A fully multiplexed J1939 instrument panel cluster on a truck with a body control module has the following inoperative gauges: engine oil pressure, coolant temperature, tachometer, and speedometer. The automatic transmission oil temperature gauge, air pressure gauges, fuel level gauge, and turn signal indicators still function correctly. What could be a possible cause of the inoperative gauges?
A) Short circuit between CAN + and CAN -
B) CAN + is shorted to ground.
C) Missing terminating resistors
D) An open CAN + or CAN - circuit between the engine ECM and the instrument panel cluster

Question

Quizplus · Accepted Answer

An open CAN + or CAN - circuit between the engine ECM and the instrument panel cluster could cause the inoperative gauges, as it would disrupt communication for those specific signals.

A Fully Multiplexed J1939 Instrument Panel Cluster on a Truck