Hi my mechanic put a second hand ecu in my Toyota rav4 2004, but it won't accept it, can you please help... Thanks

Hi Bob

You need a mobile mechanic with a $5,000 professional grade scan tool computer to diagnose the electronics. I suspect your replacement ECU are faulty and the communications or power to it. Look at the Scotty Kilmer YouTube channel and search scan tool. He uses them frequently and shows what they are capable of. He did a Nissan Altima within the last couple of days.

throttle cable or kick back cable?

What is a "Help" tester??
Use an OBD2 sacnner and read to DTC?
Why did you unplug or R/R the ECU in the first place.
With just the information you provide your problem might be in the wiringharness or a bad ecu..

Hi Ian, I suggest you get it programmed by an agent. Regards John

Hi, if you put your key in to the ignition and the dash lights up and when you turn it to crank and nothing happens , well it can be a couple of things , i would need to know more of the symptoms , but if that is happening and you keep turning the key on and off and eventually it fires up , it is the ecu that has gone bad im afraid ,unless you are loaded with cash you wont mind the mb bill for parts and labour , the best solution is get a second hand one from a van dismanteler , i would recommond dronesfields in manchester excellent alround , the look out for a good indie and have him take the dump file that is on the old ecu and keep it on file so when you get the replacment ecu he will be able to load the file onto it .
hope this is of help to you ,
cheers Joe.

Hi

You did not mention the Toyota car model that you have. Please check this helpful link along with the other links inside it ,which may give you some light to resolve your problem as to how you put the alternator belt, hope it helps:-

http://www.ehow.com/how_5484571_replace-toyota-alternator-belt.html

Please get back to us if you have further query else please accept the suggestion.
Thank you for contacting fixya.com

doubt if it is the ECU
check the ecu fuse in the engine bay cluster
and the starter relay are ok

check for spark at the plugs
and fuel pump is working
the fuel pump has a relay


ECUs dont go bad due to flat battery
if you jump started the toyota without putting the jumping earth lead to your toyota motor direct as an earth ecus may blow the fuse

Hi dude just remove the small rubber bung on the dash board left hand corner.then with a small long pin or something press the reset button in there and the light should go of for another 20,000ks hope this helps cheers

the ECU is located on the passenger side floorboard underneath the consold and carpet