Toyota Trouble Code Info

  • Before proceeding, make sure the:
    • CHECK ENGINE light circuit is functional. It should be ON when the ignition switch is ON with the engine stopped.
    • Battery voltage is above 11 volts.
    • Throttle valve is fully closed (Throttle Position Sensor IDL points closed).
    • Accessory switches (A/C, etc.) are OFF.
    • Engine is at normal operating temperature (if possible).
  • Turn ignition switch to ON position.
    • Do not start the engine.
    • Place a jumper wire across TEl and El terminals in engine check connector.
  • Count number of flashes from CHECK ENGINE light.
    • If system is operating normally (with no detected faults), the CHECK ENGINE light will blink continuously
      and evenly about 2 times a second.
  • Otherwise, the light will blink a number of times equal to the trouble code as follows:
    • The light blinks only (.5 second ON, .5 second OFF) when indicating a number.
    • The light will be OFF for 1.5 seconds between the first digit and the second digit of the code.
    • If more than one code is stored, the light will be OFF for 2.5 seconds before the next code is displayed.
    • Once all code(s) have been displayed, the light will be OFF for 4.5 seconds and then the whole sequence will repeat.
  • The diagnostic code series will continue to repeat as long as the check connecter terminals TEl and El are connected.
  • When finished, remove the jumper wire.
  • After repairing the malfunction, clear the codes from the ECUs memory.

    Clearing Trouble Codes

    All trouble codes must be purged from the ECUs memory after repairing the faults. Otherwise, code(s) would remain in the ECUs memory indefinitely and would appear along with a new code in the event of a future problem.

  • 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 (clock, radio, etc.), will need to be reset.
  • After the codes are cleared, road test the vehicle (as applicable for the fault) and recheck if any codes reset. If so, it indicates that the trouble area has not been repaired correctly.

Trouble Codes

OBD1 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.
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.


TCM Communication.
84 TCM Communication.
85 TCM Communication.


P0100 Mass Air Flow Circuit.
P0101 Mass Air Flow Circuit Range/Performance.
P0105 Manifold Absolute Pressure Circuit.
P0106 MAP/BARO Circuit Range/Performance.
P0110 Intake Air Temperature Circuit.
P0115 Engine Coolant Temperature Circuit.
P0116 Engine Coolant Temperature Range/Performance.
P0120 Throttle Pedal Sensor Switch "A" Circuit.
P0121 Throttle Pedal Sensor Switch "A" Circuit Range/Performance.
P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control.
P0130 Heated Oxygen Sensor Circuit - Bank 1 Sensor 1.
P0133 Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1.
P0135 Heated Oxygen Sensor Circuit - Bank 1 Sensor 1.
P0136 Heated Oxygen Sensor Circuit - Bank 1 Sensor 2.
P0141 Heated Oxygen Sensor Circuit - Bank 1 Sensor 2.
P0150 Heated Oxygen Sensor Circuit - Bank 2 Sensor 1.
P0153 Heated Oxygen Sensor Circuit Slow Response Bank 2 Sensor 1.
P0155 Heated Oxygen Sensor Circuit - Bank 2 Sensor 1.
P0156 Heated Oxygen Sensor Circuit - Bank 2 Sensor 2.
P0161 Heated Oxygen Sensor Circuit - Bank 2 Sensor 2.
P0170 Fuel Trim malfunction.
P0171 System too Lean.
P0172 System too Rich.
P0201 Injector Circuit - Cyl. 1.
P0202 Injector Circuit - Cyl. 2.
P0203 Injector Circuit - Cyl. 3.
P0204 Injector Circuit - Cyl. 4.
P0205 Injector Circuit - Cyl. 5.
P0206 Injector Circuit - Cyl. 6.
P0300 Random Misfire.
P0301 Misfire Detected - Cyl. 1.
P0302 Misfire Detected - Cyl. 2.
P0303 Misfire Detected - Cyl. 3.
P0304 Misfire Detected - Cyl. 4.
P0305 Misfire Detected - Cyl. 5.
P0306 Misfire Detected - Cyl. 6.
P0325 Knock Sensor 1 Circuit.
P0330 Knock Sensor 2 Circuit.
P0335 Crankshaft Position Sensor "A" Circuit.
P0336 Crankshaft Position Sensor "A" Circuit Range/Performance.
P0340 CMP Sensor Circuit malfunction.
P0385 Crankshaft Position Sensor "B" NE2 Circuit.
P0401 EGR Flow Insufficient.
P0402 EGR Flow Excessive.
P0420 Catalyst System Efficiency below Threshold.
P0430 Catalyst System Efficiency below Threshold Bank 2.
P0440 EVAP Control System.
P0441 EVAP Control System Improper Purge Flow.
P0446 EVAP Control System Vent Control.
P0450 EVAP Control System Pressure Sensor.
P0451 EVAP Control System Pressure Sensor Range/Performance.
P0500 Vehicle Speed Sensor.
P0505 Idle Speed Control System.
P0510 Close Throttle Position Switch.
P1100 BARO Sensor Circuit.
P1120 Accelerator Pedal Position Sensor Circuit.
P1121 Accelerator Pedal Position Sensor Range/Performance Problem.
P1125 Throttle Control Motor Circuit.
P1126 Magnetic Clutch Circuit.
P1127 ETCS Actuator Power Source Circuit.
P1128 Throttle Control Motor Lock.
P1129 Electric Throttle Control System.
P1130 Air-Fuel Sensor Circuit Range/Performance.
P1133 Air-Fuel Sensor Circuit Response.
P1135 Air-Fuel Sensor Heater Circuit Response.
P1150 A/F Sensor Circuit Range/Performance.
P1153 A/F Sensor Circuit Response.
P1155 A/F Sensor Heater Circuit.
P1200 Fuel Pump Relay Circuit.
P1300 Igniter Circuit - No. 1.
P1310 Igniter Circuit - No. 2.
P1335 No Crankshaft Position Sensor Signal - Engine Running.
P1349 VVT System.
P1400 Sub-Throttle Position Sensor.
P1401 Sub-Throttle Position Sensor Range/Performance Problem.
P1405 Turbo Pressure Sensor Circuit.
P1406 Turbo Pressure Sensor Range/Performance Problem.
P1410 EGR Valve Position Sensor Circuit.
P1411 EGR Valve Position Sensor Circuit Range/Performance.
P1500 Starter Signal Circuit.
P1510 Boost Pressure Control Circuit.
P1511 Boost Pressure Low.
P1512 Boost Pressure High.
P1520 Stop Lamp Switch Signal.
P1565 Cruise Control Main Switch Circuit.
P1600 ECM.
P1605 Knock Control CPU.
P1630 Traction Control System.
P1633 ECM.
P1652 Idle Air Control Valve Control Circuit.
P1656 OCV Circuit.
P1658 Wastegate Valve Control Circuit.
P1661 EGR Circuit.
P1662 EGR by-pass Valve Control Circuit.
P1780 Park/Neutral Switch.

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