Multiecuscan

Hi all,

I've had problems with my car after replacing my heater matrix, When tightening a bolt on the bulkhead my socket wrench touched the + of the battery and ever since, When I turn my car to ignition my IAW/Injection light comes on and stays on, also my fuel pump I assume is still humming even after a good 20-30s and will not go off. Even when the engine is started (which seems to be running as normal) it is still lit? I don't know if to assume I've shorted my ecu? or put an error within it. but the light won't go out. So I wondering as the garages I have been cant help, If this program will work with my Mark 1 1997 punto 55s? I can get number/s etc off the ecu box and post here. Im just hoping there is an error recorded within because even after having the battery off for more than 30mins it has'nt helped. Yet the engine is running fine as normal.

Thanks
Please help. I just want to get it sorted as I carry my 2year old in the car and I'm thinking if I had a crash at the moment im sure the fuel pump would continue pumping. Just want to get it sorted.

Dave

normally when crashed and engine runs - pump will work. BUT you have fire prevention switch(? sorry for my weak english) which activates automaticly when it detects a hit and disconnect fuel pump. your engine can be ruined, no power or anything else but whis switch will disconnect fuel.

read your manual.

it is posted there, where you have to look for that button to press in case of harmless hit, when you want continue your drive.

cmgunn3r wrote:Im just hoping there is an error recorded within because even after having the battery off for more than 30mins it has'nt helped. Yet the engine is running fine as normal.

Try to disconnect battery for 24h (and after 1 hours short-circuit the positive and the negative cables togheter, obviously without connect the battery )

Bye
Diego

Hi cmgunn3r,

I've seen your similar posts on Fiat Forum. Have you seen the thread there for a reader for older Fiats? (can't remember thread title but something to do with cinquecento). The older Fiats used a protocol different from the OBD so I don't think the Multiecuscan program will work for you (in fact I'm sure it won't), even if you patched your 3-pin connector to the OBD 16-pin socket.

I note that your tacho died at the same time as the fuel pump issue. They have something in common.

I note that you have IAW16F. Pin 23 supplies 0V to the relay that operates the fuel pump but it also goes to the tacho. The relay contacts also supply 12V to the HT coils, the injector and the heater in the lambda sensor.

A short to earth of anything connected to ECU pin 23 (or an ECU internal short) would put the relay on whenever the ignition is on. You need to determine whether the fault is inside or outside the ECU.

Pull the connector off the ECU and measure resistance between pin 23 (on the loom, not on the ECU) and earth. Disconnect battery first! A short circuit would be suspect (expect some sort of reading to account for the relay coil). If the loom side is OK, measure ECU pin 23 to earth. A short there is bad news though! Perhaps get someone else to measure their pin 23 to give reference readings


blackfish


P.S. sirapacz - the "fire prevention switch" is an inertia fuel cut-off that has to be reset manually. cmgunn3r says the engine runs OK so this switch is not tripped.