cheluakame
21st June, 2017, 07:08 PM
Hello again everyone.
Ok, got a Focus from 2000, with a 1.6 16v engine (FYDB).
Tested with autocom, and got IAC valve problem. Replace it with new one, but the problem is still there.
So, i started to test components. IAC valves are ok both, the problem is in ECU. More exactly i get -12 volts (straight) for IAC valve, instead of 0-5 volts (negative of course) PWM.
I've tooked down the ECU and opened it, no blown pieces, nothing wrong. Tried to measure some values and it's clear that somewhere, i've got a transistor or something that remains closed and offers always -12 volts.
Is here anyone who had this problme?
Could I find somewhere internal schematic of this ECU?
P.S. It's an LP4-335 , with 1S4F-12A650-BD code.
Thanks in advance.
Ok, got a Focus from 2000, with a 1.6 16v engine (FYDB).
Tested with autocom, and got IAC valve problem. Replace it with new one, but the problem is still there.
So, i started to test components. IAC valves are ok both, the problem is in ECU. More exactly i get -12 volts (straight) for IAC valve, instead of 0-5 volts (negative of course) PWM.
I've tooked down the ECU and opened it, no blown pieces, nothing wrong. Tried to measure some values and it's clear that somewhere, i've got a transistor or something that remains closed and offers always -12 volts.
Is here anyone who had this problme?
Could I find somewhere internal schematic of this ECU?
P.S. It's an LP4-335 , with 1S4F-12A650-BD code.
Thanks in advance.