Electrical system: Ignition: Module03/06/199292V029000
STRAY VOLTAGE INDUCED ON THE POWER TAKEOFF (PTO) SIGNAL CIRCUIT 510 MAY OCCUR WHEN THE ELECTRONIC CONTROL MODULE (ECM) CONNECTOR GETS WET, CAUSING UNINTENDED ENGINE ACCELERATION.
Consequence
UNINTENDED ENGINE ACCELERATION WHILE THE BUS IS IN GEARMAY RESULT IN A LOSS OF VEHICLE CONTROL AND AN ACCIDENT.
Remedy
INSTALL A GROUND INTERLOCK TO GROUND CIRCUIT 510 IN THE DDEC SYSTEM ANYTIME THE PTO IS DISABLED FOR ANY REASON. THE GROUND ELIMINATES THE STRAY VOLTAGE EFFECT BETWEEN THE ECM CONNECTOR AND CIRCUIT 510.
SYSTEM: ELECTRICAL SYSTEM.VEHICLE DESCRIPTION: TRANSIT BUSES AND INTER-CITY COACHES EQUIPPED WITH DETROITDIESEL EC-1 AND EC-II CONTROLLED 6V-92TA, 8V-92TA, AND SERIES 60 ENGINES.
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