Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM
SFI SYSTEM - FAIL-SAFE CHART
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 | Engine switch off |
| P0037, P0038, P0057 and P0058 | Heated Oxygen Sensor (HO2S) Heater | ECM turns off HO2 sensor heater | Engine switch off |
| P0087, P0088 | High Pressure Side Fuel Pump | Stop the high pressure side fuel pump Limit the engine speed to 2,000 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 6.5° 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 engine switch turned off |
| P0171, P0172, P0174 and P0175 | Fuel trim | Air-fuel ratio feedback control is stopped | Pass condition detected and then engine switch turned off |
| P0190, P0192, P0193 | Fuel pressure sensor | Stop the high side fuel pump Limit the engine speed to 2,000 rpm or less | Pass condition detected and then engine switch turned off |
| P0200, P0201, P0202, P0203, P0204, P0205, P0206, P12FF | Injector | Stop fuel injection for an abnormal cylinder and related other cylinders Limit the engine speed to 3,000 rpm or less | Pass condition detected and then engine switch turned off |
| P0325, P0327, P0328, P0330, P0332 and P0333 | Knock Sensor | ECM sets ignition timing to maximum retard. | Engine switch off |
| P0351 to P0356 | Ignition Coil | ECM cuts fuel | Pass condition detected |
| P0504 | Stop light switch | Accelerator pedal angle is fixed | Pass condition detected |
| P0516, P0517 | Battery thermometer sensor | Generator duty ratio is fixed | Pass condition detected and then engine switch turned off |
| P1235 | High Pressure Side Fuel Pump (spill valve) | Stop the high side fuel pump Limit the engine speed to 2,000 rpm or less | Pass condition detected |
| P1550, P1551, P1552 | Battery current sensor | Generator duty ratio is fixed | Pass condition detected and then engine switch turned off |
| P1602 | Battery | Generator duty ratio is fixed | Pass condition detected and then engine switch turned off |
| 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 of circuit malfunctions, ECM controls engine using other circuit. If both of circuit malfunction, ECM regards accelerator pedal as being released. As a result, throttle valve is closed and engine idles. | Pass condition detected and then engine switch turned off |
| P2238, P2239, P2241, P2242, P2252, P2253, P2255, P2256 | A/F sensor | Air-fuel ratio feedback control is stopped | Pass condition detected and then engine switch turned off |
- NOTICE:
- *: 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.
LEXUS IS250, IS220d / GSE20 ALE20