P1613

ECM INT CIRC-IMMU

System Description
IVIS (Infiniti Vehicle Immobilizer System - NATS) will immobilize the engine if someone tries to start it with-out the registered key of IVIS (NATS). Only IVIS (NATS) ignition keys with ID numbers that have been registered into the ECM and the IMMU allow the engine to run.
A malfunction that triggers this code may turn the security indicator ON to make the engine hard to start. If the security indicator illuminates with the ignition key ON or the engine running, it may indicate that there is an abnormality in the system. For this condition perform SELF DIAGNOSIS.
It is normal for the security indicator to blink when the ignition switch is in OFF or ACC.
IVIS (NATS) trouble diagnoses, system initialization and additional registration of other IVIS (NATS) ignition key IDs must be carried out using CONSULT-II hardware and CONSULT-II IVIS (NATS) software.

On Board Diagnostic Logic
The malfunction of ECM internal circuit of IMMU communication line is detected.

Possible Cause
- ECM

Diagnostic Repair Procedure (for confirmed incidents)
1. ECM component test: Perform steps a to c
a. Confirm SELF DIAGNOSIS "ECM INT CIRC-IMMU" displayed on CONSULT-II screen. (See part B below.)
b. Replace ECM.





c. Perform initialization with CONSULT-II.

Diagnostic Repair Procedure (for unconfirmed incidents)
1. Run engine; select SELF DIAGNOSIS with CONSULT-II; perform "Wiggle Test" on all related connectors.
2. Inspect all related harnesses, connectors and pins.



Symptom Matrix Chart