position Sensor signal.
  • 8    Intake Air Temperature Sensor signal.
  • 9    Vehicle Speed Sensor signal.
  • 10    Starter signal.
  • 11    Switch signal.
  • 11    ECU/ECM.
  • 12    Knock Control Sensor signal.
  • 12    RPM signal.
  • 13    Knock Control CPU (ECM).
  • 13    RPM signal.
  • 14    Turbocharger Pressure.
  • 14    Ignition signal.
  • 21    Oxygen Sensor.
  • 22    Engine Coolant Temperature Sensor signal.
  • 23    Intake Air Temperature Sensor signal.
  • 24    Intake Air Temperature Sensor signal.
  • 25    Air-Fuel Ratio Lean.
  • 26    Air-Fuel Ratio Rich.
  • 27    Sub Oxygen Sensor signal.
  • 28    No. 2 Oxygen Sensor signal.
  • 31    Air Flow Meter signal (Vacuum Sensor signal).
  • 32    Air Flow Meter signal.
  • 34    Turbocharger Pressure signal.
  • 35    Turbocharger Pressure Sensor signal.
  • 35    HAC Sensor signal.
  • 41    Throttle Position Sensor signal.
  • 42    Vehicle Speed Sensor signal.
  • 43    Starter signal.
  • 51    Switch signal.
  • 52    Knock Sensor signal.
  • 53    Knock Sensor signal.
  • 54    Inter-cooler ECM signal.
  • 71    EGR System.
  • 72    Fuel Cut Solenoid signal.
  • 78    Fuel Pump Control signal.
  • 81    TCM Communication.
  • 83    TCM Communication.
  • 84    TCM Communication.
  • 85    TCM Communication.

We hope you find the Toyota Read Check Engine Codes without the OBD2 Scanner guide helpful. If you need a good OBD2 scanner, check out the YOUCANIC full system scanner, which can read and clear codes on Toyota and all other makes.


  • Rushit Hila • ASE Certified

    Rushit Hila, an ASE-certified engineer (G1 Automotive Maintenance and Repair), brings over two decades of hands-on experience in the automotive world to his writing. With a strong educational background, including a Master of Science in Engineering and a Bachelor of Science in Engineering, he has honed his skills and expertise through years of practical work. As a respected authority in the field, Mr. Hila is dedicated to offering insightful and valuable content that resonates with both vehicle owners and mechanics.

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