Nissan Altima B2193 P1612 Chain of ECM IMMU

B2193, P1612: ECM-IMMU ChainDescriptionThe Body Control Module (BCM) plays a crucial role in ID verification with the Engine Control Module (ECM), allowing the engine to start. The ECM, in turn, prevents engine ignition if the ID is not registered. Communication between the BCM and ECM initiates when the ignition switch is turned ON.DTC LogicDTC Detection LogicWhen DTC B2193 is displayed in conjunction with DTC U1000 or DTC U1010, a comprehensive trouble diagnosis is necessary. Addressing these associated DTCs is crucial for a thorough examination.DTC Confirmation Procedure
  • Perform DTC Confirmation Procedure

  • Turn the ignition switch ON with the CVT selector lever in P or N position.Check “Self Diagnostic Result” with CONSULT-III.
  • If DTC is detected, refer to SEC-460 for the Diagnosis Procedure. If not, inspection concludes.

    Diagnosis Procedure1. Replace BCM
  • In case of a detected malfunction, replace the BCM following BCS-96, “Removal and Installation.”Perform initialization with CONSULT-III.
  • If the engine starts, the BCM is malfunctioning. Replace and initialize again. If not, proceed to ECM replacement.2. Replace ECM
  • If the engine does not start after BCM replacement, replace the ECM.Perform ECM re-communicating function.
  • Additional Information
  • NATS trouble diagnoses, system initialization, and key registration must use CONSULT-III hardware and software.Security indicator behavior with Intelligent Key and mechanical key explained.Conditions triggering the “CHAIN OF ECM-IMMU” during key registration.
  • B2192, P1611: ID Discord, IMMU-ECMDescriptionThis section addresses issues related to ID discord between the BCM and ECM, affecting the engine starting process.DTC LogicDTC Detection LogicSimilar to B2193, if DTC B2192 is displayed with DTC U1000 or DTC U1010, trouble diagnosis should begin with the associated DTCs.DTC Confirmation Procedure
  • Perform DTC Confirmation Procedure

  • Turn ignition switch ON with CVT selector lever in P or N position.Check “Self Diagnostic Result” with CONSULT-III.
  • If DTC is detected, refer to SEC-459 for the Diagnosis Procedure. If not, inspection concludes.

    Diagnosis Procedure1. Perform Initialization
  • Perform initialization with CONSULT-III.Re-register all keyfobs.
  • If the system initializes, and the engine starts with re-registered keyfob, the ID was unregistered. If not, replace BCM and perform initialization again. If the issue persists, replace ECM.

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