2006 Lexus IS 350FACTORY OEM SERVICE PROCEDURE

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.

FAIL-SAFE CHART

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 Fuel Pump for High Pressure
  • Stop the fuel pump for high pressure
  • 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(1). Pass condition detected and then engine switch turned off
P0171, P0172, P0174, 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 fuel pump for high pressure
  • 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 Driver (EDU)
  • 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
P0327, P0328, 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
P1235 Fuel Pump for High Pressure Side (spill valve)
  • Stop the fuel pump for high pressure
  • Limit the engine speed to 2,000 rpm or less
 Pass condition detected
P1276, P1277, P1278, P1279, P127A, P127B Fuel injector for port injection
  • Limit the engine speed to 2,000 rpm or less
  • Fuel cut of malfunction cylinder
 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
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 the circuits malfunctions, ECM controls engine using the other circuit. If both of the circuits 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
(1) 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.
Factory Service Tools

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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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