NATS (Nissan Anti-Theft System) / Gasoline engine — Trouble Diagnoses (Cont'd) — Diagnostic Procedure 4 (CHAIN OF IMMU-KEY) (Supplement-VII)
EL-7069flowchartProcedure 4: CHAIN OF IMMU-KEY → test with spare registered key first. Source has Spanish CONSULT-II translation embedded ('CADENA IMMU-LLAVE').
Trouble Diagnoses (Cont'd)
DIAGNOSTIC PROCEDURE 4
Self-diagnostic results: 'CHAIN OF IMMU-KEY' displayed on CONSULT-II screen
Procedure 4 — IMMU cannot receive key ID signal
1
[A] Confirm SELF-DIAGNOSTIC RESULTS 'CHAIN OF IMMU-KEY' displayed on CONSULT-II screen. (SULT-II 'RESUL AUTODIAGNOSIS' aparece 'CADENA IMMU-LLAVE'.)
OK
2
CHECK NATS IGNITION KEY ID CHIP. Start engine with another registered NATS ignition key. Does the engine start?
Yes (other key works)
• Ignition key ID chip is malfunctioning. 1) Replace the ignition key. Ref. part No. E. 2) Perform initialization with CONSULT-II. For the initialization procedure, refer to 'CONSULT-II operation manual NATS'.
• Ignition key ID chip is malfunctioning. 1) Replace the ignition key. Ref. part No. E. 2) Perform initialization with CONSULT-II. For the initialization procedure, refer to 'CONSULT-II operation manual NATS'.
No (no key works)
3
CHECK IMMU INSTALLATION. Check IMMU installation. Refer to 'How to Replace IMMU'.
No (installed incorrectly)
Reinstall IMMU correctly.
Yes (installed correctly)
4
• IMMU is malfunctioning. 1) Replace IMMU. Ref part No. A. 2) Perform initialization with CONSULT. For the initialization Procedure, refer to 'CONSULT-II operation manual NATS'.
NOTE
CHAIN OF IMMU-KEY means IMMU cannot receive the key ID signal at all. Procedure:
1. Try another registered NATS key — if engine starts, the original key chip is bad (replace key + re-init, ref. E)
2. If no key works, check IMMU installation — reinstall correctly if wrong
3. Otherwise IMMU is bad — replace IMMU + re-init (ref. A)
Note on Spanish text in source: 'CADENA IMMU-LLAVE' is the Spanish CONSULT-II translation of 'CHAIN OF IMMU-KEY' — included as a hint for international markets.
WARNING
Key-chip failure is most often caused by physical damage (drop, water, transponder antenna broken). Easy diagnostic: try a known-good registered key. If it works, the problem key is bad.