Hi,
on my N7BA, 96kW, 1998cc, 2005 Ford Mondeo TDCi engine, there is a MAP sensor with 4 wire connector. Is anyone able to post its wiring diagram?
1C1A-9F479-AA This should be the Ford spare part number.
Is a DC voltage the sensor's output signal or is it a square wave periodic signal which changes its frequency depending on the pressure?
Can anyone let me know the signal range according to the pressure in the intake manifold?
I measured the values below
1) GND
2) Power 5VDC
3) Vref 5VDC
4) Some 4.85VDC voltage - This voltage never changes even though I change the pressure in the intake manifold.
I got these values using a multimeter, but
when I use an oscilloscope the 4) reads 3.85VDC with a lot of negative sparks on the signal when the engine is running. Pressing the acceleration pedal increases the noise on that signal. I wonder if the 1V difference is for the much lover input impedance of the scope comparing to a multimeter. No probes used just a banana plug to banana plug test leads and 1V per division on the scope. Scope was analogue. Could it be the internal impedance of the sensor changed to a high value?
The sensor is located on the intercooler output pipe just before the intercooler hose that goes to the EGR valve.
Do you consider this MAP sensor as a faulty one?
ECM doesn't trow any pending code out to my Ford Super II Scanner regarding the MAP sensor.
Thanks