jimbo34
03-23-2019, 05:28 AM
I need some advice please. I was trying to jump start my wifes 2003 Mk1 Yaris in the dark and unfortunately I managed to reverse the polarity on the jump cables. The car was completely dead afterwards with the 120A ALT (alternator?) fuse and the 15A EFI (fuel pump?) fuses obviously blown.
After trying to jump again (correctly this time) the car had power but when I turned the ignition, the engine would turn over (starter working) but the car won't start.
I've taken the car to a local garage, the guy changed some more fuses quickly but says that because the engine check light doesn't come on when the key is turned, the ECU is broken. I'm inclined to agree but for one thing, the immobiliser switches off when the key is inserted (red security light stops flashing). Does this indicate that the ECU is still, at least partially functional or are the 2 unrelated? Could it not be starting due to problems with the alternator or fuel pumps?
Finally, if it is the ECU, I've seen second hand units on ebay for less than 100 euros. Is it a straightforward job to simply plug in a new one and change the ignition switch?
Any help would be appreciated!
After trying to jump again (correctly this time) the car had power but when I turned the ignition, the engine would turn over (starter working) but the car won't start.
I've taken the car to a local garage, the guy changed some more fuses quickly but says that because the engine check light doesn't come on when the key is turned, the ECU is broken. I'm inclined to agree but for one thing, the immobiliser switches off when the key is inserted (red security light stops flashing). Does this indicate that the ECU is still, at least partially functional or are the 2 unrelated? Could it not be starting due to problems with the alternator or fuel pumps?
Finally, if it is the ECU, I've seen second hand units on ebay for less than 100 euros. Is it a straightforward job to simply plug in a new one and change the ignition switch?
Any help would be appreciated!