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Home >> Infiniti >> 2013 >> M56 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0183 >> DTC P0031, P0032, P0051, P0052: A/F Sensor 1 Heater >> DTC Logic >> DTC Detection Logic

DTC Detection Logic

DTC No. Trouble diagnosis (Trouble diagnosis content) DTC detecting condition Possible cause
P0031 A/F SEN1 HTR (B1) [A/F sensor 1 heater (bank 1) control circuit low] The current amperage in the A/F sensor 1 heater circuit is out of the normal range. (An excessively low voltage signal is sent to ECM through the A/F sensor 1 heater.)
  • Harness or connectors (The A/F sensor 1 heater circuit is open or shorted.)
  • A/F sensor 1 heater
P0032 A/F SEN1 HTR (B1) [A/F sensor 1 heater (bank 1) control circuit high] The current amperage in the A/F sensor 1 heater circuit is out of the normal range. (An excessively high voltage signal is sent to ECM through the A/F sensor 1 heater.)
  • Harness or connectors (The A/F sensor 1 heater circuit is shorted.)
  • A/F sensor 1 heater
P0051 A/F SEN1 HTR (B2) [A/F sensor 1 heater (bank 2) control circuit low] The current amperage in the A/F sensor 1 heater circuit is out of the normal range. (An excessively low voltage signal is sent to ECM through the A/F sensor 1 heater.)
  • Harness or connectors (The A/F sensor 1 heater circuit is open or shorted.)
  • A/F sensor 1 heater
P0052 A/F SEN1 HTR (B2) [A/F sensor 1 heater (bank 2) control circuit high] The current amperage in the A/F sensor 1 heater circuit is out of the normal range. (An excessively high voltage signal is sent to ECM through the A/F sensor 1 heater.)
  • Harness or connectors (The A/F sensor 1 heater circuit is shorted.)
  • A/F sensor 1 heater