Reflash Procedure
Mercury Marine will occasionally make changes or enhancements to its engine calibrations. The CDS G3 tool has the ability to
reflash PCMs and other vessel control modules when necessary. Always make sure to keep the CDS G3 tool updated, as this
will ensure that you have the latest available calibration files from Mercury.
CDS G3 will identify when an updated calibration is available for the engine it's connected to and will place a priority action item
on the home screen. Select Update or select the Reflash button at the bottom of the screen.
1. The Reflash Package Browser screen will filter the available calibration for the connected engine. CDS G3 will look at the
current calibration and will only allow the correct update to be made. Click the drop‑down arrow, select the calibration
update, and then click next at the bottom of the screen.
IMPORTANT: If other vessel control module updates are available such as JPO, always refer to the service bulletin
referenced on the reflash package browser prior to reflashing those modules. Updating vessel control module calibrations
without performing the service bulletin in its entirety may result in an inoperable vessel.
a - Drop‑down arrow
b - Updated PCM calibration
c - Next button
2. On the Reflash Prerequisites screen, ensure all parameters pass the check and then click Next.
3. Ensure the engine PCM is selected on the Reflash Module View screen, then click next at the bottom of the screen.
a - Engine PCM selection
b - Next button
CDS G3—Module Reflash
Page 3F-2 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018