C4 2.0 Blue Hdi, P1632 47 code

[onthecut]

Here's hoping someone can identify this specific variant of the code, please. (P1632 47)

Pulled out to overtake with a fairly wide throttle in top gear and the car significantly faltered two or three times and brought up the 'engine repair needed' message. Curiously however, no sign of the engine management lamp.

The car is now (I presume) in limp mode --- drives like the turbo is off. It's not -- or at least the diagbox test says it's OK. Have done all the air intake tests on D'box and they've come up all good.

Any thoughts welcome.

Thanks, Mike.

[onthecut]

Quick update --- dug down in Diagbox and found the 'report' section. That tells me the fault was a temporary internal ECU fault, which occurred at 100% throttle at 130kmh. Had a look then at the voltage readings for the thottle pedal. Apparently there are two tracks and on mine, while one went up and down depending on position from 0.4 ish to 0.9 ish, the other seemd to stay pretty static in the .4 region. Anyone any idea what figures I should expect to see here ?

Mike.

[GiveMeABreak]

I'll need your VIN. Please post your VIN in full without spaces - it will be automatically masked from public view after submitting your post & will only be visible to staff.

[onthecut]

Hi Marc.

It's VF7**************[VIN obfuscated, can be read by forum staff]

Many thanks. Mike.

[GiveMeABreak]

There's no actual explanation other than the fault is with the Engine Management ECU. It only states an internal electronic fault in the ECU. Possible suspect are the Engine management ECU itself, the Electrical harness or the connections.

So I would start checking the connectors tot he ECU, especially if any work has been done on the car battery or anything else where the connections may of been disturbed first of all. Have you gone over a bad pot hole recently?

[onthecut]

'Have you gone over a bad pot hole recently?' You mean there are days when you dont ??!!

Yes, the ECU has been out or disconnected a couple of times -- clutch change; battery management unit replacement etc. Didn't notice any issue with the harness, but I guess things can change.

Do you happen to have the data on what readings are to be expected from the throttle pedal by any chance ? --- I did wonder if it might be glitching at the limit of its travel, given it will be a less used part of its travel .

Thanks for your help and suggestions.. Mike.

[GiveMeABreak]

'Have you gone over a bad pot hole recently?' You mean there are days when you dont ??!!

Indeed.

That won't be it because there are specific fault codes for anything to do with the data from the accelerator. There are 2 tracks of data that are compared for reference and if these do not compare, then it throws a very specific code up, which you haven't reported.

The code you have is specific to the engine management ECU.

[gooroo]

@onthecut, hi, did you ever get to the bottom of your P1632 fault, have a 2019 DS7 with the same code that will not clear, also lacking in power.

Regards, gooroo

Code: Select all

Inspection Result
Built-in System Interface (BSI) 2 problems exist
1.B120A Collision Risk Alert Function Fault
Intermittent
2.B120D Automatic Braking On Risk Of Collision
Function Fault
Present
Engine System 1 problems exist
1.P1632 Engine Management ECU. Internal Fault
Permanent Fault
Multifunction Video Camera(CMF) 1 problems exist
1.U1108 Communication With The Engine
Management ECU
Permanent Fault
Audio-navigation Or Telematic Unit Or Connected Audio System 1 problems exist
1.B1003 Secure Configuration
Permanent Fault
Touch Screen 1 problems exist
1.B1576 Secure Configuration Of The Multifunction
Touch Screen
Permanent Fault
Windscreen Wiper 1 problems exist
1.B100C Wipers ECU Supply
Intermittent
The following systems are OK:
1.Anti-lock Brake System
2.Air Bag
3.Battery Charge Status Unit
4.Air Conditioning
5.Instrument Panel
6.Rain/Light Sensor
7.Steering Wheel With Integral Controls(Vci)
8.Electric Power Steering
9.Multiplexed Control Panel
10.Switch Module Under The Steering Wheel(Top Of Column)
11.Service Module
12.Siren
13.Seat Belts Not Fastened LED Unit
14.Signalling Fuse Box
15.Alarm
16.Parking Assistance

[onthecut]

Hi Gooroo.

The short answer, I'm afraid, is 'no'. Curiously, I still have the problem, but the code has stayed disappeared since I last wiped it. I've now learned to live with the issue by avoiding sudden full throttle opening in top and sometimes 5th gear. If I forget, then providing I back straight off as soon as the first cut out occurs, it all immediately comes back to life -- no fault code and no limp mode. Keep the throttle planted a second or two longer however and there is a very temporary return to life, followed by another outage. After a second such occurrence in the same cycle, it will go into limp, but won't put up the engine fault lamp.

Does your code reader give you the additional pair of digits on the end of the code ? They may help to throw some light on the cause. One quirk I have discovered over the last few months is that if you don't reset the service indicator as required, that may cause a limp issue. Although I've done thr requisite service jobs, just hadn't bothered to reset it. One day, got an oil dilution permanent fault code, that wouldn't clear. Changed the oil, still wouldn't clear. Limp mode. Reset the service counter -- fault and limp mode gone.

One absolutely basic thing to check is the condition of the battery. A poor battery, or duff voltage for some other reason will potentially cause all sorts of mayhem.

Good luck with it.

Mike.

[jferreira]

Hello,

I also have this issue on a Peugeot 308.
I guess you have never found the problem?

[onthecut]

Hi jferreira.

No -- afraid I haven't found an answer. Just have to remember not to floor the pedal when overtaking.

Mike.