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Troubleshooting the PTT unit
Symptom 1: PTT unit does not operate
Symptom 2
Short, open, or loose
connection of the
PTT relay does
wiring harness
not operate
PTT relay malfunction
Discharge battery
Loose connection of
the battery terminal
Blown fuse (20A)
PTT motor does
not operate
Short, open, or loose
connection of the PTT
motor lead
PTT motor malfunction
Manual valve opened
Insufficient PTT fluid
Oil pressure
does not
PTT fluid leakage
increase
Clogged filter
Clogged fluid passage
*1 See the wiring diagram
61U5H11
Cause 1
Cause 2
Manual valve
malfunction
Troubleshooting the power unit
Checking step
Check the wiring har-
—
ness continuity.
—
Check the PTT relay.
—
Check the battery.
Check the battery ter-
—
minal.
—
Check the fuse (20A).
Check the PTT motor
—
lead.
Disassemble and
—
check the PTT motor.
Check the manual
valve for open.
—
Add sufficient fluid.
Check the PTT unit for
—
leakage.
Disassemble and
—
check the PTT unit.
Refer
1
to
page
*1
2
7-57
3-14
3
—
7-57
4
*1
7-39
5
—
3-10
6
7-35
7-44
7-50
7
8
9
9-6
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