Peugeot 106 1.6 16V '97 TU5J4 NFX

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MHTSOS
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Peugeot 106 1.6 16V '97 TU5J4 NFX

Post by MHTSOS »

My best friend finally decided to put an MRE on his daily driver.

The car had initially a 1.6 8v TU5J2 NFW 105hp that was swapped out with a 1.6 16v TU5J4 NFX 120hp from the scrap yard.
I'm trying to locate a wiring diagram with the ECU pinout for this engine but all I can find is this http://www.autoelectric.ru/auto/citroen/saxo/nfx/nfx.htm but it shows a hall crank position sensor and the engine we have has a VR.
Searching on Autodoc to see what kind of spare part comes OEM confused me even more because for this engine it give both 2 pin and 3 pin sensors and it also gives cam position sensors but our engine doesn't even have one.

Do you know any source for wiring diagrams that could help?
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MHTSOS
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Re: Peugeot 106 1.6 16V '97 TU5J4 NFX

Post by MHTSOS »

Did some wiring tracing on the car and turns out that the schematic I found is mostly correct. Some differences in wires could be because of the different chassis but they are easily rectified.
Trigger wheel is 60-2 with a VR sensor.
Dwell time in idle for ignition coil is 5.1ms.
Next time I will measure injector dead time with a current probe.

To the questions now.
As you can see in the wiring the injectors are wired in pairs. Is it possible to connect all 4 injector drivers of TLE8888 and fire them in pairs so that I won't exceed 2.2A of their current limit? Solved.
Has anyone tried to drive an idle stepper motor from TLE8888? If not I can wire in an external stepper driver board like Frankenso since I already have one.
Stock ECU has a VSS input from a sensor that seems to be directly powered from 12V so I assume its output is 12V square wave. I can double check with the oscilloscope at a later date because I need to dig out the wire from the harness.
If I wanted to feed this signal to MRE where should I connect it? I'm thinking of putting a resistor and a 5.1V zener and feeding it to an analog input.

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Last edited by MHTSOS on Fri May 14, 2021 9:08 pm, edited 3 times in total.
Gepro
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Re: Peugeot 106 1.6 16V '97 TU5J4 NFX

Post by Gepro »

The VSS with 12v is probably an hall sensor, but they aren't all the same.

Basically, an hall sensor has 3 wires, +12v (or 5v), Ground and signal. The signal is commonly a ground signal, so you have to put a pullup for testing (commonly a +5V with a 1 - 3K ohms resistor) You will have a square signal. ( 0 to 5V with a +5V pullup, even if the sensor has +12v)
But sometimes, the hall sensor already has a pullup, and use the +12v to send a positive signal.

The cam input signal from MRE is designed for hall sensor, and has a inboard +3.3v pullup, you just have to plug the signal to it if your hall sensor is "common"
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MHTSOS
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Re: Peugeot 106 1.6 16V '97 TU5J4 NFX

Post by MHTSOS »

I took more measurements and without the ecu plugged in I have 7V on that pin so it seems it has a pull up to 7V inside the cluster. Same goes for the rpm signal to the cluster.

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Gepro
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Location: France

Re: Peugeot 106 1.6 16V '97 TU5J4 NFX

Post by Gepro »

Can you try with +5V instead of +12V ?
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