C2 hdi no reving problem

[mark230678]

I recently bought a c2 1.6hdi for daughter.
Brought it back and had no end of work done to it.
Timing belt.
Ball joints
Suspension
Clutch and flywheel
Etc

Had it back from the mechanic for 2 weeks.

It started developing an intermittent rev.

Now.

It has progressed to a problem, where it starts and idles at 1200 revs. But there is no response to the accelerator.

If you drive it on the clutch, when you move into 3rd it will accelerate again.
But then top out at about 40, before losing all revs again and just sitting at 1200 revs

It has two fault codes, one is related to glow plugs.
Can't remember the other.
And they weren't scanned by a lexia.

It drove fine with these codes for a while, and these codes came a week after all the work.

The mechanic has it currently.
But can't get to the bottom of it.

If you press the brake pedal, revs drop to normal 800rpm.

Have searched and searched but can't find anything.

Does anyone recognise these symptoms.

Is there anyone local to Manchester with lexia??

All help appreciated

[mark230678]

Sorry its a 1.4hdi


I think the codes are

P2670

And

P1352

[mark230678]

Need some help again.

I have the issue back again.

I fixed by replacing the map sensor.

The issue came back, and if the plug was unplugged it would drive as normal.

Now it just sits at 1200 revs.

I have ordered a new map, but don't believe this will fix it.

There is a 2570 code.

If you press the brakes the engine revs drop.

I'm stumped now.

Desperate for some help

[RichardW]

1200 rpm is the default if the message from the throttle pedal is not right or not present. Surprised it hasn't thrown a code for it though... Cheap enough 2nd hand to just chuck another one at it, but a scanner that can read live data should show the signals.

[mark230678]

That's even more annoying then.
Because I had one and the map fixed the issue.

So I sent it back

[mark230678]

Well eventually I found the right pedal.

Swapped it over and just the same.

Sits at 1200 rpm


No response to the throttle.

When unplugging the original.
There is a sweet spot where it will sit at idle.

But if you let go of the plug it sits at 1200 again.

Also at a loss to explain why it would run fine with the MAP unplugged for a few months.

[RichardW]

Sounds like the wiring is broken at or in the plug.

No idea about the MAP!!

[mark230678]

Will have another play when I can

[wheeler]

Not sure if its the same on the C2 but on the C3 there is a connector behind the glovebox its basically an extension loom from where the car is made into right hand drive, the connector is identical to the one on the pedal & its located in the area where the pedal would be on a LHD model. On early C3's these were known to be problematic & the solution was to cut the connector out & solder the wires direct.
The C2 & C3 are pretty much identical electrically so i would imagine they are the same. may be worth chopping this connector out to be on the safe side.

[mark230678]

Cheers.

I'll give this a look as well.

Might plug accelerator in to that one see if it works

[mark230678]

No joy with the LHD plug option.

[mark230678]

Looks as though this might be going to a scrapheap in the sky.

New pedal didn't solve the problem.
Stripped the plug back.

If I use all the wires separately into the pedal.
I get revs back if I leave the green wire out.
If I plug in the green wire I get 1200 solid revs.

If the green wire is left out I have engine management fault.

Only code is still 2570
With 1351 pending

[mark230678]

On eBay now

[mark230678]

Found the plug behind glove box.
No different