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Home >> Infiniti >> 2011 >> QX56 RWD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Security Control System >> DTC/Circuit Diagnosis >> DTC B20A0: Cranking Request Circuit >> DTC Logic >> DTC Detection Logic
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DTC Detection Logic

NOTE:
  • DTC B20A0 can be detected although the related circuit is not used in this vehicle.
  • If DTC B20A0 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to "DTC LOGIC ".
DTC DETECTION LOGIC

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
B20A0 CRANK REQ CIR SHORT When the following items do not match, a malfunction is detected.
  • Cranking request signal from ECM
  • Starter control relay control signal from ECM (CAN)
  • Harness or connectors (CAN communication line is open or shorted.)
  • Harness or connectors (Cranking request signal circuit is open or shorted.)
  • IPDM E/R
  • ECM