Toyota OBD1 Trouble Codes
The following trouble codes are specific to Toyota. You may also see Lexus trouble codes, since Toyota and Lexus are of the same parent company.
Toyota Trouble Codes Access
Without OBD Scan Tool
To extract trouble codes from the computer for diagnostic purposes, the Self Test connector is used. To access the trouble codes, proceed as follows:
- Turn off the engine and open the hood.
- Locate the diagnostic connector in the engine compartment of your Toyota. It is usually found under the passenger side dashboard or in the fender. The owner's manual for your Toyota will have a diagram.
- Attach the TE1 terminal to the E1 terminal with a jumper wire. Jumper wires are found at electronic stores and online.
- Turn the key in the ignition to start the engine.
- Watch and count the number of times the check engine light flashes. The light will flash in a pattern to indicate the two digit trouble code. For example, for code 14, the light will flash one time followed by a short pause and four more flashes.
Toyota Trouble Codes Clearance
All trouble codes must be cleared from the ECU’s memory after repairing the faults. Otherwise, code(s) would remain in the ECU’s memory indefinitely and would appear along with a new code in the event of a future problem. To clear the trouble codes, proceed as follows:
- Remove the EFI fuse (15A) for 30 seconds with the ignition switch OFF to clear any codes. It may take longer than 30 seconds, depending on ambient temperature (the lower the temperature, the longer the fuse must be left out).
- trouble codes can also be cleared by disconnecting the vehicle battery. However, other memory functions, e.g., clock, radio, will need to be reset.
- After the codes are cleared, road test the vehicle (as applicable for the fault) and check if any codes reset. If so, it indicates that the trouble area has not been repaired correctly.
Toyota Generic Trouble Codes
- Click the table header to sort the table data by the respective column heading.
- Type keyword(s) in the table’s search box for a quick display of the searched data.
| Code(s) | Description |
|---|---|
| 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 |