- Air fuel ratio feedback control is stopped.
- Current to the air fuel ratio sensor heater is cut.
Lexus NX: Fail-safe Chart
Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Control) / Sfi System / Fail-safe Chart
FAIL-SAFE CHART
If any of the following DTCs are stored, the ECM enters fail-safe mode to allow the vehicle to be driven temporarily or stops fuel injection.
| DTC Code | Component | Fail-Safe Operation | Fail-Safe Deactivation Condition |
|---|---|---|---|
| P0031 P0032 P101D | Air fuel ratio sensor heater | The ECM turns off the air fuel ratio sensor heater. | Power switch off |
| P0037 P0038 P102D | Heated oxygen sensor heater | The ECM turns off the heated oxygen sensor heater. | Power switch off |
| P0102 P0103 | Mass air flow meter sub-assembly | The ECM calculates ignition timing according to the engine speed and throttle valve position. | Pass condition detected |
| P0106 P0107 P0108 | Manifold absolute pressure sensor | The ECM turns off EGR valve operate. | Pass condition detected |
| P0112 P0113 | Intake air temperature sensor | The ECM estimates the intake air temperature to be 20°C (68°F). | Pass condition detected |
| P0115 P0117 P0118 | Engine coolant temperature sensor | The ECM estimates the engine coolant temperature to be 80°C (176°F). | Pass condition detected |
| P0120 P0121 P0122 P0123 P0220 P0222 P0223 P0604 P0606 P060A P060B P060E P0657 P2102 P2103 P2111 P2112 P2118 P2119 P2135 | Electronic throttle control system | The ECM cuts off throttle actuator current and the throttle valve is returned to a 5.5° throttle position by the return spring. The ECM stops the engine and the vehicle can be driven using solely the hybrid system.* | Pass condition detected and then power switch turned off |
| P0327 P0328 | Knock control sensor | The ECM sets the ignition timing to maximum retard. | Power switch off |
| P0351 P0352 P0353 P0354 | Ignition coil assembly | The ECM cuts the fuel injection. | Pass condition detected |
| P0401 P0403 | EGR valve assembly | ECM assumes that EGR valve assembly is closed, so that ignition timing controlled to a safe valve. | Pass condition detected and then power switch turned off |
| P2237 P2238 P2239 P2252 P2253 | Air fuel ratio sensor | | 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.
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