grinem

I have a quick question relating to my 84 928s Aussie, on the 6 pin MAF, what are the ohm values across all 6 pins, can anyone point me to the tech data or post the info, I already know 3 to 5 and 2 to 6 but what are the rest and what is the grnd point, is there a grnd point, the book just doesn't go deep enough.

cheers all

John Speake

Pins 3 & 4 are both ground. Pin 2 receives 12v when ignition is on. Pin 1 receives the burn off signal from the LH when the engine is shutting down.
Pin 5 is the output to the LH ECU, which varies from about 2.7v at idle to >4v at WOT.

grinem

Thanks John but I'm after each individual ohm value when the maf is at rest, I'm just trying to compare the readings from a new one to mine, also John I've read a lot things around the traps about the pot and how many times you can screw it in and out, it seems to me that it has only around 8. 5 turns between it's lower and higher ohm value, is that correct?

John Speake

It's not meaningful to measure ohms reading on pins like +12v and burn off. The reading between 3 & 5 is valid as this is a resistive element.

But even that has manufacturing tolerances which are taken into account when it is calibrated.

I understood that the idle mixture pot was 20 turns end to end although I have never checked it myself. I've just checked the data sheet and it is 15 turns.