 | Home > Puma (Tdci) > EGR fault code - Problem? |
 
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| clifflandy Member Since: 13 Mar 2014 Location: Lichfield Posts: 109   
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I don't know about the fault code - mine has not shown that one but in the cold weather my 2007 Puma turns over on the starter for 5 seconds before starting with a puff of smoke from the exhaust. Idling is a bit lumpy for a minute or so.
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2nd Feb 2015 11:37am |
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| x-isle Member Since: 26 May 2011 Location: Midlands Posts: 1327  
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I'm assuming you have not had your EGR disabled on the ECU.......
When you switch your engine off, do you hear the usual "Chugga Chugga Chugga Chugga" about 1 second after shutdown? That's the EGR self cleaning, if you don't hear it, there's your problem. Although it could still be self cleaning, but still not be operating properly. It's probably that your EGR is starting to clog up and could fail. Not an issue unless it sticks open as it'll probably stall when you idle and won't restart until it closes again. It normally gets louder and louder as it's starts to stick more and more. This will probably start the debate about getting it blanked off, removed, etc......... That's up to you as there are split decisions on it (please no more, there's plenty of discussions on it already). It either needs a replacement one (around £100) or you can clean it out or indeed get it disabled. I replaced mine about 2 years ago, and I think it's started to clog up again as I have a bit of a flat spot occasionally at around 2,000 rpm when the engine is warm. This is a tell-tale sign of the EGR starting to get clogged up. Craig Rogers 2007 Puma 110 XS 2011 Evoque Coupe Dynamic Lux www.craigrogers.photography |
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2nd Feb 2015 11:55am |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1776  
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Mine felt like it was an old petrol engined car with a manual choke - it felt strangled then a puff of smoke and it would be much better but a bit lumpy.
I fitted a EGR blank plate, (you can get them very cheaply off ebay) and an easy fit and it transformed the drive - worth trying, but it will put on the amber MIL light. Keith |
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2nd Feb 2015 11:59am |
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| v8bobber Member Since: 26 Aug 2012 Location: pembrokeshire Posts: 444 
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I haven't had the EGR blanked off no and it does go through a cleaning process whenever the engine is switched off.
I am not too chuffed with the lumpiness when cold as I don't get to drive it that often and for a relatively short journey most of the time. I haven't used it long enough for the short journeys to start clogging things up as I've only had it a week or so. Just doesn't seem right somehow. I assume that blanking the EGR will show if that's where the problem is? Am I right in saying that the I will need something like a Pete Bell remap to enable the ECU to be told that there is no EGR and have the MIL turned off? Dave |
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2nd Feb 2015 12:18pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17318 
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An untested DTC is one which may or may not indicate a fault, its presence means that the ECU hasn't yet been able to test that the component is working. Untested DTCs tend to come and go as components function (or become tested DTCs if they really are malfunctioning), they'll also typically clear after a certain number of ignition cycles.
The P0404 does, if it persists, tend to suggest that the EGR valve is not working as it should, but this could be a red herring. You could, if you have the equipment to clear faults, try unplugging the electrical connector from the valve to see if the engine then idles properly. It will produce a persisisted fault code and illuminate the MIL, which however, so make sure that you have the tools on hand to clear the fault. There are other faults which could cause the symptoms you describe without necessarily producing DTCs, such as a faulty VCV, or a faulty CHT sensor. I have replied to your PM, by the way, sorry for the delay!  |
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2nd Feb 2015 12:42pm |
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| Dave-H Member Since: 08 Feb 2011 Location: Surrey Posts: 1507  
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P0404 is just about the most common EGR fault code on all vehicles lol, I see it weekly.
Usually a simple 'Erase codes' is an end to it and it doesn't re-appear, but as said, most likely cause will be a dirty EGR. Just erase the code, and see how it goes .... Guns and Landrovers .... anything else is irrelevant. |
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2nd Feb 2015 2:35pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
If the valve sticks even slightly when in operation (they all do) it throws the values out that are monitored by the PCM and that raises the common dtc of P0404-72 or -73 whether the valve is stuck open or closed. As it is a permanent non tested DTC that is not illuminating the MIL light I would just reset and clear the DTC and not give it another thought. If the MIL illuminates and you get a P0404 tested DTC then there is an issue and it will need to be investigated. There has been a lot of issues with the EGR valve and as long as you hear the cleaning cycle when you shut down you know the valve is working. If you hear the cleaning cycle at shut down, sounds like chukka chukka you could disconnect electrically the EGR valve as it should be closed and see if that helps any with the idle at start up. Another point to consider is that the engine will sound and run better as you have basically disabled the EGR valve and no recycled gases are being sent back into the combustion cycle so you will get a cleaner burn. Some DTC results from my Puma over the years:
NANOCOM - PUMAENG.APP - PUMA ENGINE fault file 068A - 00 Engine control module (ECM) power relay deenergized - too early --- 0606 - 49 Engine control module (ECM) processor internal electronic failure --- 0404 - 72 Exhaust gas recirculation (EGR) control circuit range/performance actuator stuck open NANOCOM - PUMAENG.APP - PUMA ENGINE fault file 0404 - 72 Exhaust gas recirculation (EGR) control circuit range/performance actuator stuck open --- 0606 - 49 Engine control module (ECM) processor internal electronic failure --- 0299 - 00 Turbocharger A under boost condition --- 0100 - 29 Mass or volume air flow A circuit signal invalid --- 1103 - 00 Mass air flow (MAF) sensor in range but higher than expected --- 0234 - 00 Turbocharger A over boost condition --- 1402 - 17 Exhaust gas recirculation (EGR) control valve metering orifice restricted circuit voltage above threshold --- NANOCOM - PUMAENG.APP - PUMA ENGINE fault file C001 - 88 High Speed CAN Communication Bus --- 1643 - 87 Controller area network (CAN) link engine control module/transmission control module circuit/network --- 0404 - 73 Exhaust gas recirculation (EGR) control circuit range/performance actuator stuck closed --- 0299 - 00 Turbocharger A under boost condition --- Every single one of the above DTC record is a non tested DTC and can be explained by what I was doing at the time to the Puma. An explanation of what a DTC is: There are basically two types of DTC codes for OBDII Diagnostics: Emissions related DTC's Tested DTC's Type A 1. Emissions related. 2. The Malfunction Indicator Lamp (MIL) will be illuminated as soon as the error occurs. 3. Stores a freeze frame DTC after one failed driving cycle.( history DTC is stored ) Type B 1. Emissions related. 2. Sets a Pending Trouble Code after one failed driving cycle. 3. Clears a Pending Trouble Code after one successful driving cycle. 4. Turns on the MIL after two/three consecutive failed driving cycles. 5. Stores a Pending Trouble Code as a DTC after two consecutive failed driving cycles. Conditions for Clearing the MIL/DTC – Type A or Type B The MIL will turn off after four consecutive driving cycles in which the diagnostic runs without a fault. A history DTC will clear after 40 consecutive warm up cycles without a fault. DTC(s) can be cleared by using a scan/diagnostic tool. Non–Emissions Related DTCs Un Tested DTC's Action Taken When the DTC Sets 1. The Malfunction Indicator Lamp (MIL) will not illuminate. 2. The ECM will record a DTC at the time the diagnostic fails. Conditions for Clearing the DTC A history DTC will clear after 40 consecutive warm up cycles without a fault. DTC(s) can be cleared by using a scan/diagnostic tool. How to read a DTC Code The DTC value will help you narrow down the specific component or module in question. A DTC has a standardized format that can be interpreted as follows: The first part of the DTC is the Alpha Designator. The alpha designator will be: B - Body electronics (i.e., door and hood latches) C - Chassis (i.e., traction control or ABS) P - Powertrain (i.e., engine, transmission) U - Network communications for the different control modules Second Digit - Code Type The second digit identifies whether the code is a generic code (same on all OBD-II equpped vehicles), or a manufacturer specific code. 0 = Generic (The diagnostic codes that are required by law on all OBD II systems are "generic" in the sense that all vehicle manufacturers use the same common code list and the same 16-pin diagnostic connector. Thus, a P0301 misfire code on a Ford means the same thing on a Vauxhall, Citroen, Toyota or Mercedes.) 1 = Enhanced ( Each vehicle manufacturers also have the freedom to add their own "enhanced" codes to provide even more detailed information about various faults. Enhanced codes also cover non-emission related failures that occur outside the engine control system. These include ABS codes, HVAC codes, airbag codes and other body and electrical codes.) Third Digit - Sub-System The third digit denotes the type of sub-system that pertains to the code 1 = Emission Management (Fuel or Air) 2 = Injector Circuit (Fuel or Air) 3 = Ignition or Misfire 4 = Emission Control 5 = Vehicle Speed & Idle Control 6 = Computer & Output Circuit 7 = Transmission 8 = Transmission 9 = SAE Reserved 0 = SAE Reserved Fourth and Fifth Digits These digits, along with the others, are variable, and relate to a particular problem code error number So let's diagnose a DTC, I've picked P0404-73 EGR control circuit range/performance: actuator stuck closed so we have: P = Powertrain (engine, transmission) 0 = Generic 4 = Emissions control 0 4 =This is the specific error code within Emission control. In this case the EGR control circuit range/performance -73= This is a specific problem, in this case the actuator is stuck closed. 72 means its stuck open. So if the DTC P0404 was present along with a MIL light then it has failed the emissions related self test cycle which means there is a high likelihood of an issue to investigate. HTH. |
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2nd Feb 2015 10:19pm |
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