Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! | Technical matters | Back Room Forum

Tue 12 Jan 2016 01:05

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - William33

Ok here goes, had this van for years, first got it it went like a rocket ship but not now, about 3 years ago van wouldn't start, Peugeot specialist diagnosed as ecu fault do replaced ecu and all was good, about a year later under hard load it would cut out, and illuminate elm light, restart after 5 seconds and run fine till the fault re occurred, this got more frequent until I was towing a car home and had to disconnect fuel rail sensor to get home, went to start van one day and it wouldn't start, looked on forum and tried double pin relay, connector was damaged so I wired up new relays and the van would run again, still in limp mode with fuel rail sensor disconnected, got a scrap car to swap bits over from and here's where I am now,

Swapped injectors
Swapped rail sensor
Swapped for
And it was still no better so I assumed the worst and changed high pressure pump, van started up and eml came straight on, yeah still in limp mode so I took it for a brief drive, cleared fuel rail pressure sensor fault and it wouldn't clear, turned van off to check fuel rail sensor wiring ( one pin earth, middle pin 9.3v with ignition on and other pin 4.98v, thought the 9.3 reading was strange so traced wiring to check for damage but seems ok, went to fire van back up and it won't start

Fault codes p1135, p1517, p0234, p1100, p0380, p1138 all return after cranking and p0190 won't clear, please help

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Tue 12 Jan 2016 09:06

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - hardway

Your 0190 is a code for either the pressure sensor,

the wiring or the ECU.

So that's 5V from the ECU down to the FrPS and signal out and back to the ECU.

Do you have 5V at the sensor?

And what signal V out at IG on and waht V out at cranking over?

And what are the identifying letters in the VIN?

WJY or WJZ or RHX.RHZ?

There's a few differnet varients on these and the numbers will help me pin down just which system is being used.

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Tue 12 Jan 2016 12:35

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - Peter.N.

Presumably when you changed the HP pump you also changed the pressure sensor on the back of it, the one with the with the plug, if you used the one from your old pump it could well be that.

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Tue 12 Jan 2016 20:47

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - William33

Thanks for the reply

Just went down and vin is RHZ

Fuel rail sensor test as follows with sensor connected

Ignition on Earth, 9.2 volts, 4.92 volts

Cranking Earth, 8.3 volts, 4.92 volts

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Tue 12 Jan 2016 20:50

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - William33

There is a sensor on top of the pump with 2 wires and the fuel pressure regulator, I tried them on the van from the donor car before changing the high pressure pump, so when I changed the pump I used the sensor and fuel pressure regulator from the donor car that were fitted to the van and made no difference making me think the pump needed changed

Edited by William33 on 12/01/2016 at 20:51

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Tue 12 Jan 2016 23:56

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - Peter.N.

I did something similar on my C5, changed the pump because I thought it was faulty and it turned out to be the pressure regulator, took the one off the old pump and that was faulty as well! Different faults though, the first one was making it difficult to start when cold and almost impossible when hot.

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Wed 13 Jan 2016 08:12

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - hardway

Hmm,

Not sure were on the same page here,

FRP has three wires,

checked at the ECU they're terminals 34,44,74.

Terminal 34 is ground,

terminal 44n ignition on is 5V

terminal 74 is ignition on 0.5V

engine cranking is 1.3V

and engine running at 3000RPM is 1.97V

I dont know what your testng.

Anyway the RHZ system runs a lift pump powered by the relay so I'd be testing that for running and pressure first,

If the lift pump is faulty you'l never get the fuel up to the H/P pump. and the FRP readings will be screwy.

the reading your getting makes me wonder if your checking the fuel pressure control solenoid on the pump itself?

FRP sensor is on the rail where the injector hard lines connect to,

round about the middle if I recall.

3 wire runing to it.

Check your lift pump,

open up the fuel filter housing and remove the element and check to bottom of the fuel bowl for metal debris.

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Wed 13 Jan 2016 20:59

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - William33

The lift pump is definatley powering and it's swelling the filter housing, seems to be running slightly longer than normal when priming tho but as I said earlier the van started fine 10 minutes before I switched it off to check fuel rail sensor pins, I'm definitely checking the right plug and the readings are form the pins

One is earth the middle is 9.2 volts and the other is 4.89 volts with the ignition on

One is Earth the middle is 8.2 volts and the outer is 4.89 volts when cranking

They are the readings form the 3 pins on the fuel rail sensor so it seems I have way to much voltage at the middle pin, the van will fire on brake cleaner but cut out as soon as you stop spraying it

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Wed 13 Jan 2016 21:14

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - elekie&a/c doctor

Not too sure how you can get 9.2 volts on a 5 volt system.Unless there is a fault in the wiring harness with wires shorting together.

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Wed 13 Jan 2016 23:29

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - William33

I have traced wire reading 9 volts back to ecu and it's not broken or damaged so I'm not sure either, could the ecu be at fault, the P0190 fault will not clear from the ecu

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Thu 14 Jan 2016 00:30

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - hardway

4.89V is the supply from the ECU,

Ground is of course so your 9V is the signal from the FRP,

Is an impossibility,

5V in modified by the pressure sensor OUGHT to read a changine "V" depending on the fuel rail pressure.

Typically 1.3 V when cranking.

not 9 V

so your picking up volts from another source.

one little copper strand shorting across two wires will carry that voltage and more

Try dissconecting every thing on the 5V line,

if it uses 5V unhook it and monitor the FRP sensor "9V" to look for change.

Or for that matter what does the "9V" wire read when the FRP sensor is unplugged?

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Mon 18 Jan 2016 10:59

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - William33

I have traced the wire back to the Ecu and there is no damage, the reading is 9.2volts with the sensor connected or diss one cited, the fuel rail fault will not clear from the Ecu but the other codes will

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Mon 18 Jan 2016 14:34

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - hardway

So snip the wire about 50mm from the ECU,

easy fix if needed,

then test the now short wire from the ECU for this aberant V

If the short/cut wire still has the V then it has to come from the ECU,

which isn't normal.

Nor is it 5V so there is either an ECU internal short or a short to battery voltage.

You state you checked the wire,

How?

Multi meters are useless here.

CUT the wire!!

a little solder and some heat shrink will fix that deliberate damage just fine.

You need to know where this 9 odd V is coming from.

Let me know the test result.

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Mon 18 Jan 2016 17:14

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - Micky-BO

What would be wrong with disconnecting the ecu plug & the fuel rail pressure sensor plug & load testing the wiring it will rule out any interference from another circuit.. I cannot see past the ecu fault on this 1

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Mon 18 Jan 2016 17:25

Peugeot expert Hdi 2002 - Peugeot expert fault, need an experts input ! - hardway

Me neither but to be honest I have enough trouble explaining "LOAD TESTING" to tech minded people.

never mind a "civilian".

no offense.

But I'm with you on the probable ECU fault.

Hence my cut the wire solution,

If there's still V on the cut wire it is most likely the ECU.

Wires are easy to repair.

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