Troubleshooting The Ptt Unit - Yamaha F225F Service Manual

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Troubleshooting the PTT unit

Troubleshooting consists of the following 3 items:
Symptom 1: Specific trouble conditions
Symptom 2: Trouble conditions of an area or individual part
Cause: Trouble causes of symptom 2
— : Not applicable
Symptom 1: PTT unit does not operate.
Symptom 2
PTT relay does not oper-
ate
PTT motor does not
operate
PTT fluid pressure does
not increase
Symptom 1: PTT unit does not hold the outboard motor up.
Symptom 2
Decrease in PTT fluid
pressure in lower cham-
ber of PTT cylinders
4-35
Troubleshooting
Cause
Blown fuse
PTT switch malfunction
PTT relay malfunction
Short, open, or loose connec-
tion of the wiring harness
PTT motor malfunction
Short, open, or loose connec-
tion of the PTT motor lead
—
Manual valve opened
Insufficient PTT fluid
PTT fluid leakage
Clogged fluid passage
Gear pump malfunction
Cause 1
Manual valve open
Insufficient PTT fluid
PTT fluid leakage
Clogged or open fluid passage Disassemble and check the PTT unit.
Checking step
Check the fuse.
Check the PTT switch.
Check the PTT relay.
Measure the PTT switch input voltage.
Measure the PTT relay input voltage.
Check for continuity between the PTT
switch and the fuse holder.
Check for wiring continuity between the
PTT switch and engine ECM.
Check for wiring continuity between the
PTT relay and engine ECM.
Check the PTT motor.
Check for wiring continuity between the
PTT motor and the PTT relay terminal.
Measure the PTT fluid pressure
Check the manual valve.
Add sufficient PTT fluid.
Check the PTT fluid leakage.
Disassemble and check the PTT unit.
Check the filter for dirt and obstructions.
Check the valves for damage.
Check the fluid passages for obstruc-
tions.
Check the gear pump assembly.
Checking step
Check the manual valve.
Add sufficient PTT fluid.
Check the PTT fluid leakage.
Check the valves for damage.
Check the fluid passages for obstruc-
tions.
See
page
5-3
A-11
5-68
5-66
5-68
5-66
5-68
A-11
5-68
A-11
5-68
A-11
9-41
A-11
9-33
9-35
10-13
10-14
9-45
9-51
9-45
9-48
9-45
9-51
9-48
See
page
9-35
10-13
10-14
9-45
9-51
9-48
9-45
9-51