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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / October 2005Variable reluctor VSS compatible with 5V pulse
Hey guys I was wondering if you could help me with a tranny question. I am swaping a 6 spd tranny from a CL-s into my Accord V6. My main problem is that the accord uses variable reluctor speed sensors that have 2 wires and the CL uses a 3 wire sensor that outputs a 5Vpp square wave signal. If I were to connect the 5Vpp signal to the variable reluctor input would it do any damage? I'm thinking the variable reluctor signal must be high impedance and shouldn't hurt itself but it would suck if I burned out the ECU. Thanks for looking. > Hey guys I was wondering if you could help me with a tranny question. I > am swaping a 6 spd tranny from a CL-s into my Accord V6. My main [quoted text clipped - 4 lines] > reluctor signal must be high impedance and shouldn't hurt itself but > it would suck if I burned out the ECU. Thanks for looking. You are not likely to do any damage at all. AFAIK the VR:s have a voltage that will be much higher than 5V at high speed. At least the Ford VR:s are such. The first thing the ECU does is to shape the signal to become a 5V squarewave signal anyway. The two inputs are likely differential and you may have a problem feeding the 5V signal to just one of the inputs. In my EFI converted Pantera (Ford EEC-IV) I used a VDO hall sensor, which generates a 5V squarewave signal, and feed that signal to one of the inputs. I could not make it work by tying the other signal either to ground or +5V. Tying it to +2.5V via a voltage divider was the simple fix. I have also modified a friends DeTomaso Guara, which uses Ford EEC-V, the same way when the DeTomaso factory couldn't get it work properly ;-) That sound like a great idea! Did you use battery voltage for the divider or something more regulated? I thinking about using the 5Vref from my TPS. Thanks for the great idea. -Rich |
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