306 Hdi Help

[Rom 0]

Seeing as the 306 forums are about as much use as a chocolate teapot...ill try here

 

Got a 99 Hdi. Had it a few months, been fine. Recently the EML came on, and it went into limp mode. Pulled the codes, had the following

 

P0335 Engine Speed

P1112 Fuel Rail Pressure

P0230 Fuel Pump In Tank Supply

P0100 Flow Sensor Signal

P1521 Clutch Sensor

P0190 Fuel Pressure SIgnal

P1404 Additional Heating 2 and Pre heating circuit

 

Ignoring the obvious ones, i went for a in tank pump, after hearing they only last about 90k or so. With the logic of if its not pumping enough, the rail wont get enough pressure.

 

Fitted, cleared codes, but P1112 Fuel Rail Pressure came back on. Rail pressure is 392 bar, not sure what its meant to be ?

 

Spoke to a Master Tech at Peugeot, who didnt seem to think the sensors go. He said more likely to be an injector, and to remove the leak off pipes, and see if one gushes fuel rather than spits.

 

So today i popped the retianing clips from the rubber pipes on top of the injectors, pulled them all off, and started it up as he said. All the injectors spat fuel from the top of them, where the pipes where. But none gushed.

However, the leak off pipes all had fuel coming out of them, even though they werent connected to the injectors ? Quite a lot of fuel too, was filling the wells on the rocked cover up !!

 

Now im not sure if they should do that ? But id expect them not to ? There job is to take un used fuel back to the rail inlet / tank (whichever it is) surely fuel should only be going one way ? And if there not connected to the injectors, they should have any fuel, let alone coming TOO the injectors !

 

Sorry for the long post.

 

Cheers

[ablister 31]

After fitting the in tank pump did it run better and eml went out or did both symptoms return?

 

fuel pressure should be about 1400 bar, could be your high pressure pump thats faulty but best to get it checked properly first as thay are expensive both in parts + labour as it's driven off the timing belt so will need stripped

[Rom 0]

After fitting, it ran no different really. Werent sure if it would self clear or not, so manually cleared codes, and just the Rail Pressure came back on ( ill assume obviously the clutch etc came on after a while, but irrelevant)

 

Seeing that it had a code for in tank pump, thats what i went for. Obviously the high pressure pump would also make sense. Not sure if it would throw a code ? Are they something common to go on them ?

 

The scanner would only pull the info from the rail pressure sensor, which could be a false reading if the sensor is faulty. Though id expect it to to not read, rather than mis read...

 

Cheers

[jplautomotive 0]

idle fuel pressure about 290 bar , it wont start to inject untill pressure reaches at least 180 in the rail

 

fuel will poor out of the leak off pipes when they are off you need to clamp the pipe off when you do that test

 

392 is the default value the ecu puts in when the rail pressure goes open circuit , and yes they do go wrong

check the joiner next to the oil filter they have a little loom with bout foot of wire then it plugs on the sensor

on bottom of fuel rail

 

jonny

 

edit , ignore the one about heating , clutch fault comes from resting foot on clutch over a certain speed. 60 mph rings a bell

Edited April 4, 2009 by jplautomotive

[ablister 31]

the way i check for a faulty low pressure pump (in tank) is reading fuel pressure and the filter. It should go up to 2 bar when ignition is switched on. But if the low pressure pump is faulty, then it won't start unlike yours.

 

Can be bad for the high pressure pumps and have seen a few being changed but best to get it checked at local peugeot garage with PPS diagnostic tool as need to see the engine parameters to see what's wrong.

 

Have also seen faulty fuel pressure sensors (the black one on the rail sticking down) so may just be that?

[Rom 0]

jonny... which pipe ? You mean just unclip one injector leak off, clamp it, and see what come out the top of the injector ? Replace, pipe, repeat for all injectors ?

 

So the sensor is faulty, or the wiring is ? For it to be displaying the default ecu value ?

 

I only had a quick look today. But saw a sensor, 2 wires, on the rail towards the cambelt end. Is that the pressure sensor ? Didnt look for any others. Just had one bolt holding it in.

 

Ill have a better look at the wiring etc tommorrow.

 

Cheers

[jplautomotive 0]

jonny... which pipe ? You mean just unclip one injector leak off, clamp it, and see what come out the top of the injector ? Replace, pipe, repeat for all injectors ?

 

So the sensor is faulty, or the wiring is ? For it to be displaying the default ecu value ?

 

I only had a quick look today. But saw a sensor, 2 wires, on the rail towards the cambelt end. Is that the pressure sensor ? Didnt look for any others. Just had one bolt holding it in.

 

Ill have a better look at the wiring etc tommorrow.

 

Cheers

 

no take all leak off pipes off inectors and clamp just before the first plastic bit

 

the sensor you saw is the return fuel femp sensor

 

could be sensor or wiring is 3 pin on bottom of rail

 

 

low fuel pressure circuit high side 2.5 bar , max 0.7 bar on the return

Edited April 4, 2009 by jplautomotive