Ccdelange said:

Does it make sense that this circuit could impact ground corrosion on other electrical components?

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No, it does not

Only got around to measuring the MAF, I got the following readings:


First of all, the blue values don't correspond to what I get from youtube videos, or forum posts. But not too worried about those. I'm surprised by the orange values. Should these values be like that, or is there an electrical problem going on potentially affecting more electrical components?

Also I'm having trouble with the TPS being the big culprit here since I've also had the problem on cruise control. That doesn't rhyme, right?

I think i've already said that, checking the MAF with a multimeter is irrelevant, you can't rely on what others found and posted on youtube cos the readings are temperature dependant too. First of all, is it 10P or 15P engine cos if it's 10P and no EGR the MAF would not affect too much, for the P1884-33 code the MAP/IAT or AAP sensors are more important cos these are affecting the torque but a diagnostic tool is needed for live data measurements. I insist that you can't find such fault with a multimeter, unless you are extremely lucky

+1 on the MAF, if it's a 10p engine just disconnect the MAF and forget it for the moment. The engine will run very well without, just not perfect.
Try to keep thinking things on a simple basis and listen to @sierrafery cos he really knows his sh!t!

Haha, thanks @Stanleysteamer and you are right @sierrafery. I read so much on the forums and get multiple sources of information, sometimes I mix up things. The one thing that struck me about the MAF readings though are the orange measurements. I thought it would hint to faulty grounding of some kind which could potentially be present for multiple sensors.

About the mechanic diagnosis today. Since it had been idle for 24+ hrs it took a while again to generate the errors. However, after heating up and asking for power, the car threw all kinds of errors again:

• 0109 --> Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent
• 0112 --> Air Temperature Low out of Range Fault
• 0113 --> Air Temperature High out of Range Fault
• The usual gearbox errors 1884-33 and 1884-18

So it seems more and more 'random' fault codes show up.

Live reading didn't show the mechanic any obvious faults. Didn't look at it myself as I was driving the car.

The repair shop replaced the fuel injector wiring because there was oil leaking, and getting into the red plug of the ECU, they cleaned it all and checked if there was oil in the ECU, which was not there. The new injector wiring didn't fix it.

Currently they are replacing the XYZ-switch with the spare one I brought, and are sourcing a TPS. Just to rule it all out.

Any thoughts on the above?

As the TPS sourcing might be a pain (Paul of Disco2parts is out until Sept. 3rd and suspected long lead times into Spain), and we're on holiday we're getting to the point of retiring the car for this holiday and have it returned to NL to fix it there. Insurance would get us a replacement ride. But it would feel a bit as a defeat to be honest.

The following codes

Ccdelange said:

• 0109 --> Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent

• 0112 --> Air Temperature Low out of Range Fault

• 0113 --> Air Temperature High out of Range Fault

Click to expand...

are pointing to what i've already said that

sierrafery said:

for the P1884-33 code the MAP/IAT or AAP sensors are more important cos these are affecting the torque

Click to expand...

So the MAP/IAT live data is what they should have followed all the way, i doubt that those mechanics have any ideea about how a Td5 works

I fear I have lost the plot a bit here.
Have you at any time cleaned and replaced the MAP/Iat sensor?
If not, DO IT. it makes all the feckin difference to how the car runs!

Just read through the whole thread.
And no, you haven't removed the MAP/iat sensor cleaned it and put it back.
Dunno why, but this sounds to me like it could be the root of the problem.
I have driven my TD5 disco with it accidentally disconnected and yep, it drives like sh!t. and that was on the flat.

Hi guys, I've ended up deciding retiring the car and have it transported to NL on insurance. They gave me a replacement car for the remainder (not a 4x4 though). We wanted to enjoy the rest of the holiday without this issue on our mind. So that's why there was some radio silence. Thanks for your understanding.

The car is back in NL now. FYI, The mechanics in the workshop in Spain have brought in a proper functioning donor Disco 2 (owned by one of the mechanics) and interchanged all kinds of sensors to check which would be faulty. However, no result: MAP/IAT, MAF, AAP, TPS. Even replaced the XYZ with the spare I was carrying. Issues persisted.

@Stanleysteamer I had done a MAP thorough clean already, however, might've failed to mention it here. Thanks for the suggestion though!

Now I'm back in NL I will resume fault finding. Will get my hands on proper diagnostic tooling to really get to the bottom of it. Seems like the proper next step.

Do let us know how you resolve all this.
Beginning to wonder if you have a wiring fault to/from the MAP/Iat sensor, that is not obvious/hidden in the loom, or at a connection somewhere between it and the ECM