Mercury V6 175 Diagnostic Manual page 85

Name
Ignition Spark
Smart Start
Tach Output
Injector Pulse
Trim Relay
Starter Output
Electronic Throttle
Control Output
Advanced Sound
Control
90-8M0146617 eng JULY 2018
Description
Activates the chosen ignition coil to allow for
testing with a spark gap tester.
Activates a start sequence, engine will crank and
start if able.
Sends a 3000 RPM signal on the gray analog
tachometer lead to test operation of a
tachometer.
Activates the chosen fuel injector to diagnose
functionality.
Activates the trim up or down relays to diagnose
their functionality.
Activates the start relay to crank the engine,
without applying fuel or spark.
Allows the ETC to be manually activated to
observe its operation with the engine off.
Activates the Advanced Sound Control valve
open or closed.
Since these engine utilize waste‑spark, both leads
on the shared coil must be grounded and will fire
simultaneously.
Disconnect the fuel pump and relieve fuel
pressure to prevent flooding cylinders during the
test.
With the engine running, a change in the exhaust
noise should be very apparent.
© 2018 Mercury Marine
CDS G3—Diagnostics Screen
Additional Comments
Page 3E-3