Section 78
00-02-0618
04-10-07 -
6 -
Operation and Maintenance
Gage Driver Outputs
Gage outputs operate when CANdrive module reads valid J1939 data for engine speed, oil
pressure and coolant temperature. If CANdrive module stops receiving valid data, the gage
outputs are maintained at the last known value for approximately five seconds, after which time
the outputs are turned off.
Indicating LEDs
All standard models have a green CAN status LED. A flashing CAN status LED indicates that
CANdrive module is powered, but is not receiving any J1939 data. A constantly lit CAN status
LED indicates a good CANbus connection and J1939 activity. (Note: J1939 activity can
originate from ANY device on the CANbus network, and may not be valid data from the engine
ECU.)
Model CDV300R has additional LEDs for indication of engine faults, as transmitted from the
ECU. CANdrive modules respond to single DM1 (active fault code) messages that contain a
Suspect Parameter Number (SPN), Fault Mode Indicator (FMI) and warning/stop lamp data.
CANdrive modules also read multi-packet transport messages broadcast using the broadcast
address message (BAM) protocol.
LEDs typically light continuously to indicate a shutdown fault, and flash to indicate a (non-
shutdown) warning fault.
CANdrive modules can handle up to 8 simultaneous faults at one time; additional fault
messages are not registered. When a fault becomes inactive and is no longer broadcast, the
appropriate LED goes out after approximately two seconds.
