178
EN 3340.758.003a - 2014-11
TROUBLESHOOTING
MM9000 Rev C.8 01/13
Page 178
MM9000 ClearCommand User Manual
Troubleshooting
10.11.2.4 Electronic Throttle - Equal Throttle Synch Problem Causes and Solutions
A
SYMPTOM:
The green LED is lit solid, though the Engine RPM’s differ by a significant
amount.
B
SYMPTOM:
One or both of the engines continually changes RPM (hunts). Will not
synchronize properly
C
SYMPTOM:
Synchronization does not function. The Control Head’s green LED does not
light.
Cause
Remedy
a.
Function Code E7 is set to 00 and the
Throttle Minimum and Throttle Maximum
Values differ between the Port and
Starboard Processors.
a.
Scroll to Function Codes
E2
and
E3
on both Processors and
compare the Values.
The Values of
E2
and
E3
must be the same for both Processors.
Adjust as necessary.
b.
The engines run at different RPM’s with
the same throttle command signals.
b.
Active Synchronization MUST be Enabled.
Cause
Remedy
a.
A Station-in-Command Control Head’s
Command Signal is varying.
a.
Scroll to the Diagnostic Menu Function Code
H0
. Go to the
appropriate Station A/D Count’s display. The Value should not
change by more than +/- 1 A/D Count.
If so, check the connections and if good, replace the Control
Head.
b.
One or both of the Tach Signals isn’t
being read intermittently. Function Code
E7
is set to a Value of
01 or
03
.
b.
Scroll to Function Code
H0
on both Processors and display the
frequency of the Tach Signal. If variations of the signal are
measured, the cause must be determined
Cause
Remedy
a.
The Processors think Astern is being
commended when the Control Head lever
is positioned to the Ahead Detent.
a.
Place both the Port and Starboard Processor into Warm-up Mode
by pressing the Transfer Button while moving the Control Head
levers to the Ahead detent. Both Control Head’s red LEDs should
be blinking. If not, the 7-conductor’s connections at pins 5 and 7
are reversed.
b.
The Serial Communication Harness is not
properly installed.
b.
Ensure the Serial Harness’ plugs are fully inserted into the Port
and Starboard Processor’s Pigtails.
c.
The Processors are not programmed for
twin screw.
c.
Scroll to Function Code
A1
on both Processors and verify that the
Value of both is set to
02
.
d.
Both Processors are set to the same ID
number.
d.
Scroll to Function Code
A0
and verify that the Port and Starboard
Processors have different ID numbers.
e.
Function Code
E7
Value is set to
02
.
e.
Depending on the installation, change the Value of
E7
to
00
,
01
,
or
03
.
f.
Function Code
E7
is set to
03
and no
Tach Signal is present.
f.
Determine why there is no Tach Signal present.
Summary of Contents for MM9000
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