Code 40.....Troubleshot all control wiring to M contact,contact driver replaced with known good one,replaced travel manager and firmware code still coming up.I need some other direction to travel all out of ideas?????
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After I installed new VM code C9 appeared I couldn't get into putting password in,I thought I had installed firmware wrong.Code 40 came up and I'm back to square one.Its possible I read my short chks.wrong will find out Monday...Thnx for help.
found a service bulletin on this code 40
Issue:
The truck has Error Code 40, M contactor detected closed when commanded to be open. Test AA should be greater than 18 volts for a 36 volt truck, but we get 0.00 volts. Also ran test O3 which says the M contactor is OK.
Cause:
Short to B- (battery negative) or frame by cables or components (Q1, Rec1, Rec2, Motor etc.). The M contactor or the Vehicle Manager may have failed.
Resolution:
There is short to B- or frame. Check for a short to frame. The motor may be the problem. Check all components to B- (Q1, Rec1 and Rec2). If there are no shorts, then the VM (Vehicle Manager) has failed. When you measure 0 volts at M sense line (test AA) that means you have a short somewhere. The sense line is pulled up internal to the VM by a resistor to B+ (battery positive) and must measure 18 volts or more. So again, either there is a short somewhere in the armature circuit or the pull up circuit in the VM has failed.
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