how does an engine immobilizer work?

[boybi]

pano nga ba?

[pajerokid]

AFAIK, kung yung immobilizer ng alarm and pinaguusapan, it simply kills the starter circuit.

[boybi]

nope, yung built in immobilizer ng patrol.

[MAXBUWAYA]

my echo has one

yung susi may chip sa loob \

pag pinasok sa ignition babasahin yung chip ng ECU

kaya pag duplicate hindi gagana

kaya siguro my echo comes with 3 keys

[wildthing]

I think it is not really a plain "chip" or IC chip, it's possibly something like a reed switch which functions "like" a magnetic sensor to identify the presence of the right keys. Imbeded ang sensors sa plastic protion

Pero kung di-baterya ang susian then it probably functions like an RF transmitter.

[benny010]

What is embedded in the key is one precision resistor. When you insert the key in the ignition, the resistor becomes part of a simple circuit involving 3 other resistors. If the key does not have a resistor or if the resistor has the wrong value, the circuit disables part of the car's electrical system to prevent the car from starting.

So why is this system using something as mundane as a single resistor rather than some sort of sophisticated embedded computer? There are probably two reasons: 1) manufacturing cost, and 2) reliability. The latter is probably a very big part of the equation. Think about everything a key goes through -- it's typically riding in a pocket full of coins, getting thrown on the table, opening bottles, and so on. Keys have to be remarkably durable, they have to last the life of the car, and they must always work. If a system that depends on a single resistor can do a good job, then that's a good system to use because there is less that can go wrong.



boybi, if your key (metal part) has two contact points... you can measure it by the use of precision tester using the resistance setting. if the resistance does not varies if you change the polarity of the wire probe, it is a resistor, otherwise it might composed of circuits...
:roll:

[boybi]

benny010, walang contact point akong nakikita sa key. the metal part is just a solid metal. pero dun sa jacket meron kasing tab na parang pwdeng buksan.

[RedHorse]

Q, fellow trooper owners,

pinalitan nyo na ba oem alarm ng trooper, and if yes, anong brand. Yong sa amin kasi, pinalitan ko na battery, okay pa naman, kaya lang, pag nagpark ka sa lugar na may mga radio antenna, hindi gumagana, kailangan susian mo talaga. Marami pa namang ganito spots sa QC.

[boybi]

pag nagpark ka sa lugar na may mga radio antenna, hindi gumagana, kailangan susian mo talaga.

hindi ko pa na-experience yan a.

[benny010]

boybi, di natin mati-test yun kung gan'un... tignan natin kapag sumama ka sa EB... :P

RedHorse, di ako nagpalit ng oem alarm... ok na kasi ako sa existing silicon alarm ng trooper... bakit ganun, sususian mo? ibig ba sabihin nag-sound yung alarm pero di nagbikas ang pinto? baka may problema sa connection ng auto power door lock , or its actuator.

[wreckless]

Q, fellow trooper owners,

pinalitan nyo na ba oem alarm ng trooper, and if yes, anong brand. Yong sa amin kasi, pinalitan ko na battery, okay pa naman, kaya lang, pag nagpark ka sa lugar na may mga radio antenna, hindi gumagana, kailangan susian mo talaga. Marami pa namang ganito spots sa QC.

experienced this with the starex..
nung minsang pumunta ako sa GMA Network.

[happiman]

na-experienced ko din yan sa alarm ng civic ek ko sa pay parking ng makati med. kapag duon naka parada eh laging ayaw bumukas ng pinto.

[boybi]

baka me nagmumulto?! 8O :| :mrgreen:

[mazdamazda]

yung iba... as fuel pump ang cutoff... makapag drive ka for a few kilometers pero mamtay din afterwards...

so kung sa valet o iwan ang car mo... ang iwan mong susi sa kanila ay yung valet key... kapag nilabas nila ng malayo yung kotse eh for sure mamatayan yun.