Glow plug and relay fault finding

[Adam Watson]

2002 A6 1.9tdi - don't know the engine code but I think it's AWX, the sticker in the boot is missing.

It's been hard starting recently so I have been taking a look at the glow plugs. It seems they aren't getting any power. I've found the relay I think, next to the ECU top right of engine bay in a box. I've put a meter on it and when I turn the ignition on the red/ yellow wire that goes to 87a goes live but nothing at the plugs.

Any ideas? Is there a post relay fuse?

Also found a "tuning" box on the car. Took it apart and it's a 150omh resistor in a box, what's that all about?


Adam

[ametlib]

Ebay "tuning box" serial connected to the MAF, fools the ECU to believe more air is beeing drawn in than it actually is.
Most expensive resistor you can possibly buy

[Adam Watson]

OK I've been digging around a bit more.

I think I didn't make a proper connection when I was measuring voltage at the glow plugs. I unplugged the coolant sensor so the glow plugs stayed on for as long as possible. I removed a plug and made an earth straight to the battery with a cable and with ignition on the plug glowed red after a few seconds.

So what's next