I have a 99.5 TDI with the ALH engine, 145K miles, history before 125K unknown. 5000 miles on the timing belt, nearly new battery. Last weekend it died while exiting an expressway in Brooklyn at the end of a 240 mile drive. I managed to get it to run in a couple of short bursts to a parking spot, where it stayed. It felt like no fuel although the tank was only 240 miles from full, and showing 7/8 on the fuel gauge. I changed the fuel filter, no change. I purchased a code reader and came up with P1354 Modulation Piston Displacement sensor electrical circuit malfunction. I unplugged and reattached plug 10, no change. Time for the 240 mile tow back home.
Once home I checked the resistance of the sensor coils at P10, and they were with in reason (about 5 ohms each). I also reseated the plug on the ECU, still no change.
Time for VagCom. Block 1 Modulation piston displacement reads 5.040 (vs 0.740 on my wife's car). I removed the top cover on the fuel pump and rotated the solenoid by hand, the reading did not change.
I can not find a pin layout for the ECU plug so I can check the wiring between the ECU and fuel pump.
Does anyone have any data that would allow me to check the wiring and know a way to simulate a known piston displacement at the fuel pump plug so I can see if the pump, wiring or ECU has failed?