If any of the following DTCs are set, the ECM enters fail-safe mode to allow the vehicle to be driven temporarily.
| DTC Code | Component | Fail-Safe Operation | Fail-Safe Deactivation Condition |
|---|---|---|---|
| P0031 and P0032 | Air Fuel Ratio (A/F) Sensor Heater | ECM turns off A/F sensor heater. | Ignition switch off |
| P0037 and P0038 | Heated Oxygen (HO2) Sensor Heater | ECM turns off HO2 sensor heater. | Ignition switch off |
| P0105, P0107 and P0108 | Manifold absolute pressure sensor (MAP) | ECM calculates ignition timing according to engine speed and throttle valve position. | Pass condition detected |
| P0112 and P0113 | Intake Air Temperature (IAT) Sensor | ECM estimates IAT to be 20°C (68°F). | Pass condition detected |
| P0115, P0117 and P0118 | Engine Coolant Temperature (ECT) Sensor | ECM estimates ECT to be 80°C (176°F). | Pass condition detected |
| P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P0657, P2102, P2103, P2118, P2119 and P2135 | Electronic Throttle Control System (ETCS) | ECM cuts off throttle actuator current and throttle valve is returned to 6.5° throttle position by return spring. ECM then adjusts engine output by controlling fuel injection (intermittent fuel-cut) and ignition timing in accordance with accelerator pedal opening angle to allow vehicle to continue at minimal speed*. |
Pass condition detected and then ignition switch turned off |
| P0401 | Exhaust Gas Recirculation Flow | ECM assumes that EGR valve is closed, so that ignition angle is controlled with safety valve | Pass condition detected |
| P0403 | Exhaust Gas Recirculation Control Circuit | ECM assumes that EGR valve is closed, so that ignition angle is controlled with safety valve | Pass condition detected |
| P0327 and P0328 | Knock Sensor | ECM sets ignition timing to maximum retard. | Ignition switch off |
| P0351, P0352 and P0353 | Igniter | ECM cuts fuel. | Pass condition detected |
| P2120, P2121, P2122, P2123, P2125, P2127, P2128 and P2138 | Accelerator Pedal Position (APP) Sensor | APP sensor has 2 sensor circuits: Main and Sub. If either circuit malfunctions, ECM controls engine using the other circuit. If both circuits malfunction, ECM regards accelerator pedal as being released. As a result, throttle valve is closed and engine idles. |
Pass condition detected and then ignition switch turned off |
| P2237, P2238, P2239, P2252 and P2253 | Air Fuel Ratio (A/F) Sensor | Air fuel ratio feedback control is stopped | Pass condition detected and then ignition switch turned off |
Note
*: 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.