Troubleshooting The Ptt Unit - Yamaha F150A Service Manual

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
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 in PTT motor circuit
Bent tilt ram or trim ram
Stuck tilt ram or trim ram
Manual valve open
—
Insufficient PTT fluid
PTT fluid leakage
Clogged fluid passage
PTT motor malfunction
Gear pump malfunction
Outboard motor troubleshooting
Checking steps
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 wiring harness continuity
between the PTT switch and the PTT
relay.
Check for wiring harness continuity
between the PTT switch and the fuse.
Check the PTT motor.
Check for continuity between the PTT
motor and the PTT relay terminal.
Check the tilt ram and trim ram.
Disassemble and check the PTT unit.
Check the manual valve.
Check the hydraulic pressure.
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 passage for obstructions.
Check the PTT motor.
Check the gear pump operation.
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5-3
5-42
5-41
5-42
5-41
A-6
A-8
A-6
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9-35
A-6
A-8
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9-54
9-48
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9-48
9-54