Yamaha F75F - Troubleshooting the PTT Unit

Outboard motor troubleshooting
4-13
Troubleshooting the PTT unit
Symptom 1: PTT unit does not operate.
Symptom 2 Cause Checking steps
See
p
age
PTT relay does not
oper
ate
Blown fuse Check the fuse. 5-5
PTT switch malfunction Check the PTT switch. 5-41
PTT relay malfunction Check the PTT relay. 5-40
Short, open, or loose con-
nection of the wire harness
Measure the PTT switch input volt-
age.
5-41
Measure the PTT relay input volt-
age.
5-40
Check for continuity between the
PT
T switch and the PTT relay.
A-9
A-11
A-12
PTT motor does not
oper
ate
PTT motor malfunction Check the PTT motor. 9-31
Bent trim and tilt ram Check the trim and tilt ram. 9-39
Stuck trim and tilt ram
Disassemble and check the PTT
unit.
9-39
Short, open, or loose con-
nection in PTT motor circuit
Check for continuity between the
PT
T motor and the PTT relay termi-
nal.
A-9
A-11
PTT fluid pressure
does not incre
ase
Manual valve open Check the manual valve. 9-25
Insufficient PTT fluid Add sufficient PTT fluid. 10-21
PTT fluid leakage Check for PTT fluid leakage. 10-5
Clogged fluid passage
Disassemble and check the PTT
unit.
9-35
9-39
Check the filter for dirt and obstruc-
tions.
9-37
Check the valves for damage. 9-37
Check the fluid passages for
obstr
uctions.
9-35
9-39
PTT motor malfunction Check the PTT motor. 9-31
Gear pump malfunction Check the gear pump operation. 9-25