Jeep RENIX differential mag crank sensor signal

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vprtech
Posts: 6
Joined: Tue Apr 30, 2013 11:26 pm

Jeep RENIX differential mag crank sensor signal

Post by vprtech » Tue Oct 30, 2018 12:57 am

Hello, I'm working to try and simulate, at least the crank signal, for use with a OEM Jeep Renix ecu for bench testing. What I've found is that the crank input and output are biased by about 4-6 volts. If VR- is tied to sensor or battery ground with a running engine, the engine dies. The ecu will run the engine without the cam trigger in batch fire mode, but even then, I have not been successful simulating a crank signal that the ecu recognizes. I cannot find a datasheet on the VR chip, but I'm considering using the oscilloscope to probe each pin to see if I can find its output, and then just bypass the chip altogether for testing work on the bench. Before I do that, I thought I would post up to see if anyone had any ideas or possibly has already had success triggering the factory Renix ecu using JIMSTIM. Any input is appreciated.
Attachments
crank signal only between VR- and VR+ Jeep Renix.JPG
crank signal only between VR- and VR+ Jeep Renix.JPG (251.81 KiB) Viewed 817 times
cam and crank VR- not connected to scope.JPG
cam and crank VR- not connected to scope.JPG (204.71 KiB) Viewed 817 times

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