Peugeot 406 HDI Throttle Position Sensor Testing

[MadProfessor]

Good Day All.

I am trying to test a throttle position sensor from a 51 plate Peugeot 406 HDI.

The housing as the following markings.

VDO
0391
96 397 791 80
J 100498-4
PPS-4

There are four pins/wires.

Pin1 - White.
Pin2 - Yellow.
Pin3 - Red.
Pin4 - Green.

Can anyone please tell me what pin is what so I can test this unit with my DVM.

Thanks for your time.

Best Regards.

[Doggy]

Hi prof & welcome to the site.

406 wiring is more about wire no.s than colours - to get the right drawing, you need to specify the engine type exactly, but here's a typical example:

[leehdi]

EDC15c2

Pin A17 to batt negative with ignition on should read 0v
Pin A10 to A17 with ignition on should read 5v
Pin A18 to A17 with ignition on and pedal released should read 0.8v
Pin A14 to A17 with ignition on and pedal released should read 0.5v
Pin A18 to A17 with ignition on and pedal depressed should read 3.7v
Pin A14 to A17 with ignition on and pedal released should read 1.7v

EDC15c2 variant
Pin 44 to batt negative with ignition on should read 5v
Pin 22 to batt negative with ignition on should read 0v
Pin 68 to batt negative with ignition on and pedal released should read 0.3v
Pin 15 to batt negative with ignition on and pedal released should read 0.5v
Pin 15 to batt negative with ignition on and pedal depressed should read 3.5v
Pin 18 to batt negative with ignition on and pedal released should read 2v

[MadProfessor]

Sorry for the delay.

Each wire seem to have multiple numbers, but I think I know what ones you are after.

Pin1 - White - 1377.
Pin2 - Yellow - 1378.
Pin3 - Red - 1391.
Pin4 - Green - 1392.

Can anyone tell me if this TPS is a true potentiometer or another type?

Thanks for your time.

Best Regards.

[Doggy]

The schematic I posted above suggests it's a potentiometer, with integral switch.

Easiest test is hook it up to a diagnostics system - the live data will show 0 - 100% pedal movement as you operate it. Failing that, I guess your next best move is measuring between pins 1 & 3, the problem is in not knowing the correct full scale value, but if it's linear all the way with no 'dead' spots, it's probably OK