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Home >> Infiniti >> 2017 >> QX80 Base, RWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTCS) (1 Of 4) >> DTC/Circuit Diagnosis >> DTC P00B3, P00B4: Engine Coolant Temperature Sensor 2 >> DTC Logic >> DTC Detection Logic
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DTC Detection Logic

DTC No. Trouble diagnosis name
(Trouble diagnosis content)		 DTC detecting condition Possible Cause
P00B3 RADIATOR COOLANT TEMP SEN
(Radiator coolant temperature sensor circuit low)		 ECM detects the following status continuously for 5 seconds or more:
A voltage signal transmitted from the engine coolant temperature sensor 2 is 0.04 V or less.
  • Harness or connectors

    (Engine coolant temperature sensor 2 circuit is open or shorted.)

  • Engine coolant temperature sensor 2
P00B4 RADIATOR COOLANT TEMP SEN
(Radiator coolant temperature sensor circuit high)		 ECM detects the following status continuously for 5 seconds or more:
A voltage signal transmitted from the engine coolant temperature sensor 2 is 4.84 V or more.
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