Peugeot 207, 1.6HDI, P0098, P0122, P1471

[PaskudPaskudny]

Hi,

I'm facing some problems with my Peugeot 207 1.6HDI, 2009, 90HP, 9HX motor.
First of all - engine sometimes cuts off with a "antipollution faulty" message followed by "low oil pressure" message. Sometimes "antipollution faulty" appears after turning ingition on and the car won't start. Second try usually helps. All the filters were changed to new ones, EGR is also new.
For a long time there was only P1471 error code - thats why my mechanic told me that EGR valve should be replaced. Didn't work. There is also some kind of shaking when RPM is about 800-1100 but only on 1-3 gears. Someday I managed to clean the throttle and sensors with dedicated spray (dismantled it and took home to clean properly). I was very careful while doing it. It didn't help but from that moment I got 2 other codes - P0098 and P0122. I replaced the throttle body for the other, used one with other sensors and still no changes.
I'm using ELM adapter to check for fault codes and it didn't tell me 100% info about codes.
I found a service manual for my engine and it looks like there is an electrical problem with throttle body and IAT sensor.

I have 2 questions:
1. Why P0098 and P0122 showed recently? Coincidence or something were damaged by me?
2. Where to look for that electrical problem? Is there any common area where to look for shorts? Any wiring diagram?

I'm not a mechanic, but if I can I like to do some things by myself

[GiveMeABreak]

If you need help with the fault codes, please provide 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.

[PaskudPaskudny]

VF3**************[VIN obfuscated, can be read by forum staff]

[GiveMeABreak]

Here you go:

Fault Code:	P0098
Description of Fault:	Intake air temperature signal (Air inlet manifold) : Open circuit or short circuit to the plus. The voltage of the inlet air temperature signal is above 4.902 V for more than 600 milliseconds.
Conditions for Fault to clear:	Ignition on
Downgrade Modes whilst Fault is active:	The ECU uses a replacement value for the airflow according to the engine speed and the injected flow
Symptoms:	Diesel fuel consumption a bit higher Smoke from the exhaust
Suspect Areas:	Turbocharged air temperature sensor Electrical harness Engine ECU

Fault Code:	P0122
Description of Fault:	EGR throttle position copy signal earth : Short circuit to earth. The voltage of the EGR throttle position copy signal is less than 0,1V (For 250 milliseconds).
Conditions for Fault to clear:	Ignition on
Downgrade Modes whilst Fault is active:	Deactivation of the coherence faults of the flowmeter The ECU stops the regulation of the EGR valve The ECU stops the regulation of the EGR butterfly The ECU cuts the regulation of the bypass mixer Cut in the exhaust heat recovery function Hill start assistance uncertain (Automatic mode of the electronic parking brake)
Symptoms:	Engine hesitating, cutting out Lack of power
Suspect Areas:	Air mixer Electrical harness Connector

Fault Code:	P1471
Description of Fault:	Throttle housing electrovalve control (EGR)(Principal air meter): Throttle open. Open circuit for 200 ms (Air mixer open).
Conditions for Fault to clear:	Ignition on
Downgrade Modes whilst Fault is active:	Inhibiting of the diagnostics and air flow sensor plausibility Cut of all the actuators : EGR butterfly (turbo air cooler), EGR valve and bypass butterfly (inlet air heater) in all functioning modes
Symptoms:	Lack of power Jerking/stalling Smoke from the exhaust
Suspect Areas:	Air mixer Electrical harness Connector

[PaskudPaskudny]

Thanks for that information. It says me more than service manual that I downloaded.
2 days ago I did some measurements and that's the result:

IAT:
Pin 1 (green) 5V,
Pin 3 (blue) 6,33V,

Throttle:
Pin 1 5V
Pin 2 blank
Pin 3 12V
Pin 4 3,5V
Pin 5 0
Pin 6 0

I'm not an electrician but I guess now that there's a short in the harness. I also cleaned all sockets and connectors on the BSM and ECU with "contact cleaner" (I left them for about an hour to dry completely). Does this exclude ECU or BSM? They both look fine for me.

What would you suggest as a more experienced user?
Changing ECU and BSM for other ones from the used parts market?
Or maybe some other measurements of the harness?

[PaskudPaskudny]

Hi,

I'm coming back with new information.
I measured continuity on all of the wires from IAT and throttle to ECU.

All good besides pin 4 on throttle connector (wire 1060B). It has no continuity to the M2 socket on orange connector. I checked on a wiring diagram and it connects somewhere with the wire 1382 from the fuel pump.

Is it possible that fuel pump or its wiring is damaged without giving a fault code?

I don't have access to the rear part of the engine to check it. I don't feel confident enough to dismantle half of the engine..

[undercash]

Hello

I just did an account to reply to this

"First of all - engine sometimes cuts off with a "antipollution faulty" message followed by "low oil pressure" message."

this is 100% the bsm' s fault . the engine fuse box if you prefer. The reference r09 (or 6500hw) is often faulty because of a relay inside the component. Replace with r08 (6500hv) to fix the issue.

[PaskudPaskudny]

Thanks for comment I changed the BSM last year and since then I have no problems at all. So yeah, this was the solution.

[undercash]

Yes, I m glad you fixed it, I just wanted to post so future readers would find a solution more easily.
Cheers

[undercash]

I arrived here because I m having too the P1471 dtc . and I m kinda looking for reasons to this.
but my car works 100% ok


I have had the P0122 you mentionned, the reason was a short in the air doser wiring . I ended up with the car towed from Germany to France....



but that was 6 years ago. at that time, I changed the bsm, but probably for nothing. I think it could be something again with the wiring since it was modified, I ll have to redo it again possibly .

[PaskudPaskudny]

Have you tried cleaning the throttle and its sensors? Or try replacing the throttle for the one from someone's car that works fine. Or maybe it's just the wiring like you said.

[undercash]

I have a spare one, tried it, didn't change anything. I ll try to put a spare pcm I got , who knows