billr wrote:Referring to the schematic you linked to recently, showing the 2N2222...
Voltage at 54 drops to 2V, right? Measure voltages on 30, 85, 86, and 87A of the ECU relay, and voltage on the 2N2222 collector. Also measure resistance of the ECM relay coil. It would help to verify the current in the collector circuit, to make sure it is only handling the coil current. It really sounds like a wiring problem, not the triggering of that ECM relay.
yes, on 54.. when i just connected ecu, everything was ok, on 54 pin was ~12v, then as soon i tried to start engine, ecu lost power immediately. and after that all time on pin 54 comes 2V.... i've installed new transistor, new resistor but nothing...(the same was 2 days ago with 7.5k) strange...
on 30 and 86 comes 12v...
87A is pin 54 yes? as i said there's 2v
on 86 (pin 27) 10V
and how to measure resistance of the ECM relay coil ?
Edit: You could also try by-passing that 2N2222, just short the collector to ground. However, if there is some kind of a wiring problem that may fry a wire instead of just heating the transistor. Be careful, observant, and quick.
ok.. i try tomorrow