2008 prec "Main welded" slow speed

GEVJOE

so we have a 2008 prec that goes into limp mode after setting "Main welded" code? we replace solenoid and still same issue any and all advice would be greatly appreciated thanks in advance. Joe

BGW

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Stevegrmich

. . check other thread . . I posted a response there . .

GEVJOE

yes still has same porblem we have changed solenoid, cleared codes seems to come back more upon slow throttle engaugement. does not set in history is a "current" code that will clear upon key off/on . thanks again Joe

GEVJOE

ok here basically what has been done. we converted the car to 8V batts and installed lighting kit and this prob occured. Since we have changed EVERYTHING out and still same prob. OBC, multiple solenoids, controller, speed sensor and magnet and motor. Itw ill only set "Main Welded' if you depress pedal slowly or even at a normal rate, if you depress pedal rapidly it will not set code and runs fine. Any help would be greatly appreciated. Thanks in advance Joe

CCFanatic

Have you tried swapping MCORs?

scooterman

Main welded" WHAT IS THIS CODE FOR?

Sergio

Did You check if the diode in line with the Tow/Run switch has failed in the closed position?

The "Main Welded" is the way the controller handles the scenario when it detects that it has dropped the solenoid coil voltage but there is still current flowing thru the power circuit. The program assumes this can only happen if the main contacts in the solenoid are "welded" together.

The problem is that it is a false condition usually triggered by the Regen feature raising the voltage on the motor side higher than the battery side of the controller.

scooterman

So If you disconnect one of the big cables from solenoid, do you still get the same code? If so your saying the regen loop is messed up most likely. Being the controller, motor, solenoid was replaced that doesn't leave much to go wrong lol. I suspect lots of wholesale changes was made here, which makes web troubleshooting difficult when the tiniest detail is left off.

scooterman

This is a good point, also that diode in the wiring. Revert that lighting kit, also if you installed a converter disconnect all of the stuff not factory, this will make troubleshooting much easier.

GEVJOE

ok so yes we swapped MCOR.(sorry forgot to list that) I will check the diode and disco the light kit. no inverter was installed. Thanks again guys