IMPORTANT: The G3 engine harness adapter (84‑8M0046081) provides the proper resistance for communication on
CAN P and CAN H.
a - Computer
b - G3 SmartCraft diagnostic
interface
c - CAN P/CAN H adapter harness
d - G3 engine harness adapter
e - Connect to the engine CAN
P/CAN H connector
Connection to the Junction Box or Diagnostic Port
1. Insert the G3 SmartCraft diagnostic interface USB connector into a powered USB port.
2. Connect the SmartCraft diagnostic interface 9‑pin connector to the CAN P/CAN H adapter harness 9‑pin connector.
3. Connect the CAN P/CAN H adapter harness to the junction box or diagnostic port.
IMPORTANT: Ensure that the correct termination resistors are installed on the CAN P and CAN H buses. The CAN P and
CAN H buses must be properly terminated for the tool to communicate. Improper termination will result in communication
errors or complete loss of communication.
a - Computer
b - G3 SmartCraft diagnostic interface
c - CAN P/CAN H adapter harness
d - Connect to junction box or diagnostic port
Troubleshooting
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 1D-23
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