PP2000 flagged fault

Talk about the 406's electrical system, what wires do what, how to add extra functionality, etc.

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cliffk
2.0 16v
Posts: 137
Joined: Sun Jan 22, 2012 8:51 pm

PP2000 flagged fault

Post by cliffk »

2003 HDI Estate

I have a re occurring fault which I can determine using my PP2000 and I can clear it but soon after the engine management light comes back on and the fault is showing again.

The fault reads:-
Engine ECU, Intermittent fault, Accelerator pedal signal 2. Coherence with accelerator pedal signal 1.

Can anyone explain this and does anyone know a fix.

Thanks Cliff
frog
2.0 Turbo
Posts: 378
Joined: Sun Aug 24, 2014 12:18 pm
Location: Netherlands

Re: PP2000 flagged fault

Post by frog »

Your problem is in the "Accelerator Pedal Sensor", more commonly called "Throttle Position Sensor" (TPS).

It has two sliders that form a varying resistor, each of both giving a voltage to the engine management computer.

I have attached a copy of pages 66 and 67 of the document "DW10ATED Engine.doc".

The most important part:
The accelerator pedal sensor provides 2 signals (voltage).
The voltage value of one signal is equivalent to half of the other one.
Items of information from the connector channels are constantly compared with each other to detect a possible
fault.

7.3 - Electrical features.

Allocation of the connector channels:
- Channel l:Output signal 1.
- Channel 2:Output signal 2.
- Channel 3:5 volts.
- Channel 4:Earth.

Accelerator pedal released :
- Voltage between earth and channel l:0,5 volt.
- Voltage between earth and channel 2:0,28 volt.

Accelerator pedal pressed fully down :
- Voltage between earth and channel l:3,35 volts
- Voltage between earth and channel 2: 1,6 volt.
There is a diagram here: viewtopic.php?t=15673 but i think the shown symbol of a slider and a switch above "1261" is in fact incorrect. There is (afaik) no switch, just two sliders.

PSA part number is (most probably): 1920X1

Hope this helps you to solve the issue!
Attachments
DW10ATED Engine-2.jpg
DW10ATED Engine-1.jpg
DW10ATED Engine-2.jpg
Current "fleet":
2003 406 Estate 2.0HDi 110 - 7 seater - just hit 690.000 kms :cheesy:
2001 Citroen Saxo 1.6i 8v 100

Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue

PP2000 user, can help with faults / diagnostics in the Netherlands.
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rwb
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Re: PP2000 flagged fault

Post by rwb »

Good find on the docs.

But I'm not sure there are any resistors. I think it's done with magnets. Maybe some Hall effect thing.

Anyway: here's what's inside it: viewtopic.php?f=1&t=19303&p=191872

Mine ate throttle position sensors. In the end I had a cycle of two of them: one on the car, and one being cleaned up ready for next time.

Note that it will also get angry if you take up too much slack in the cable so that it doesn't quite fall to zero when you take your foot off the accelerator, e.g., when changing gear.

Current: 407 2.2 HDi 170 & C6 2.7 HDi.
Former: 406 1.9 TD; 406 HDi 90; 407 2.2 160; 307cc 180; 508 HDi 140.
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frog
2.0 Turbo
Posts: 378
Joined: Sun Aug 24, 2014 12:18 pm
Location: Netherlands

Re: PP2000 flagged fault

Post by frog »

rwb wrote: Tue Jul 30, 2019 9:29 pm Good find on the docs.

But I'm not sure there are any resistors. I think it's done with magnets. Maybe some Hall effect thing.

Anyway: here's what's inside it: viewtopic.php?f=1&t=19303&p=191872

Mine ate throttle position sensors. In the end I had a cycle of two of them: one on the car, and one being cleaned up ready for next time.

Note that it will also get angry if you take up too much slack in the cable so that it doesn't quite fall to zero when you take your foot off the accelerator, e.g., when changing gear.
Thanks for pointing out your topic. I had a good search around on the forum but failed to go back far enough...

Indeed, it seems no resistors, my bad (but inspired by the "symbol of a slider and a switch" in the SEDRE diagram :frown:). As madmadmax said in your topic: "the sensor is an inductive one - http://en.wikipedia.org/wiki/Inductive_sensor". Looks like you also tried to measure resistance but clearly is no difference between no throttle vs. full throttle.

But i guess the voltages can be read (as indicated in the document). For that the electrical connector will have to be connected and fed (powered up), possibly by putting the contact key in "Acc" or even "On" position.
Current "fleet":
2003 406 Estate 2.0HDi 110 - 7 seater - just hit 690.000 kms :cheesy:
2001 Citroen Saxo 1.6i 8v 100

Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue

PP2000 user, can help with faults / diagnostics in the Netherlands.
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