Subaru 602 - Ground Short of CAN Low Wire

20
June 2013
Electrical Systems Operation & Diagnosis Module (602)
Ground Short of CAN low Wire
When a short to ground occurs on the CAN low wire, the voltage and data on the CAN low wire is
not received by the CAN. The voltage of the CAN high wire drops because of the parallel wiring
with the terminators. The voltage levels of the CAN high wire will increase enough to allow data
to be sent and received throughout the CAN. The noise insulating properties of the CAN will be
lost but most vehicle systems will continue to function.
Main bus
ELECTRIC
POWER
STEERING CM
COMBINATION
METER
BODY
INTEGRATED
UNIT
STEERING
ANGLE
SENSOR
VDC CM
120Ω120Ω
TCM
DATA LINK
CONNECTOR
A/C CM
ELECTRONIC
PARKING
BRAKE CM
ECM
CAN Low
CAN Low Wire
RT = ____________________
1 state 0 state
Voltage CAN High _____________ _______________
Voltage CAN Low _____________ _______________
20