Hello

Someone sees something that directly differ?
Receive error code P0402 after a few hundred meters. It is then from a cold start. If I zeros code when the engine is warm and running on so there will be no new error code.

Here are my 'frozen' data when the code set:

P0402
Exhaust Gas Recirculation Flow Excessive Detected

Status of this DTC
Confirmed DTC

Engine State When The fault appeared
Freeze frame trouble code: P0402
Calculated load value: 81.2%
Coolant temperature: 15 ° C
Intake Manifold Pressure: 1,10 bar
Engine RPM: 2097 rpm
Vehicle speed: 57 km / h
Intake air temperature: 3 ° C
Maf Air Flow: 48.52 g / sec
Fuel Rail Pressure: 1019.0 bar

It is a Ducato 2009 with a 2.3 Multijet 120 engine that had about 9500 Swedish mil

//Peter

The P0402 code will keep coming back until the intake manifold has been cleaned. It may be that the throttle valve doesn't open fully, the EGR valve doesn't fully close or the MAP sensor is clogged. Most probably it is a combination of these 3 elements. The manifold now contains a large amount of soot deposits that disturbs the balance between freh and recirculated air.
This is not something to ignore because fuel consumption increases sharply as soon as the fault code is present.
Search this forum for EGR issues!

Thanks for your reply!

I wonder which sensor detects the amount of soot in the intake. In many places, people are talking about DPTE sensor that senses the pressure difference in the exhaust gas, but when I search for it together with my engine, I find nothing. Incorrect DPTE is apparently common and many do clean the EGR unnecessarily or replace it. If I search for EGR here in the forum so it is certainly many tips on just cleaning the EGR.

If I loosen vaccum hose to the EGR valve, I get the same error code at cold start and after a short distance.

If I give vacuum to the EGR, the engine runs at idle much rougher. If I release the vacuum quickly, I hear a 'clunk' and the engine runs smoother. Then get a feeling that my EGR is ok. Although the valve controlling the vacuum to the EGR seems to work.

No, the tips are not about cleaning the EGR valve but about disabling it permanently.
Your engine has no sensor that detects soot, but it has an electric throttle valve which should be open all the way under the driving conditions you have specified. In your case it remains partially closed.

Yesterday I connected a PC with MultiECUScan. Then got to my surprise, a different error code:

READING ERROR CODES:
1: P010F - Air mass / air flow meters incongruence
ERROR DETAILS:
Engine temperature: 74.8 ° C
Engine speed: 782 rpm
Fuel Quantity: 2.7 mm³ / in
Gas pedal position: 0,00%
Fuel pressure: 385 bar
Boost pressure: 984 mbar
*
Possible Reasons for this error:
- Intake Duct
- Boost pressure sensor faulty
- Air flow meters faulty
The reason for this fault Is that ECU has received very high signal from the sensor. The fault is not detected now, but it is stored in memory. Clear fault codes, and observed for the future appearance of the same fault. Dashboard warning light was activated for this fault.

Here I see that I stand idle! I can not say if it had been there longer and perhaps from a device that is simpler app in the iPhone is not read by. The question is whether it belongs to my past problems and what results there in?

Maybe now I'll concentrate on the MAF instead? Or is it still the intake?

What I remember, I changed the whole inlet valve a few years ago.

In my van that has an identical engine, the problems have always originated from the intake manifold. With the MAP sensor clogged up with soot and/or the throttle valve not operating properly, the values measured by MAP and MAF may lead to more than one error code.
I once took out the MAF sensor for inspection but found it surprisingly clean.

Today I made an attempt to reach the MAP sensor in the motor home. It was instructive to tear the front and try to access it all. It was that I had to tear out the throttle body. Saw that it was exchanged for 2-3 years ago.

Had bad luck and accidentally break the MAP senor. It had oxidized down tightly. Not easy to extract the remains of the plug then. It is from 2008 and the car from 2009. There will be a new, and perhaps the one who made the error? Found a new one for £ 26 coming in the beginning of next week.

It's very fouled in the throttle body. Understand those plugs EGR completely.

When I removed the input hose to the throttle body, it was oily! Where does it come from? Is there anything that goes with from the Turbo? Here it is well just clean air?

Have no more pictures right now on the throttle body. Any comments on what I should do after the MAP sensor is mounted?

/Peter

Wonder if I managed to get some photos?

You can push down the remains of the MAP sensor and remove it with a piece of wire bent in a loop. Make sure you collect both the "nose" and the O-ring.
Now that you have removed the throttle valve you can also clean the chamber between the valve and the solenoid. Water ingress causes buildup of rust there.

Yes, it is quite messy in the intake area. I've also wondered where the oil comes from, maybe the culprit is a bearing seal in the turbine.

Oil in intake is from PCV.

Thanks!

Oil from the crankcase (PCV) before the throttle body and exhaust after (EGR) - no wonder the intake is fouled. No wonder you often have problems with dirty throttle body! - I thought it would be fresh air

When I was looking a little on the PCV so it looks like that Fiat has a more advanced. Here you spin it coming from the crankcase and allows most of the oil to drain back. The rest goes to the intake. I do not know if the oil can be seen is considered normal or whether to check the crankcase ventilation also?

New MAP sensor in place. Throttle cleaned (it was quite clean), new gaskets and assembled. The car starts and runs so well - no error code, yet. A 'stable-tip' of skilled mechanics were the MAF sensor. Have it as the next action if the new error code.

Fiat workshop wants about £ 316 for a MAF sensor! I can buy it for £ 65 in the Swedish web shop. Both original Bosch. Strangely enough, I have a different type than my Fiat's engineering numbers say and what web shop says my registration number?

Thank you for tips and advice!

Last night it was time again: Fault code P0402 back!

Now time for the next step which is the MAF sensor - attempt to clean or replace?
Powerful motor load, but it was in high gear up the hill as it happened. The car was warm this time.

A new original MAF sensor ordered, cheap. What I suspect it has been replaced with a more modern type, now HFM7 ID instead of HFM-6-6.4. It is confirmed in documents from Bosch.

Bosch also writes the following about MAF effect on exhaust-control:

In October 2009, the one-hundred millionth hot-film air-mass meter (HFM) will be produced at the Bosch plant in Eisenach, Germany. The sensor Measures the engine's air intake, independently of air temperature and density. The data provided by the HFM Provide the basis for metering the Amount of fuel injected into the engine. Achieving the right air-fuel ratio ensures That the engine hydrothermal Efficiently, Which in turn overpriced Reduces emissions. Moreover, in modern diesel engines, hot-film air-mass meters serve to control exhaust-gas recirculation.
High-precision metering and a compact design
The new generation HFM7 is available with either an analog or digital interface to the control unit. The HFM7 ice Characterized by its high-precision metering, compact design and sturdiness. Moreover, thanks to its spontaneous response characteristics, for instance after starting the engine in a vehicle equipped with a start-stop system, the HFM7 can quickly deliver reliable data Relating to the air flow in the induction tract.

- Interesting to see if the change resolves the problem of P0402.

Hi. Was your problem solver by changing the MAF sensor ?