Toyota Read Check Engine Codes without OBD2 Scanner

1. Park vehicle and set the emergency brakes. 

    

2. Turn key to position II. All dash lights should be ON. Do not start the engine. 

    

3. Pull the hood release and open the hood. 

    

4. Locate the diagnostic port in the engine bay. This is known as Diagnosis Connector 1 or DLC1. 

    

5. Use a copper wire or paper clip to short terminals TE1 and E1.
6. Go back inside 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 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.