ECU connection problem
#1
![UK](https://www.rx8club.com/images/icons/ukflag.jpg)
i recently bought a crash damaged uk 55plate rx8 to sort out and keep. it was mostly suspension damage and i have pretty much got it all sorted.
the problem is it came without keys. i got a local specialist to come out and make me a key and it all went great until he tried to plug into the EOBD port and could not get any communication. i also got my snap on machine out and found i could not connect either. checked all the fuses under the bonnet but all seems fine. so i am left with an uncoded key that turns the ignition on but nothing else. anyone got any ideas? read somewhere that the ecu bay be locked. how can i tell? any help would be great! thanks in advance.
the problem is it came without keys. i got a local specialist to come out and make me a key and it all went great until he tried to plug into the EOBD port and could not get any communication. i also got my snap on machine out and found i could not connect either. checked all the fuses under the bonnet but all seems fine. so i am left with an uncoded key that turns the ignition on but nothing else. anyone got any ideas? read somewhere that the ecu bay be locked. how can i tell? any help would be great! thanks in advance.
#5
checked all interior fuses and there all fine. still no communication. any ideas? dont want to take it to a main stealer's if its something simple. starting to think it may be my only option.
cheers for the advise so far though.
cheers for the advise so far though.
#8
hmmmm that's what worries me. got some good news today though. managed to get in touch with the previous owner and he has a key. should have it Monday. hopefully it will just fire straight up and the connection problems will be nothing to worry about. fingers crossed. failing that i need a wiring diagram for the ecu plug to see if it is all ok. if that's all fine then i am thinking 2nd hand ecu, immobilizer boxes and key. why is nothing ever simple???
#12
Metatron
iTrader: (1)
Has the steering column been accessed/damaged?
Perhaps the pick-up coil for the key chip is dislodged or disconnected.
There are two other fuses in the engine bay that send the ECU it's power - they are 10 amp, marked 'engine'.
If you still need a wiring diagram, drop me a pm.
Perhaps the pick-up coil for the key chip is dislodged or disconnected.
There are two other fuses in the engine bay that send the ECU it's power - they are 10 amp, marked 'engine'.
If you still need a wiring diagram, drop me a pm.
#13
steering column looks fine. i will have a look at it though. when i wait for the immobilizer light to stop flashing fast i get the code 1 6.
where is the immobilizer box located? thinking maybe something could have been rattled loose/damaged in the crash.
don't want to take it to the stealer's but i am starting to run out of options.
where is the immobilizer box located? thinking maybe something could have been rattled loose/damaged in the crash.
don't want to take it to the stealer's but i am starting to run out of options.
#14
Registered
iTrader: (3)
I AM FACED WITH THE SAME PROBLEM.
Different scenario and mine is on a 2009. but I am getting a no connection to pcm also. The dealership says the car needs a new computer and I just cant believe that as the night before, the car was running fine.
The immobilizer is not at fault---dont chase that. its light is going off because it too cannot communicate with the computer.
My harness is good, my fuses and relays are good. The pcm is getting power as my cel light is on.
But for some reason, NOTHING can connect with it, not even the dealerships equipment.
I am in the process of selling this car (cheaply) one reason is because this has been so fustrating. IF it is a dead computer then I have to know what made it die? No one has been able to tell me. One tech said lightening struck it--lol!!
Different scenario and mine is on a 2009. but I am getting a no connection to pcm also. The dealership says the car needs a new computer and I just cant believe that as the night before, the car was running fine.
The immobilizer is not at fault---dont chase that. its light is going off because it too cannot communicate with the computer.
My harness is good, my fuses and relays are good. The pcm is getting power as my cel light is on.
But for some reason, NOTHING can connect with it, not even the dealerships equipment.
I am in the process of selling this car (cheaply) one reason is because this has been so fustrating. IF it is a dead computer then I have to know what made it die? No one has been able to tell me. One tech said lightening struck it--lol!!
#15
sorry to hear your having the same problem. thought it was just me though lol. well had mine to the dealers today and they suspect the PCM. they are removing it and checking the wiring to confirm.
looks like i will be sourcing a 2nd hand pcm. anyone know for sure if it has to be a matching pcm immobilizer and key or can i just change the pcm?
looks like i will be sourcing a 2nd hand pcm. anyone know for sure if it has to be a matching pcm immobilizer and key or can i just change the pcm?
#17
problem solved!!!!! wooo!!!!
turns out the car was totally missing a fuse. something to do with the throttle valve or something. said maybe the police removed it to immobilize the car as it was stolen and recovered. whatever it was i dont care as its sorted now. my troubles are over...for now.
turns out the car was totally missing a fuse. something to do with the throttle valve or something. said maybe the police removed it to immobilize the car as it was stolen and recovered. whatever it was i dont care as its sorted now. my troubles are over...for now.
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