Troubleshooting The Ptt Unit - Yamaha 55DEHD Service Manual

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Troubleshooting the PTT unit

Symptom 1: PTT unit does not operate
Symptom 2
PTT relay does
not operate
PTT motor does
not operate
Oil pressure
does not
increase
WD: See the wiring diagram
9-7
Troubleshooting
Cause 1
Short, open, or loose
connection of the
wiring harness
PTT relay malfunction
Loose connection of
the battery terminal
Discharged battery
Blown fuse (20A)
Short, open, or loose
connection of the PTT
motor lead
PTT motor malfunction
Manual valve opened
Insufficient PTT fluid
PTT fluid leakage
Clogged filter
Clogged fluid passage
Cause 2
Check the wiring har-
—
ness for continuity.
— Check the PTT relay.
Check the battery ter-
—
minal.
— Check the battery.
— Check the fuse (20A).
Check the PTT motor
—
lead and ground circuit.
Disassemble and
—
check the PTT motor.
Manual valve Check the manual
malfunction valve for open.
— Add sufficient fluid.
Check the PTT unit for
—
leakage.
Disassemble and
—
check the PTT unit.
Checking step
Refer
to
page
WD
7-64
—
3-19
7-64
WD
7-42
—
3-15
7-40
7-37
7-35
7-50
6885J11