Ok todays plan was to replace the fuse and then tug every wiring harness I could see and hopefully blow another fuse as a clue. I fitted 10amp fuse, and pulled every harness, nothing, I then pushed and twisted every harness, nothing... I went int the car under the pedals and did the same, and then at the passenger side, no blown fuse, engine running nicely.... I decided I need to try to recreate the issue while moving, and I should replace the fuse with something softer to the ecu to prevent possible damage, I dont want anything inside the ecu becoming a fuse... So i guessed that the ecu needs about 2 amps, thats 24w, so I thought maybe a 21w indicator bulb would be a good fuse, no... I tried a 55w, no... So I went and got the multimeter and apparently a running ECU needs 3.5amps I decided to run some cable from the ecu to inside the cabin, and connected this to the meter, another 10amp fuse, and got power from the cigarette lighter socket 3.5amps, engine running fine, reverse like a madman down the drive, and hit the brakes, nothing... drive forwards like dukes of hazard and hit the brakes, nothing. (the postman was impressed) Repeat this, and the engine died.....meter showed some 30+amps .....and then the meter fuse went... replace meter fuse with wire as i dont have one to fit.... repeat a few more times and it doesnt happen, then it does, 10amp fuse goes this time... So to recap.. I am wired like this... +12v lighter socket---10amp_fuse--meter---ecu the only thing that can blow that fuse is something the ecu sends power to, but afaik, it only sends 5v to sensors??? the sensors are all on top of the engine and i have re_insulated the wiring - I dont think shorting one of those to ground would take 30amps, not I am going to try it, I dont want to blow the 5v supply in the ecu... Once again this car has presented me with a puzzle that would try the patience of a saint...
Posted on: Wed, 30 Oct 2013 12:28:36 +0000
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