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Home >> Lexus >> 2021 >> RX 450h Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics - Introduction) (1 Of 5) >> SFI System >> Fail-Safe Chart [10/2015 - 07/2020] >> Fail-Safe Chart [10/2015 - 07/2020]

Fail-Safe Chart [10/2015 - 07/2020]

If any of the following DTCs are stored, the ECM assembly 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
P0051
P0052
P101D
P103D
Air fuel ratio sensor heater The ECM assembly turns off the air fuel ratio sensor heater. Power switch off
P0037
P0038
P0057
P0058
P102D
P105D
Heated oxygen sensor heater The ECM assembly turns off the heated oxygen sensor heater. Power switch off
P0087
P0088
Fuel pump assembly (for high pressure side)
  • Stop the fuel pump assembly (for high pressure side).
  • Limit the engine speed to 2000 rpm or less.
Pass condition detected
P0102
P0103
Mass air flow meter sub-assembly The ECM assembly calculates ignition timing according to the engine speed and throttle valve position. Pass condition detected
P0106
P0107
P0108
Manifold absolute pressure sensor The ECM assembly turns off EGR valve operate. Pass condition detected
P0112
P0113
Intake air temperature sensor The ECM assembly estimates the intake air temperature to be 20°C (68°F). Pass condition detected
P0115
P0117
P0118
Engine coolant temperature sensor The ECM assembly 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 assembly cuts off throttle actuator current and the throttle valve is returned to a 7° throttle position by the return spring.
The ECM assembly stops the engine and the vehicle can be driven using solely the hybrid system.*
Pass condition detected and then power switch turned off
P0192
P0193
P1235
Fuel pressure sensor
  • Stop the fuel pump assembly (for high pressure side).
  • Limit the engine speed to 2000 rpm or less.
  • Fuel pressure is set to 200 kPa.
Pass condition detected and then power switch turned off
P0201
P0202
P0203
P0204
P0205
P0206
P062D
Injector driver (EDU)
  • The ECM assembly performs fuel-cut when the engine speed is 1000 rpm or more.
  • Stop fuel injection for an abnormal cylinder and related other cylinders.
Pass condition detected and then power switch turned off
P0327
P0328
P0332
P0333
Knock control sensor The ECM assembly sets the ignition timing to maximum retard. Power switch off
P0351
P0352
P0353
P0354
P0355
P0356
Ignition coil assembly The ECM assembly cuts the fuel injection. Pass condition detected
P0401
P0403
EGR valve assembly ECM assembly 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
P107C
P107D
Fuel pressure sensor (for low pressure side) Fuel pump (for low pressure side) control is maintained. Pass condition detected and then power switch turned off
P1276
P1277
P1278
P1279
P127A
P127B
Fuel injector assembly (for port injection)
  • The ECM assembly performs fuel-cut when the engine speed is 2000 rpm or more.
  • Fuel cut of malfunction cylinder.
Pass condition detected and then power switch turned off
P2237
P2238
P2239
P2240
P2241
P2242
P2252
P2253
P2255
P2256
Air fuel ratio sensor
  • Air fuel ratio feedback control is stopped.
  • Current to the air fuel ratio sensor heater is cut.
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.