Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fail-Safe Chart
If any of the following codes are recorded, the ECM enters the fail-safe mode.
| DTC | Item | Fall-safe Operation | Fail-safe Deactivation Conditions |
|---|---|---|---|
| P0031, P0032, P0038, P0051, P0052, P0057 and P0058 | Heated Oxygen Sensor Heater | Turn off heated oxygen sensor heater. | Ignition switch OFF |
| P0100, P0102 and P0103 | MAF Meter | The ignition timing is calculated from engine RPM and throttle position. | "Pass" condition detected |
| P0110, P0112 and P0113 | IAT Sensor | The ECM detects that IAT is 20°C (68°F). | "Pass" condition detected |
| P0115, P0117 and P0118 | ECT Sensor | The ECM detects that ECT is 80°C(176°F). | "Pass" condition detected |
| P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P0607, P0657, P2102, P2103, P2111, P2112, P2118, P2119 and P2135 | Electronic Throttle Control System (ETCS) | The ECM cuts off the throttle actuator current and the throttle valve returns to 7° TP by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel cut) and ignition timing in accordance with the accelerator pedal opening angle to continue at a minimal speed*. |
"Pass" condition is detected and then the ignition switch is turned OFF. |
| P0327, P0328, P0332 and P0333 | Knock Sensor | The ECM sets the ignition timing to the maximum retard position. | Ignition switch OFF. |
| P0351 to P0358 | Igniter | Fuel cut | "Pass" condition detected. |
| P2120, P2121, P2122, P2123, P2125, P2127, P2128 and P2138 | Accelerator Pedal Position Sensor | The accelerator pedal position sensor has 2 sensor elements (main and sub). If either of the elements malfunctions, the ECM controls the engine with other elements. If both of the elements malfunction, the ECM detects that the accelerator pedal position is fully closed. The engine can be run at idle (in this case, the throttle valve will remain closed as if the engine is idling). |
"Pass" condition is detected and the ignition switch is turned OFF |
| HINT: *: The vehicle can be driven slowly when the accelerator pedal is depressed firmly and slowly. If the accelerator pedal is depressed quickly, the vehicle may speed up and slow down erratically. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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