Car Wont Start - PIM, VTA1 & VTA2 All highlighted on PFC

[boosted]

no relays no fuses 5v circuit, test at plug end mate pls.

[boosted]

just checking this is defo a 5v circuit?

[boosted]

yes just confirmed...can we run a separate earth wire from 1 plug end back to 4d to make sure we have not got a bad earth?  if that dont work then looks like 5v failing under load.

[ttpower]

Yeah we have 5v at all the connectors but only when they plugged out

[ttpower]

Ok so I connected only the map sensor connector directly to the ecu via pin 3i and 4d. Voltage without connector installed drops to 2.8v and when plugged in 0.4v??
Confused now? Any thoughts?

[ttpower]

Could the ground for the ecu be bad. Checked for resistance of 4d and showing 0 which is good I think?

[boosted]

Looks like voltage regulator is failing on load. Time to try your mates apexi.

[boosted]

The reason for the 5v circuit having its own earth at the ecu is to seperate from power circuits for protection. Id be inclined now to

1 final test....cut 4d   resistance between 3i and 4d no sensor in and  ohms....what value? Should be open circuit ? Switch to continuity beep test..should be no beep.

2.Remove yours and covers off and be looking at a dry joint on pin 4d .
1.Small earth wire from chassis to ecu cage.
3.Try your mates apexi.

[ttpower]

Ok so....

1 - cut wires 3i & 4d at ecu and tested resistance, showing 0. No continuity/beeping between 3i & 4d.

[ttpower]

2- looking at the board the pins look good and 4d shows continuity. However part 3050c (board of15) looks burnt browny colour at the connectors and has some flacky stuff around the pins on both sides of the board.

3- tried my mates apexi and working perfect. Showing 5v at ecu, at connector and at connector when plugged in.

[ttpower]

Anybody in UK who can fix this or should I be looking at a new fc

[boosted]

Happy no short and that 5v failing under load gave us the runaround. Dont know if can be fixed in uk.

least when you get a replacement youll know a wiring fault not gonna take it out.

[ttpower]

Do you recon it was the window motor that was shorting that ground caused it to short out. I think its damaged that component which lowers the voltage 3050C.

Definitely a runaround but found wires that need seeing to as well.

Is there any way to test a ground to the chassis. Is it that it should just read 0 on the resistance test.

[boosted]

It shouldnt have because it has its own earth wire all the way back to the ecu...that component is probably the voltage regulator....prob about 79p from maplins! All your earths should 0 ohms...or very low from each other back to the battery neg.

[ttpower]

I think the earth wire is also part of the same batch of earting connectors. Just want to make sure that theproblem is fixed prior to fitting another ecu. Yeah it says it\'s a voltage regulator, might give it a go and see.

If one earth is bad on the chassis would that cause it to effect the whole circuit