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Home >> Infiniti >> 2011 >> M37 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 90 (Security Control System) >> DTC/Circuit Diagnosis >> DTC B20A0: Cranking Request Circuit >> DTC Logic >> DTC Detection Logic
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DTC Detection Logic

WARNING: This page is about a different car, the 2012 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
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 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