Right, just intercepted the pink/red that goes from PM pin 2A to ECM, with ignition switch to On/Run and Start positions, I measure +12v.
I agree that the pin labelling must be wrong as the 'sensor ground' label in the manual doesn't make sense ?
I'm going to buy the used PM off eBay and see !
The 12v I measure could be the enable signal to the PM ?
A Very Frustrated Mick