Having a couple problems with the 6, rev counter's died, doesn't idle properly (will idle at 1500 constant), seems to be holding back sometimes when you put your foot right down, then'll kick in 100% for a second or so, then be slower again...

First trying to fix the rev counter: Checked/swapped the dials and they're fine, found the red wire (42something) in the loom by the airbox which is apparently signal from the ecu to the dials, read it with a multimeter and it reads 1v constant. Should it change with revs? Do I need to use the earth from the ecu too when checking?

The fuel pump doesn't seem to stop priming when you turn the key now either which may be related to the running probs...

Car's had new lambda/coolant/map plus has been pretty much completely rebuilt just 40k ago so think it's gotta be some electrical gremlins somewhere. Pretty desperate to have it going 100% for pugrun next week so any help or ideas would be much appreciated..

Plus can anyone tell me what the little black box behind the ECU does? could it be related to the fuel pump not priming properly?

Thanks...

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Pics of my 6
My 6 on Google Video thanks to coxy306Xsi

Anyone know if there's a sensor that could have failed which is used to get the engine speed?

All the rest of the dials work fine, just the rev counter's not working. Been intermittent for a week or so, now won't work at all.

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Pics of my 6
My 6 on Google Video thanks to coxy306Xsi

VSS is on the gearbox. Common failure apparently. Mines intermittent at the mo. Bout

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VSS has nothing to do with rev's, that's controlled by a signal from the ecu. You need an oscillascope (sp?) to check it properly as it works on frequency or something. It sounds like a wiring fault to me, although linked with poor running which could possibly be spark problems I'd also suspect the ecu. The fuel relay is controlled by the ecu also, so if the fuel pump's running continuously either the relay is sticking on, or the ecu is giving out faulty signals.

If you can find the wire that goes to the rev counter, attach another bit of wire with a bare end to it, and then tap the bare end to earth, you should get some (maybe only a little) movement on the rev counter.

Have you tried resetting the ecu?

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Oulton Park in a BTCC 306 vid 1
Oulton Park in a BTCC 306 vid 2
Lap of the 'ring

Yep, tried a couple ecu resets. The wire and the plug behind the filter looks good too, unplugged them and they look clean.

The whole speed sensor thing confuses the hell out of me, The fact that the engine is running (not too badly) means the ecu itself must know the engine speed I guess, it's just not getting to the dials ok.

Found wire 426 behind the dials and multi metered it, picked up a voltage that seemed to drop consistently as the RPM's rose, but if I need a scope to read it I guess that means nothing...

Gonna fit the new fuel relay tomorrow morning and see if that cures the engine problems, if not I'll have to start looking at the ECU.



Thanks, I'll try that tomorrow morning.

I'm also gonna try and trace wire 426 back onto the pcb of a spare set of dials I have, if I can't read the voltage I can get at the wire on the pcb I'll look for a problem inside the connector...

Thanks guys, must have jinxed it last week when I mentioned how reliable it's been.

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Pics of my 6
My 6 on Google Video thanks to coxy306Xsi

The crank sensor is what tells the ECU what revs the engine is doing, found on the top of the gearbox, with a brown plug. However, if this was faulty, the engine would not run at all....

So it must be a wiring fault you have, probably behind the dash.

Stan.

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone

Wire 426 rings some bells as being the correct wire mate

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Seat Leon Cupra FR / 306 GTI6 / Breaking 205 GTI6 / Caterham 7 / Mercedes Sprinter 311CDI LWB

Sold: Fisher Fury - Laguna DCI Estate - P1 306 XSI - E30 BMW 325i Baur Convertible - Daihatsu Fourtack - Suzuki GSXR600 - 205 Rallye

So i'm not a complete f*ckwit then?

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Seat Leon Cupra FR / 306 GTI6 / Breaking 205 GTI6 / Caterham 7 / Mercedes Sprinter 311CDI LWB

Sold: Fisher Fury - Laguna DCI Estate - P1 306 XSI - E30 BMW 325i Baur Convertible - Daihatsu Fourtack - Suzuki GSXR600 - 205 Rallye

trying not to be pessimistic but I think you're ecu is knackered. If you're having running problems and you're rev counter is faulty, and you're fuel pump is doing weird things, the ecu is the only thing common to them all. It could be a coincidence, but if there's someone near by who's ecu you can borrow I'd try that before searching for wires.

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Oulton Park in a BTCC 306 vid 1
Oulton Park in a BTCC 306 vid 2
Lap of the 'ring

Wire 426 is the correct wire which carries the signal to the tacho. Pete's right, you need an oscilloscope to meter the signal, as would do to determine injector duty cycle etc

It should be 30Hz at idle, and 100Hz at 3000RPM.

From the problems your having I would suggest a bad earth to the ECU. Either that, or as Pete said your ECU is a gonner.

Check the ECU earth which is on top of the gearbox, and check the bonding earth between the gearbox and the chassis.

Have you had your engine bay cleaned or anything lately?

I would also check the condition of terminals/pins on the ECU and loom connector.

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rich@lynxpowerengineering.co.uk
07732 822546

Glad you got it all sorted mate, weird running faults for a fuel pump relay to be the culprit.....but at least its up and running.

Stan.

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone