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Can you give us at least EDC, or the VIN Number (ideally the latter), VIN starts with VF3........... or VF7.............
And does it have start/stop or not, PSA were running with and without these systems.

Once have this check into testing and publish, if I have information about the system.

Also, can you post a picture of the engine, with cover off, what I want to look at is the CCV system (smaller pipe leading from valve cover back to intake system), because I already have ideas about the DTC and what it is.

 

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PEUGEOT Boxer III 2.2 HDi 130 PUMA C (4HH) 2011 - Onwards

Variations during production and known ECU's

VF3YCTMFC12770814 (sgg.asia) for OEM part numbers and exploded views.

Vehicle characteristics

​ Model: Boxer 3 Body: GLAZED VAN LWB H2 TYPE 16 Engine: DIESEL TURBO PUMA C 96 EURO5 130HP Transmission: BVM6

DTC P0234 Engine Overboost

Try cleaning the MAP sensor first with petrol or suitable solvent (take note of the conditions you find it, looking for excessive oil at this point from CCV system, another spot to check is just after where the pipe enters the intake system from the CCV, this system rarely throws DTC codes). A new MAP is not usually expensive but wiring to it might be the issue.

Also, we should look at this TURBO CHARGER only as a FYI subject at this point - the solenoid control for the vanes can be replaced rather than the whole turbo assembly and proper testing should be done to confirm that whole turbo replacement is needed. Generally, all intake hoses associated should be checked for any leaks / splits and undone clamps (had the last point happen on my engine - one didn't find until do the timing belt @ 100,000km and not sure if it was leaking or if was, didn't notice). Diagnosis can usually see this, not that throw DTC unless goes beyond what ECU can correct, and would show as positive trimming of the injectors, when at idle, which brings you looking for leaks.

Nearly always you see DTC for injectors when there is fault condition, so agree with your points above. In that, I would expect the ECU to know if lost control of an injector and to DTC, otherwise we are back to carbies, and why bother with the electronic control at all.

If you do find excessive oil, bring us looking at the CCV system employed (not looked into it yet) and will pool in the lowest point of the intake system, often the intercooler itself, can cause issues other issues. Our engines are similar, not identical, which is why just link my post about the summary issue I had with CCV (closed crankcase ventilation) system in use on it, 4007 Post #6

The ECU must account for all air in the system, which is why called CCV and not PCV system. They are basically similar systems, apart from this.

The below is electrical testing to determine a fault does not exist between the ECU to the sensor or control object associated with DTC P0234, this from Haynes 2018.1 VM, laid out in the order they say to check for possible cause and added few things I would go looking for above, in combination to the electrical testing.

INJ CALCULATOR SENSOR are the sensors in play with ECU for controlling the engine.

(1) Variable Nozzle Turbine Motor

(2) MAP Sensor

 

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PEUGEOT Boxer III 2.2 HDi 130 PUMA C (4HH) 2011 - Onwards
E1 - ECU (1320)

I don't have pin-out graphics for this ECU, but the above is the full listing of all pins from the ECU. If these don't match up, will need to switch Peugeot wiring diagrams (SEDRE), will need the DAM/RPO details, and we can figure out the best way forward.

Hope you find this useful.

 

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I think you may be losing control of the air in the system, and the MAP sensor is used to make these final trims. I think air/fuel ratios are being lost. Which is similar to theory about injectors, except the testing seems to suggest they are working, proper diagnostics with Lexia would be useful as we could see what the ECU is seeing.

I'm just taking a different approach based on the DTC information given to date, and nothing suggesting injectors are the issue to me. We need to focus on clearing the codes first as ECU is clearing saying it does not know what is going on, either between the control of the turbo or the sensor that it uses.

Things like Lexia or equal for diagnostics, can give you live data while driving to see what the ECU is doing or trying to do or tell you why the ECU is getting it so wrong, and you are losing power. If the above testing does not pan out to find the fault, you're going to need the proper diagnostics to get to the bottom of this.

The CCV nature of the system means it is critical that it correctly knows the exact amount of air in the system, going to the cylinder.

 

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Did you test the wiring for Variable Nozzle Turbine Motor ?
Have you run diagnostics and tested it functional control / actuator test ?
Open the inlet side of the turbo and looked at it ?

I decided to pull out an injector and noticed that the injector body was covered in oil. Surely this is not normal?
Would this mean most likely my copper injector seals have failed?

Sounds like you caught leaking before that oil, starts turning into glue, and holds the injector in, giving you a new lifting lug for the vehicle, which is a good catch.

Washer looks like items 15,14,17. Item (3) seems better than some other designs, don't think it will be an issue, the fork ones can bend and not supply enough downward pressure.

The bolts used to hold the injectors are not stretch bolts. So unless damaged, no reason they can't be reused. The holder clamps should be checked over, but as mentioned think they will be fine.

Hope you find this useful. Happy New Years.

 

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You are reading the correct information.
Just check them for damage before reuse.

 

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ECU for the variable nozzle turbine motor please

It is the ECU - E1, and was covered in Post #4 via the inj calculation sensor link


Item 1 is the ECU

 

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It is Variable Nozzle Turbine, the actuator varies the vanes, using proper diagnostics, so in Lexia, go into the ECU and then actuator test, you can check the actuator movement. So this does no turbo (flow through) through to the highest boost, by moving the vanes.

 

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Peugeot wiring diagrams.

Engine Electronics
without start stop function:-

with start/stop function:-

PEUGEOT ALL MODELS WIRING DIAGRAMS - GENERAL
PSA Electrical Diagrams - Wiring & Symbols Codes Index - French Car Forum