Speed control system faulty

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w4rrick
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Joined: 09 Apr 2019, 17:28
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Speed control system faulty

Post by w4rrick »

Hi all, I was hoping someone out there could shed some light on this problem.

I have an error message popping up, "...Speed control system faulty" When it happens the engine loses power and runs proper ropey! Also, the tick over increases to around 1300 and is very uneven??

When I touch anything on the cruise control stalk the message is repeated (as it is only displayed for a few seconds initially). The engine runs normally once I have pulled over and switched the ignition off and on again. It can be minutes or hours between the error messages popping up and I can not identify any driver or environmental causes- eg...harsh acceleration/wet-hot weather ect....

Its an 07 plate 407sw sport on 60000 miles and otherwise runs perfic.

Any advice/ideas appreciated.

Thanks peeps...Warrick.
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Re: Speed control system faulty

Post by GiveMeABreak »

Hi Warrick - When there is a problem with the fuelling / air / emissions / the Injection ECU will go into a backup mode depending on the issue. This will limit your power and disengage cruise control and some other functions depending on the fault.

The best thing is to get it read with Diagbox and post up the fault codes, then we will be able to assist further. There are too many possibilities without the fault code. We do have a member list with those offering to help with a Diagnostic:

viewtopic.php?f=19&t=56452

At the end is link to a Google map showing where the members on the list are. If you find one, send them a private message, but be aware that not all of these are on the forum all the time.
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Marc
w4rrick
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Joined: 09 Apr 2019, 17:28
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My Cars: 407 SW 2.0 HDI

Re: Speed control system faulty

Post by w4rrick »

Thank you kindly Marc, I appreciate your help. I will try and get my mits on the fault codes and pop them on this thread.

Again, Thank you.
w4rrick
Posts: 6
Joined: 09 Apr 2019, 17:28
Location: Wirral
My Cars: 407 SW 2.0 HDI

Re: Speed control system faulty

Post by w4rrick »

Hi, hope you're still with me.

I have 2 fault codes P12A5 & P0087

Googled it and I ain't got a clue, any ideas??
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Re: Speed control system faulty

Post by GiveMeABreak »

Pop your VIN up here so I can determine codes as they relate specifically to your engine ECU Warrick.
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Marc
w4rrick
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Re: Speed control system faulty

Post by w4rrick »

Cheers Marc, appreciate your support.

VF3**************[VIN obfuscated, can be read by forum staff]
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GiveMeABreak
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Re: Speed control system faulty

Post by GiveMeABreak »

Ok, so you have the DW10BTED4 138 Engine with Delphi 3.5 Injection ECU. Here are the 2 fault codes and their descriptors:

So initially it would seem you have a problem with Injector No 2 - which may or may not be a factor in the second fault P0087.

So at least you have a few pointers now.
Fault codeP12A5
After sales description of the fault codeCorrection of injector flow rate cylinder 2: Injector jammed closed or cylinder problem
Description of the diagnosticsThe ECU compares the flows injected by each injector individually.
The fault is returned if the injector has a flow which differs by more than 5 mg/stroke in relation to the other injectors for 1 minute (at idle)
Conditions of activation of the diagnosticsFlow injected more than 5 mg/stroke at idle
Conditions of disappearance of the faultDriving for 5 minutes
Down-grade modes if fault presentDeactivation of processing of the accelerometry
Deactivation of the speed limiter
Deactivation speed limiter until the next time the ignition is switched on
Deactivation of the cruise control
Deactivation cruise control until the next time the ignition is switched on
Deactivation of the accelerometry strategies
Switching on of the warning lamp and/or warning messageNo OK
Main customer complaints likelyLack of power
Noise
Engine hesitating, cutting out
Starting problem
Suspect areasInjector: Mechanical failure (Injects too much)
Injector: Electrical failure (Jammed open)
Compressions: Incorrect

Fault codeP0087
After sales description of the fault codeHigh pressure fuel regulation: The measured rail pressure is too low in relation to the set point
Description of the diagnosticsThe 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 diagnosticsConsult the associated contexts for the Pcode forwarding conditions
Conditions of disappearance of the faultDriving for 5 minutes with several full load accelerations for 10 seconds
Down-grade modes if fault presentDeactivation of processing of the accelerometry
Deactivation of the speed limiter
Deactivation speed limiter until the next time the ignition is switched on
Deactivation of the cruise control
Deactivation cruise control until the next time the ignition is switched on
Request for Delayed Engine Stop
Deactivation of the accelerometry strategies
Switching on of the warning lamp and/or warning messageWarning lamp MIL
Main customer complaints likelyJerking/stalling
Diesel fuel consumption a bit higher
Fluid leak/smells (diesel fuel, oil, etc.)
Lack of power
Starting problem
Suspect areasEngine 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 injector
Electrical harnesses
Connectors
High Pressure Fuel Pump
Fuel pressure sensor
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Marc
w4rrick
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Re: Speed control system faulty

Post by w4rrick »

Can you think of anything specific that would connect the 2 faults?

eg.. Could a faulty injector ["Correction of injector flow rate cylinder 2: Injector jammed closed or cylinder problem" (albeit intermittent)] cause ["High pressure fuel regulation: The measured rail pressure is too low in relation to the set point"]?

Just an example.....What I am asking is if (with your experience) anything jumps out at you that might narrow it down??

Sorry to be a pain Marc, and thank you.
w4rrick
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Re: Speed control system faulty

Post by w4rrick »

Sorry Mark, I did not read your text above the tables.

Thanks kidda.
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Re: Speed control system faulty

Post by GiveMeABreak »

Yes the common item would seem to be injector 2 Warrick. You may be able to get it tested by a diesel specialist to confirm though.
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Marc
quantra007
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Re: Speed control system faulty

Post by quantra007 »

citroen c5 2.2L turbo diesel model 2005
fault code: P1351 manufacturer control
What is mean and how to fix that?
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