Accessing Ecm Information With The Cds - Mercury 25 EFI Service Manual

Troubleshooting and Diagnostics
Attach the 84‑899150T01 diagnostic cable to the ECM diagnostic port and attach the 84‑822560A7 adapter to the
84‑899150T01 diagnostic cable. The CDS will monitor sensors and ECM data values including status switches. The ECM
program can help diagnose intermittent engine problems. It can record the state of the engine sensors and switches for a
period of up to 10 minutes, which then can be played back and analyzed.
a
Adapter Harness
Adapter Harness
When using the CDS for troubleshooting, follow the CDS driven troubleshooting menu for the complete diagnostic
troubleshooting procedures.

Accessing ECM Information with the CDS

The CDS allows the technician to specifically identify the engine to be tested. It is important to accurately identify the engine
because in many cases, the available testing options depend on the engine identified. It is also capable of storing customer
contact information and will identify the required diagnostic cables for the engine selected.
CDS G3 Diagnostic Tool Kit
The Pinpoint Diagnostics (when applicable) allows the technician to identify the cause of a fault code down to the component
level. Pinpoint Diagnostic test results can be stored in the CDS.
Fault codes can be displayed active or historic. The Fault Status displays the code number, description, and the source of the
faults. Fault Hours displays a fault number and text that corresponds to the exact moment in the engines' run history the fault
was set.
When the 84‑899150T01 diagnostic cable is plugged into the ECM diagnostic port, a special service mode is activated within
the ECM. When the special service mode is activated, the ECM will not log run time, nor will it allow any fault hours to be set.
Any previously logged run time and fault hours can be reviewed for diagnostic purposes, but the run time will not increase and
no new fault hours can be set when the ECM is in the service mode. During a water test, the data stream and any faults that
occur during the water test, will be recorded. The water test does not affect the logging of faults, run history, or system
information.
The diagnostic cable connection supplies power to the ECM. Disconnecting sensors and actuators while the ECM is powered
up in the special service mode, will cause faults to be displayed in the faults status screen. These faults will not be recorded in
the memory fault hours. The CDS will not clear (erase) faults hours at the time of this service manual printing.
The System Information screen will display an alpha‑numeric code identifying a specific calibration in the ECM.
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b
© 2016 Mercury Marine
a - Diagnostic port
b - ECM
23249
84‑899150T01
84‑822560A7
8M0114141
90-8M0105568 eng MARCH 2016