Fail-Safe Chart

WARNING: This page is about a different car, the 2010 Lexus GS 450h. However, it is still accessible from the selected car via links, so may be relevant.

If any of the following DTCs are set, the ECM enters fail-safe mode to allow the vehicle to be driven temporarily.

DTC	Component	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	Power switch OFF
P0037, P0038, P0057 and P0058	Heated Oxygen Sensor (HO2S) Heater	ECM turns off HO2 sensor heater	Power switch OFF
P0087, P0088	Fuel Pump (for High Pressure)	Stop the fuel pump for high pressure Limit the engine speed to 2000 RPM or less	Pass condition detected
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, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P0607, P0657, 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 power switch turned OFF
P0171, P0172, P0174, P0175	Fuel trim	Air-fuel ratio feedback control is stopped	Pass condition detected and then power switch turned OFF
P0190, P0192, P0193	Fuel Pressure Sensor	Stop the fuel pump for high pressure Limit the engine speed to 2000 RPM or less	Pass condition detected and then power switch turned OFF
P0200	Injector Driver (EDU)	Current to the INJ relay is cut	Pass condition detected
P0200, P0201, P0202, P0203, P0204, P0205, P0206	Injector Driver (EDU)	Stop fuel injection for an abnormal cylinder and related other cylinders Limit the engine speed to 2000 RPM or less	Pass condition detected and then power switch turned OFF
P0327, P0328, P0332 and P0333	Knock Sensor	ECM sets ignition timing to maximum retard.	Power switch OFF
P0351 to P0356	Ignition Coil	ECM cuts fuel	Pass condition detected
P1235	Fuel Pump (for High Pressure) (spill control valve)	Stop the fuel pump for high pressure Limit the engine speed to 2000 RPM or less	Pass condition detected
P1276, P1277, P1278, P1279, P127A, P127B	Fuel injector (for port injection)	Limit the engine speed to 2000 RPM or less Fuel cut of malfunction cylinder	Pass condition detected and then power switch turned OFF
P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255, P2256	A/F sensor	Air-fuel ratio feedback control is stopped	Pass condition detected and then power 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.