The petrol engines have one on each inlet cam so the ecu has feedback from the variable chain tensioners which alter the inlet cam timing relative to the belt-driven exhaust cams. Presumably the TDI doesn't have variable cam timing so it doesn't need any more than one sensor.
There is a 60-pin connector and a 94-pin connector on the ECU so T60b is the smaller of the two. G40 is on pins 27 (5V, red/yellow), 28 (signal, white) & 29 (ground, brown). At the G40 sensor connector, with the ignition on, you should see 5V across pins 1 and 3. You'd need an oscilloscope to see the output from it when the engine is spinning.
If you get 5V at the connector then a continuity check back to the ecu on pin 2 to T60b/28 should prove out the wiring.
Last edited by MikkiJayne; 17th November 2018 at 07:29 PM.
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