Fuel rail pressure plug

[ibizaworld]

Hi Guys, 1st post as just joined the forum. situation is purchased Berlingo van in summer and big end cap went 3 weeks ago, no head/valve damage but jammed crank instantly from turning and sheared all bolts on flywheel (thought I'd gone over a set of speed traps). Anyway all repaired and back but just wont start. No fuel in fuel rail. Now the plug that goes on the rail sensor has the 3 wires grey white purple which approx 6 inches from the plug all 3 wires have been cut and joined with bullet connectors, grey appearing to be GND when checking with meter but the previous person has got the white and purple crossed at the bullet joints. This plug also doesn't lock onto the shank of the sensor as been mauled with before as a lot of other things appear to have too as I did snag the 3 cables not long after I first got it dragging one of the wires with plug terminal out the plug. I then had a non runner for an hour until I'd found and repaired.

I want to check the order as firstly when I look into the fuel sensor the pins are numbered 1-3 from L to R but from what i have read pin 1 is GND yet everyone appears to state that the middle pin on the plug which corresponds to pin no.2 on the sensor is ground.

Can anyone clarify this please and also is the white the permanent 12v and purple the feedback?

many thanks.

[brajomobil]

Hi,

Don't know about wires color. You can check with multimetar like this.
Take wires from ecu side. Find ground by continuity. Switch to voltage.
Turn on ignition. Find on what wire is constant 12v or 5v. (depends on ECU and sensor type)
The third wire is signal return from sensor.


Best regards,
brajomobil

[ibizaworld]

Thanks for that, yes that’s todays job as daylight went last night, I did do as you recommend but had 2 x 5v feeds on the plug, will try putting pressure into the sensor via connected tube to see if I can get one to alter

[brajomobil]

Thanks for that, yes that’s todays job as daylight went last night, I did do as you recommend but had 2 x 5v feeds on the plug, will try putting pressure into the sensor via connected tube to see if I can get one to alter

You have to test with disconnected sensor!
That sensor is for >100 Bars , so testing with pressure tube is highly unlikely.

You can test the sensor with oscilloscope when cracking the engine.
That is step 2 if the above test passes ok.

Best regards,
brajomobil