Yamaha F150A - Troubleshooting the PTT Unit

4-16
Outboard motor troubleshooting
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 Cause Checking steps
See
page
PTT relay does not oper-
ate
Blown fuse Check the fuse. 5-3
PTT switch malfunction Check the PTT switch. 5-42
PTT relay malfunction Check the PTT relay. 5-41
Short, open, or loose connec-
tion of the wiring harness
Measure the PTT switch input voltage. 5-42
Measure the PTT relay input voltage. 5-41
Check for wiring harness continuity
between the PTT switch and the PTT
relay.
A-6
A-8
Check for wiring harness continuity
between the PTT switch and the fuse.
A-6
A-8
PTT motor does not
operate
PTT motor malfunction Check the PTT motor. 9-35
Short, open, or loose connec-
tion in PTT motor circuit
Check for continuity between the PTT
motor and the PTT relay terminal.
A-6
A-8
—
Bent tilt ram or trim ram Check the tilt ram and trim ram. 9-41
Stuck tilt ram or trim ram Disassemble and check the PTT unit. 9-41
PTT fluid pressure does
not increase
Manual valve open Check the manual valve. 9-60
— Check the hydraulic pressure. 9-35
Insufficient PTT fluid Add sufficient PTT fluid. 10-14
PTT fluid leakage Check the PTT fluid leakage. 10-14
Clogged fluid passage
Disassemble and check the PTT unit.
9-41
9-48
9-54
Check the filter for dirt and obstructions.
9-48
9-54
Check the valves for damage.
9-41
9-54
Check the fluid passage for obstructions. 2-19
PTT motor malfunction Check the PTT motor. 9-48
Gear pump malfunction Check the gear pump operation. 9-54