Tj jeep stalling aproxx 10 sec after start please help

[Bentj]

Hi i have a 2005 tj thag stalls about 10 sec after starting
Recently had a code for crank angle sensor changed but didnt fix prob had auto electrition out he found loose coil pack plug and alternator that was buggered now she runs but dies after 10 sec and foesnt thro any codes as yo why

Thanks for your help i really need this car going for work

[RPG]

Can you hear the fuel pump running in the fuel tank. It should start when the ignition is turned to on. And continue running once started. It needs to see a run signal to continue pumping. The pump stops if it doesn’t see a run signal as a safety precaution.

[layback40]

Is the battery in your key-fob good? The security system allows the jeep to be started but cuts it out after about 10 seconds.

[bonza]

there's no battery in the key fob, just a chip, at least for TJ's anyway. sounds like an immobiliser problem. that I have no clue how to sort out

[layback40]

Originally Posted by bonza

there's no battery in the key fob, just a chip, at least for TJ's anyway. sounds like an immobiliser problem. that I have no clue how to sort out

I am not saying you are wrong, but if it doesnt have a battery, its the only key fob that doesnt. There are a ton of videos showing how to replace the battery. Maybe the OP needs to post a pic of the key fob. The KJ definitely has a battery & I suspect so to does the TJ.

[FARWEST]

No expert on TJ's...but...if a fob has a chip its surely gotta have a battery source to power it ????....not an engineer but kinda seems like basic electrics ????

[bonza]

I also have a 79 series land cruiser that uses the same system. a sentry key that has a chip and a completely separate fob with a battery to send a signal to open/close door locks

the chip in the key has a unique code that receives a a radio frequency signal from the sentry key immobiliser module (skim) that is adjacent to the ignition switch and has a round antenna wrapped around the key barrel. when the skim reads the key and verifies the code it in turn ok's the pcm to allow engine ignition. the whole system is called sentry key immobilizer system (skis)

the electrical power is in the skim, not the key. just like antennas do not need power to receive signals.

keys with batteries have the ability to do other things, like open doors, whereas my cruiser like the jeep has a key with just a chip, but a separate fob with battery for powering door locks

I think you find those you tube clips about replacing key fob batteries are those type of keys for remotely closing and opening door locks as well. nor powered door locks on a TJ

to the op, does the the skis warning light stay illuminated? a scan tool should detect any skis related dtc's. if not I'd be tracing earth faults

I'm an engineer, but not electrical and certainly no expert so am happy to stand corrected