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.
- Park the vehicle and set the emergency brakes.
- Turn key to position II. All dash lights should be ON. Do not start the engine.
- Pull the hood release and open the hood.
- Locate the diagnostic port in the engine bay. This is known as Diagnosis Connector 1 or DLC1.
- Use a copper wire or paper clip to short terminals TE1 and E1.
- 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.