IGNITION
90-857046R1 NOVEMBER 2001 Page 2A-17
Troubleshooting with the Digital Diagnostical Terminal
The ECM is designed such that if a sensor fails the ECM will compensate so that the engine
does not go into an over-rich condition. Because of this, disconnecting a sensor for trouble-
shooting purposes may have no noticeable effect.
Using the Digital Diagnostical Terminal (DDT)
IMPORTANT: Any sensor that is disconnected while the engine is running will be re-
corded as a fault in the ECM Fault History. Use the DDT to view and clear the fault his-
tory when troubleshooting/repair is completed.
a
b
c
d
f
e
a-Digital Diagnostic Terminal (91-823686A2)
b-Software Cartridge (91-822608--6)
c-DDT Reference Manual (90-825159--3)
d-DDT Cable 10ft. (3.05m) Extension (84-825003A1)
e-DDT Test Harness (84-822560A7)
f-DDT Test Harness (84-822560A10)
The Quicksilver Digital Diagnostic Terminal (DDT) has been developed specifically to help
technicians diagnose and repair Mercury Marine 2 and 4 cycle engines.
Attach the diagnostic cable to the ECM diagnostic connector and plug in the software car-
tridge. You will be able to monitor sensors and ECM data values including status switches.
The ECM program can help diagnose intermittent engine problems. It will record the state
of the engine sensors and switches for a period of time and then can be played back to re-
view the recorded information.
Refer to the Digital Diagnostic Terminal Reference Manual for complete diagnostic proce-
dures.
To Next Page
Loading...
Need help?
General
