Reset ecu on Nissan hardbody 2006 model.stoped it at home,now wont start.maybe for second or two.Nats light not working on dash. keys still opening doors,enjin turning,does not start.enjin check light

Have you had a battery disconnect recently? Did you try resetting the the security system and engine immobilizer?

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OK immo RULES 101

1. IT CAN NOT BE HACKED.! (design goal A#1)!
   
2. The car came new with 2 keys, are both dead. or lost it.?
3. immo ends theft OF CAR, see rule 1 , zero hacking'
4. the lamp on the dash by any name means 3 things bad key , bad immo or all is good. the glove box guide tells you for sure how that IMMO lamp works, lost the book ?, will in uSA it is free, at all dealers and online (by laws, safety here)
5. some FOBs have a tiny battery , non passive keys to start. so check for that
6. never have both keys inside car same time for sure passive key or they both try to win the ACCESS.
7. if all keys fail (good before) scan the PCm and it sure will tell you why it fails, (bad key , or iMMO modules 1, or 2 failing, etc.

passive keys /fobs , the battery only opens doors.
passive , keys for the engine , the key lock ignition is RFID type design. this means batter in key is for stating the engine'
Nissan Anti-Theft System = nATs
NATS is a transponder passive system, no battery needed in key.
these parts are all married, that means only scans find the truth.
SM quotes

• BCM
• ECM
• IPDM E/R
• Ignition key
• NATS antenna amp.
• Combination meter

If nothing works, you need the dealership with a scan tool computer.

If locking (using the plip) and unlocking after waiting 15/20 minutes doesn't work you can try disconnecting the battery again, leaving it several hours and then opening the door and switching on the ignition and finally reconnecting the battery.

If that doesn't work I suggest you take advice from the dealer or try an internet search.

Nothing you can do , except make it worst . All vehicles from 2000 on have a transponder chip inside the key head . You need a factory or some other professional type scan tool to read codes in the theft - deterrent module . You can't guess an fix the problem . You can buy a launch scan tool for about $800.00 that would work. You need to know the code stored .

https://www.aa1car.com/library/troubleshoot_antitheft_system.htm

NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS) PFP:25386 Description UBS00MOP ? If the security indicator lights up with the ignition switch in the ON position or "NATS MALFUNCTION" is displayed on "SELF-DIAG RESULTS" screen, perform self-diagnostic results mode with CONSULT-II using NATS program card. Refer to BL-102, "NVIS(NISSAN Vehicle Immobilizer System-NATS)" . ? Confirm no self-diagnostic results of NVIS (NATS) is displayed before touching "ERASE" in "SELF-DIAG RESULTS" mode with CONSULT-II. ? When replacing ECM, initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs must be carried out with CONSULT-II using NATS program card. Therefore, be sure to receive all keys from vehicle owner. Regarding the procedures of NVIS (NATS) initialization aand all NVIS (NATS) ignition key ID registration, refer to CONSULT-II Operation Manual, IVIS/NVIS. SEF543X

S (Nissan Vehicle Immobilizer System-NATS) has the following immobilizer functions:
Since only NVIS (NATS) ignition keys, whose ID nos. have been registered into the ECM and IMMU of NVIS (NATS), allow the engine to run, operation of a stolen vehicle without a NVIS (NATS) registered key is prevented by NVIS (NATS). That is to say, NVIS (NATS) will immobilize the engine if someone tries to start it without the registered key of NVIS (NATS).
All of the originally supplied ignition key IDs have been NVIS (NATS) registered. If requested by the vehicle owner, a maximum of five key IDs can be registered into the NVIS (NATS) components.
The security indicator lamp blinks when the ignition switch is in "OFF" or "ACC" position. Therefore, NVIS (NATS) warns outsiders that the vehicle is equipped with the system.
When NVIS (NATS) detects trouble, the security indicator lamp lights up while ignition key is in the "ON" position.
NVIS (NATS) trouble diagnoses, system initialization and additional registration for other NVIS (NATS) ignition key IDs must be carried out using CONSULT-II hardware and CONSULT-II NVIS (NATS) software. Regarding the procedures for NVIS (NATS) initialization and NVIS (NATS) ignition key ID registration, refer to CONSULT-II OPERATION MANUAL IVIS/NVIS.
When servicing a malfunction of the NVIS (indicated by lighting up of Security Indicator Lamp) or registering another NVIS ignition key ID no., it is necessary to re-register original key identification. Therefore, be sure to receive ALL KEYS from vehicle owner. System Composition NIEL0174 The immobilizer function of the NVIS (NATS) consists of the following:
NVIS (NATS) ignition key
NVIS (NATS) immobilizer control unit (IMMU) located in the ignition key cylinder
ECM
Security indicator lamp.

ANTI-THEFT SYSTEM ! Did you change KEY'S

First check to see if you have a good battery and then begin checking current to your ECU. Might also want to check fuses / relays. Have you checked fuel pressure ?

Does the scan tool light up, but doesn't connect. It could be wiring or the ECU. If the scan tool doesn't light up, check fuses. Most DLC connectors are power by the lighter /power point fuse.

this refers to the ignition switch being being turned on more than 5 times by a unregistered key ie the valet key, your main chipped key will need to be reset to the ignition follow this link for further advice
P1610 Nissan Lock Mode

DTC P1612 is a NATS (Nissan Anti Theft System) code.
Cycle the key ON for a second than OFF for 10 do this until the security light goes out.

If not you will have to key the key reprogrammed.

Hope this helps to solve it.