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
*1: See the wiring diagram.
6P23H11
Cause 1
PTT
switch
mal-
function
Short, open, or loose
connection
of
the
wiring harness
PTT relay malfunc-
tion
Short, open, or loose
connection
of
the
PTT motor lead
PTT motor malfunc-
tion
Blown fuse
Loose connection of
the battery terminal
Discharged battery
Manual
valve
Manual valve mal-
opened
function
Insufficient PTT flu-
id
PTT fluid leakage
Clogged filter
Clogged fluid pas-
sage
Troubleshooting the power unit
Cause 2
Checking step
Check
—
switch.
Check the wiring har-
—
ness continuity.
Check the PTT relay.
—
Check the PTT mo-
—
tor lead.
Disassemble
—
check the PTT mo-
tor.
—
Check the fuse.
Check the battery
—
terminal
—
Check the battery.
Check the manual
valve.
Add sufficient fluid.
—
Check the PTT unit
—
for leakage.
Disassemble
check the PTT unit.
—
Refer
to
page
the
PTT
7-47
*1
7-47
7-28
and
7-27
8-5
3-15
3-15
7-22
3-12
7-22
and
7-22
9-22
1
2
3
4
5
6
7
8
9