Hello everyone, I need help with my ECU

Hello everyone, I need help with my ECU I think. I have a peugeot 407 with a crankshaft sensor error and there is no communication with it and I put it back.
Thanks everybody

And how do you know you have a crankshaft sensor error if you can't communicate with the engine ECM?

First of all, sorry for the writing, I am using google translator. Use autocom for errors and it tells me there is no data in or out from the crankshaft sensor. I'm sorry for the delay in answering. thank you

The crankshaft sensor is a two wire or three wire?

And how do you know you have a crankshaft sensor error if you can't communicate with the engine ECM?

The crankshaft sensor is a two wire or three wire?

3

Then it's a digital sensor, hall-effect, that produces a digital square wave signal which the ECM reads to know the speed and position of the crankshaft in the engine at all times.

Your three wires are:  - Reference Voltage (can be 5VDC or 12VDC).
                                - Ground.
                                - Square wave signal for the ECM computer.

The first two you can measure them with a regular multimeter in VDC position.
For the signal wire, you need to test it with an osciloscope meter, to check the value and integrity of the digital signal, and the most important, that it reaches the corresponding pin on the connector input of the ECM. It can be from 0 to 12VDC or 0 to 5 VDC square wave signal.

This way you will know if the problem is in the CKP sensor itself, in the wiring harness (cut wire or shorted wire to ground or power), or is the ECM that is bad.

HOW TO TEST A GM 3-WIRE CRANK SENSOR (HALL EFFECT TYPE)

Then it's a digital sensor, hall-effect, that produces a digital square wave signal which the ECM reads to know the speed and position of the crankshaft in the engine at all times.

Your three wires are:  - Reference Voltage (can be 5VDC or 12VDC).
                                - Ground.
                                - Square wave signal for the ECM computer.

The first two you can measure them with a regular multimeter in VDC position.
For the signal wire, you need to test it with an osciloscope meter, to check the value and integrity of the digital signal, and the most important, that it reaches the corresponding pin on the connector input of the ECM. It can be from 0 to 12VDC or 0 to 5 VDC square wave signal.

This way you will know if the problem is in the CKP sensor itself, in the wiring harness (cut wire or shorted wire to ground or power), or is the ECM that is bad.

HOW TO TEST A GM 3-WIRE CRANK SENSOR (HALL EFFECT TYPE)





Thank you very much for the help. I will measure those values.