Rom 0 Posted April 4, 2009 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 Share this post Link to post Share on other sites
ablister 31 Posted April 4, 2009 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 Share this post Link to post Share on other sites
Rom 0 Posted April 4, 2009 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 Share this post Link to post Share on other sites
jplautomotive 0 Posted April 4, 2009 (edited) 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 Share this post Link to post Share on other sites
ablister 31 Posted April 4, 2009 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? Share this post Link to post Share on other sites
Rom 0 Posted April 4, 2009 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 Share this post Link to post Share on other sites
jplautomotive 0 Posted April 4, 2009 (edited) 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 Share this post Link to post Share on other sites
