Yey... get some things sorted... more things screw up.
So, it's been running like crap, hesitation and what to me sounded like diesel knock at about 2k rpm or when I give it a boot full. Managed to borrow a mates scanner this morning. Can anyone throw any light on these?
P0401 - Air Circuit. Quantity of air measured above the set point.
P0088 - Fuel Pressure regulator control. Rail pressure too high.
P1607 - Vehicle Speed limitation. Information Incoherent
Finally got a 407 coupe, but....
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Re: Finally got a 407 coupe, but....
With regards to P0401, have you checked to see if the EGR has been blanked off? This fault indicates that the MAF is reading high.
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Re: Finally got a 407 coupe, but....
I blanked the EGR off a couple of weeks ago thinking the EGR was knackered or clogged solid as the initial hesitation is horrendous when manoeuvring but blanking the EGR did make it very slightly better.... or at least I thought
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Re: Finally got a 407 coupe, but....
Ok, well then, that fault code (P0401) is to be expected as the ECU will see more air entering the MAF than it is expecting due to no intake air coming back from the exhaust. You can safely ignore it then.
Does the hesitation happen if you rev the engine in neutral or only under load?
Does the hesitation happen if you rev the engine in neutral or only under load?
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Re: Finally got a 407 coupe, but....
If you've blanked it off the ECU will complain and eventually go into backup mode reducing engine power - best to get it cleaned or replaced and refitted (plus it will keep it legal).
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Marc
Marc
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Re: Finally got a 407 coupe, but....
Dammit, stop giving me good news lol.
Looks like the spanners are coming back out this weekend then. How much of a pain in the arse is the EGR to get off?
I obviously took a pic of the codes so I had a log of them, then cleared them to run the car for a day or 2 and see what comes back.
Here's the strange thing, the cars running a lot better. Still has a massive hesitation but nowhere near as bad as it was, and only happens when I try to pull away at a decent pace as opposed to normal. And that sound which to me seems like diesel knock, has almost gone??
Looks like the spanners are coming back out this weekend then. How much of a pain in the arse is the EGR to get off?
I obviously took a pic of the codes so I had a log of them, then cleared them to run the car for a day or 2 and see what comes back.
Here's the strange thing, the cars running a lot better. Still has a massive hesitation but nowhere near as bad as it was, and only happens when I try to pull away at a decent pace as opposed to normal. And that sound which to me seems like diesel knock, has almost gone??
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Re: Finally got a 407 coupe, but....
If it is still hesitating with the EGR blanked then the problem must lie elsewhere. From what I have gathered the P0401 isn't a hard error code on the older Euro 4 engines and doesn't cause a limp mode. It's just an observation. On newer Euro 5 cars, any degradation in the performance of emissions systems has to show an engine warning light.
As I say I've had that code on my car since I bought it and can only assume my EGR is clogged in some way. It's always been present but has never caused a warning light to come on.
If you have the time it might be worth taking the EGR valve off and cleaning it; it sounds from your symptoms that it is stuck open, flooding the inlet with exhaust gas.
As I say I've had that code on my car since I bought it and can only assume my EGR is clogged in some way. It's always been present but has never caused a warning light to come on.
If you have the time it might be worth taking the EGR valve off and cleaning it; it sounds from your symptoms that it is stuck open, flooding the inlet with exhaust gas.
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Re: Finally got a 407 coupe, but....
That's why I blanked it off originally, felt very much like an EGR problem, had it on my 307 and all was well after blanking it off. Damn 407 doesn't matter if it's blanked or not.
So if that code relates to me blanking the EGR. Making me steer more in the direction of the other code for high fuel rail pressure. Any thoughts?
So if that code relates to me blanking the EGR. Making me steer more in the direction of the other code for high fuel rail pressure. Any thoughts?
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Re: Finally got a 407 coupe, but....
Ok, so you have the Delphi Injection System in your 407. The fault codes are as follows - I would ignore the last one as that will be disconnected / disabled if there are any issues with the Injection Management System. P0401 is related to the EGR being blocked (number 1 on the suspect areas list) or in your case missing as you know, so getting that sorted would be a good start. Then your Mass Air Flow Meter - checking that is all cleaned (caution with the sensor wire - you need proper cleaner for that and don't touch it with anything that will damage it).madmaxgav wrote: ↑02 Oct 2018, 16:00 Yey... get some things sorted... more things screw up.
So, it's been running like crap, hesitation and what to me sounded like diesel knock at about 2k rpm or when I give it a boot full. Managed to borrow a mates scanner this morning. Can anyone throw any light on these?
P0401 - Air Circuit. Quantity of air measured above the set point.
P0088 - Fuel Pressure regulator control. Rail pressure too high.
P1607 - Vehicle Speed limitation. Information Incoherent
As you can see P0088 relates to too high a fuel pressure - but again could be symptomatic of the other components, so working through these should help.
Engine ECU DELPHI DCM3.4 | |
Fault Code | P0401 |
After sales description of the fault code | Air system fault : Measured quantity of air higher than the setting |
Description of the diagnostics | Discrepancy for 10 seconds between the air flow setting and the measured air flow |
Conditions of activation of the diagnostics | The following conditions have to be met |
Consult the associated contexts for the Pcode forwarding conditions | |
EGR valve regulation in operation | |
Conditions of disappearance of the fault | Vehicle driven for 5 minutes, remaining below an engine speed of 3000 rpm |
Down-grade modes if fault present | Deactivation of diagnosis of coherence on the flowmeter |
Switching on of the warning lamp and/or warning message | - |
Main customer complaints likely | Noise Diesel fuel consumption a bit higher Lack of power |
Suspect areas | Electric exhaust gas recycling valve Air mixer Air flow meter Air leak after the compressor Air flow sensor information incorrect Vacuum problem Variable geometry of the turbocharger jammed in the "maximum turbocharging" position Turbocharging pressure sensor Clogging of the exhaust gas recirculation circuit |
Engine ECU DELPHI DCM3.4 | |
Fault Code | P0088 |
After sales description of the fault code | High pressure fuel regulation : The measured rail pressure is too high in relation to the set point |
Description of the diagnostics | The ECU detects a difference of 180 bars to 250 bars for 3 to 6 seconds between the rail pressure set point and the measured rail pressure |
Conditions of activation of the diagnostics | Consult the associated contexts for the Pcode forwarding conditions |
Conditions of disappearance of the fault | Driving for 5 minutes with several full load accelerations for 10 seconds |
Down-grade modes if fault present | Deactivation of processing of the accelerometry Deactivation of the accelerometry strategies Deactivation of the detection of loop difference on the fuel flow rate regulator Deactivation of the injector flow rate correction strategy |
Switching on of the warning lamp and/or warning message | - |
Main customer complaints likely | Jerking/stalling Unwanted acceleration Noise Smoke from the exhaust Lack of power Starting problem |
Suspect areas | Engine ECU (Software not up to date Poor fuel or polluted fuel (petrol, deposit, etc.) Problem on the fuel low or high-speed circuit (hose, tank, diesel fuel filter, etc.) Fuel injectors Engine fuse box Electrical harness Connectors High pressure fuel pump Fuel high pressure sensor |
Engine ECU DELPHI DCM3.4 | |
Fault Code | P1607 |
After sales description of the fault code | Vehicle speed limiter : Reference speed outside the tolerance |
Description of the diagnostics | The reference value is higher or lower than the ranges The built-in systems interface sends incorrect information on the CAN |
Conditions of activation of the diagnostics | Consult the associated contexts for the Pcode forwarding conditions |
Conditions of disappearance of the fault | Ignition on |
Down-grade modes if fault present | - |
Switching on of the warning lamp and/or warning message | - |
Main customer complaints likely | Cutting of the vehicle speed limiter |
Suspect areas | Engine ECU |
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Marc
Marc
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Re: Finally got a 407 coupe, but....
Sorry it's been a while since I last posted. Between work and my house I've hardly had time to do anything.
Looked into things a bit more and replaced the mass air flow and intake pressure sensor.
That cured the first fault on the pics I'm posting, which hasn't come back although I have blanked the egr off.
There's a couple of other codes, I'm unsure on the passenger compartment one??
And then in the final pic, just when I thought all was fixed..... new one appears about turbo solenoid. Why is it I fix one thing and another appears ffs lol
Looked into things a bit more and replaced the mass air flow and intake pressure sensor.
That cured the first fault on the pics I'm posting, which hasn't come back although I have blanked the egr off.
There's a couple of other codes, I'm unsure on the passenger compartment one??
And then in the final pic, just when I thought all was fixed..... new one appears about turbo solenoid. Why is it I fix one thing and another appears ffs lol
Intentionall Blank |
Last edited by GiveMeABreak on 22 Oct 2018, 16:25, edited 1 time in total.
Reason: Images re-ordered and placed in a Table
Reason: Images re-ordered and placed in a Table
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Re: Finally got a 407 coupe, but....
Quite happy our boss let us buy a scanner for our own cars, I'd be screwed in garage bills at this rate lol. That last fault about turbo pressure, I cleared it. If I drive "normally" it doesn't come back on. As soon as I put my foot down, not to give it a boot full, but enough to wake it up a little.. ping, it comes back on. Safe to say this car is officially doing my head in now, just want the thing right.
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Re: Finally got a 407 coupe, but....
Now I'm officially annoyed
Thought everything was well and I'd finally got it behaving as it should. Yesterday noticed a very slight hesitation again on initial start up, but after pulling away from the house it wen't away. This morning, back to it's old self, hesitation is back. Damn thing nearly got itself written off doing it as I tried to nip out quickly on a roundabout near work. I give up, don't know what the hell to do now
Thought everything was well and I'd finally got it behaving as it should. Yesterday noticed a very slight hesitation again on initial start up, but after pulling away from the house it wen't away. This morning, back to it's old self, hesitation is back. Damn thing nearly got itself written off doing it as I tried to nip out quickly on a roundabout near work. I give up, don't know what the hell to do now
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Re: Finally got a 407 coupe, but....
Any fault codes remaining now Gav? Is it just P0238?
I think I already mentioned that blanking the EGR valve will result in a fault.
I think I already mentioned that blanking the EGR valve will result in a fault.
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Marc
Marc
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Re: Finally got a 407 coupe, but....
Ok, so P0238: Turbocharger pressure signal: Short circuit to positive
This means the Turbo air pressure is not plausible and that the voltage of the signal is higher than 4.8 V for 300 ms.
Back up / Downgrade Modes
Whilst this fault is showing, the engine ECU will:
This means the Turbo air pressure is not plausible and that the voltage of the signal is higher than 4.8 V for 300 ms.
Back up / Downgrade Modes
Whilst this fault is showing, the engine ECU will:
- Deactivate the speed limiter until the next time the ignition is switched on
- Deactivate the cruise control until the next time the ignition is switched on
- Will cut the EGR valve
- Generic mode for reduced flow (so will cut power)
- Deactivate the regulation of the turbocharging (Piloted turbocharging mode)
- Noise
- Diesel fuel consumption a bit higher
- Lack of power
- Turbocharging pressure sensor
- Turbocharger position copy sensor
- Vacuum problem
- Variable geometry of the turbocharger jammed in the "maximum turbocharging" position
- Faulty turbocharger
Please Don't PM Me For Technical Help
Marc
Marc
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Re: Finally got a 407 coupe, but....
Sorry for the late reply yet again. Just this min plugged it back in. 0 codes in engine management, not a single one. But hesitation is there massively, kangaroo'd so badly earlier that it almost got rear ended by a truck pulling away from lights. Really starting to get annoyed with it now