when put in gear, trans engages then kicks out when accelerated. ran diagnostic, voltage on brake position switch 1.27 volt -.78 volt. checked input volts to switch 5.0volts, good. Check sensor output volts to VSM, 4.25 volt. check sensor wire voltage at VSM input plug, 4.25 volts, but dash readout says 1.27. Bad VSM? tried different switch, no change to readings. Could something else effect this I'm missing.
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The voltage does decrease when the pedal is pushed. Brake pressure goes from about 8psi to 500psi when applied. calibrating the transmission made no difference. I didn't check the % screen. The VSM is an old style and the new one will have to be programmed by the dealer, so I'll get with the dealer for the install. Thanks so much for the help.
There is not anything else in that circuit unless you have a wiring problem. Are you in the inch position screen on the display? You should see the voltage decrease as you step down on the pedal. Have you checked the brake pressure switch output? Have you tried to calibrate the transmission? There is also a inch percentage screen, it should be at 0% with pedal released.
I rechecked the pedal released voltage, 4.05 volts. according to the manual this is within range of released voltage reading. The VSM is showing 1.37 in the display. I'm trying to figure out if there are any other inputs that could effect the display reading, or if the VSM is defective
Did you get the 4.25 with the connector plugged into the VSM or was it unplugged? Check the voltage on the VSM sensor terminal with the connector unplugged. If it is 4.25 the VSM is defective.
If you have 4.25 output from the pressure sensor the sensor is defective. I do not understand why the display says a lower voltage.
Are you seeing any codes on the display?
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