GSIC - Global Service Information Center

# SFI SYSTEM > FAIL-SAFE CHART

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If any of the following codes are recorded, the ECM enters the fail-safe mode.

DTCs | Components | Fail-safe Operation | Fail-safe Deactivation Condition
P0031, P0032, P0051 and P0052 | Air-fuel Ratio (A/F) Sensor Heater | ECM turns off A/F sensor heater. | Ignition switch OFF
P0037, P0038, P0057 and P0058 | Heated Oxygen Sensor Heater | ECM turns off heated oxygen sensor heater. | Ignition switch OFF
P0100, P0102 and P0103 | Mass Air Flow (MAF) Meter | ECM calculates ignition timing according to engine speed and throttle valve position. | Pass condition detected
P0110, 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, P0122, P0123, P0220, P0222, P0223, P2102, P2103, P2111, P2112, P2118, P2119, and P2135

Electronic Throttle Control System (ETCS)

ECM cuts off throttle actuator current and throttle valve returns to 6°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

P0327, P0328, P0332 and P0333 | Knock Sensor | ECM sets ignition timing to maximum retard. | Ignition switch OFF
P0351 to P0356 | Igniter | ECM cuts fuel. | Pass condition detected

P2120, P2121, P2122, P2123, P2125, P2127, P2128 and P2138

Accelerator Pedal Position Sensor

Accelerator pedal position sensor has 2 sensor circuits: Main and Sub.
If either of circuits malfunctions, ECM controls engine using other circuit.
If both of 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

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.