Suzuki DF175AP User Manual (English)

Questions and Answers:

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Eric PhamSep 1, 2025
What to do if my Suzuki Outboard Motor Keyless Start System does not turn ON even when the engine switch is operated and the error sound (three short buzzer beeps) is NOT heard?
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  Maria CaldwellSep 1, 2025
  If the Keyless Start System on your Suzuki Outboard Motor doesn't turn ON when the engine switch is operated, and you don't hear the error sound (three short buzzer beeps), check the following: * Ensure the emergency stop switch lock plate is in position. * Inspect the battery terminal connection for corrosion or looseness. * Verify the battery has power. * Keyless control unit failure. * Check for loose electric wiring connections. * Engine switch panel failure.
T
Thomas BrownAug 30, 2025
What does it mean if the caution system is activated on my Suzuki DF175AP Outboard Motor?
- A
  anna07Aug 31, 2025
  If the caution system is activated on your Suzuki Outboard Motor (caution buzzer sounds, caution LEDs light), it could indicate several issues: * The cooling water passage may be clogged. * The thermostat or water pump might have failed. * The oil change reminder system may be activated. * The engine oil level might be low or the oil deteriorated, or the engine oil filter could be clogged. * The oil pump might have failed. * The propeller might be damaged. * Battery power could be lost. * The engine control sensor might be faulty. * Check for loose electrical wiring connections.
B
Bryan MooreAug 29, 2025
What to do if my Suzuki Outboard Motor engine idles unstably or stalls?
- V
  Vickie LeeAug 29, 2025
  If your Suzuki Outboard Motor engine idles unstably or stalls, here are some things to check: * See if the spark plug is fouled. * Check for a kinked or pinched fuel hose, or a fuel hose that's not properly connected to the engine. * Make sure the fuel isn't deteriorated and the fuel filter isn't clogged. * The fuel pump might have failed. * The ignition system may be faulty. * Ensure you're using the correct engine oil. * The thermostat might have failed. * Check for loose electrical wiring connections.
J
Jasmine HartAug 27, 2025
What to do if my Suzuki DF175AP Outboard Motor engine speed will not increase?
- J
  Jason WebbAug 27, 2025
  If the engine speed of your Suzuki Outboard Motor won't increase, consider these potential causes: * Check if the propeller is damaged or not clean. * Ensure the propeller is properly selected. * Verify the outboard motor is correctly installed and the trim angle is properly adjusted. * See if the spark plug is fouled or incorrectly selected. * Check for a kinked or pinched fuel hose, or a clogged fuel filter. * The fuel might be deteriorated, or the fuel pump might have failed. * The ignition system or electronic throttle system might be faulty. * Too much cargo on the boat. * Water in the boat. * Bottom of boat is not clean or damaged.
T
trevor27Aug 27, 2025
Why won't my Suzuki Outboard Motor starter motor operate?
- P
  pblackwellAug 27, 2025
  If the starter motor on your Suzuki Outboard Motor won't operate, check the following: * Ensure the emergency stop switch lock plate is correctly positioned. * Check if the starter relay fuse or sub battery cable fuse is blown. * Confirm the control handle is in NEUTRAL. * Inspect the battery terminal connection for corrosion or looseness. * Verify the battery has power. * The starter motor might have failed. * The engine switch or start/stop switch might have failed. * The ignition switch or start/stop switch might have failed. * Check for loose electric wiring connections.
S
Shelia RuizAug 25, 2025
Why won't the engine speed increase on my Suzuki DF175AP?
- A
  Andrea Jacobs DVMAug 25, 2025
  If the engine speed of your Suzuki Outboard Motor won't increase, consider these possible causes: a damaged or dirty propeller, or an improperly selected propeller. Ensure the outboard motor is correctly installed and the trim angle is properly adjusted. Check for a fouled or incorrectly selected spark plug, a kinked fuel hose, or a clogged fuel filter. Deteriorated fuel, a failed fuel pump, or a failed ignition system could also be to blame. Other potential issues include a failed electronic throttle system, heavy cargo on the boat, water in the boat, or a dirty/damaged boat bottom.
A
Amanda RamirezAug 23, 2025
What to do if my Suzuki DF175AP Outboard Motor engine will not start (hard to start)?
- V
  Vanessa DuffyAug 23, 2025
  If your Suzuki Outboard Motor engine won't start or is hard to start, consider the following: * Check if the fuel tank is empty. * Ensure the fuel isn't deteriorated. * Verify you're using the correct engine starting procedure. * Make sure the fuel tank air vent is open. * Confirm the fuel hose is properly connected and not kinked or pinched. * Inspect the fuel filter and tank filter for clogs. * Check the fuel pump. * See if the spark plug is fouled or the ignition system is faulty. * Check for loose electrical wiring.

Suzuki DF175AP Specifications

General

Starting System	Electric
No. of Cylinders	4
Steering	Remote
Trim Method	Power Trim and Tilt
Max Power	175 HP
Fuel Delivery System	Multi Point Sequential Electronic Fuel Injection
Bore x Stroke	97 mm x 97 mm
Shaft Length	L: 508 mm (20 in.), X: 635 mm (25 in.)
Exhaust	Through Propeller
Ignition System	Fully Transistorized
Engine Type	4-stroke, DOHC
Displacement	2, 867 cc

Summary

Safety and Warning Information

Signal Word Definitions

Defines WARNING, CAUTION, NOTICE, and NOTE symbols and their meanings for hazard identification.

Break-In Information

Highlights the importance of the first 10 operating hours for engine life and performance.

Important Owner Notices

Provides general safety advice, familiarization with features, and inspection requirements.

Fuel and Oil Management

Gasoline Recommendations

Details octane requirements, ethanol blends, and oxygenated fuels for optimal engine performance.

Engine and Gear Oil

Engine Oil Specifications

Specifies viscosity grades (SAE 10W-40/10W-30) and types of engine oil for performance and life.

Gear Oil Specifications

Outboard Motor Installation

Emission-Related Installation Instructions

General Installation Recommendations

Recommends dealer installation and warns about the hazards of overpowering the boat.

Battery System Installation

Battery Requirements

Specifies minimum battery ratings (MCA, CCA, RC) for starting the engine and auxiliary loads.

Battery Installation Procedures

Securing and Connecting the Battery

Details wiring, terminal caps, safety precautions, and proper connection/disconnection methods.

Battery Safety Warnings

Covers hazards of battery acid (poisonous, corrosive) and hydrogen gas (explosive).

Key-Fob Emergency and Communication

Key-Fob Battery Replacement Warnings

Passcode Setting and Changing

Passcode Setting Procedure

Propeller Handling and Installation

Propeller Type Selection Warning

Warns about potential accidents if propeller rotation is mismatched with the lower unit rotation.

Propeller Installation and Adjustments

Propeller Installation Steps

Provides a step-by-step guide for installing a propeller, including greasing and tightening.

Trim Angle Adjustment

Trim Angle and Trim Tab Adjustments

Trim Angle Effects and Warnings

Caution and Alarm System Overview

Alarm Notifications and Indicators

Describes how alarms alert the operator via caution messages, icons, and buzzer sounds.

Caution System Purpose and Warnings

Explains systems designed to alert to situations causing motor damage and general notices.

System Caution and Indicator Checks

Specific Caution Systems

Covers Over-Rev, Oil Pressure, Cooling Water, and Battery Voltage cautions and their indicators.

Indicator Checks and System Operation

Details checks for system indicators, buzzers, and proper system functionality.

Caution Systems for Engine Operation

Oil Pressure and Over-Revolution Cautions

Explains low oil pressure warnings and over-revving cautions, including automatic speed reduction.

Engine Oil Level and Maintenance

Stresses the importance of checking engine oil level periodically to prevent severe damage.

Cooling Water and Engine Operation Cautions

Cooling Water Caution System

Explains overheat warnings, checks for pilot hole water discharge, and potential causes.

Cooling Water System Warnings

Advises on severe damage from overheating, improper operation, and blocked water intakes.

Battery Voltage Caution System

Low Battery Voltage Alerts

Covers low battery voltage warnings, system behavior, and precautions during operation.

Battery Handling and Safety Warnings

Stresses precautions when inspecting or servicing the battery to avoid hazards.

Electronic Control System Cautions

Control Unit Communication Caution

Alerts for errors in the electronic throttle and shift control systems, indicated by screen messages.

2nd Station Control Caution

Alerts for errors in the second control station, disabling control from that station.

Throttle and Shift Control Cautions

Throttle System Caution

Alerts for electronic throttle system errors, restricting engine RPM to 2000.

Shift Control Caution System

Alerts for electronic shift system errors, limiting engine control and shift operations.

Gauge and Station Setting Cautions

Gauge Communication Caution

Station Setting Troll Mode Caution

Troll Mode and Keyless System Cautions

Troll Condition and System Cautions

Keyless Start System Cautions

Diagnostic and Reminder Systems

Diagnostic System Overview

Explains how the system warns of abnormal sensor signals to the control unit.

Diagnostic System Warnings

Advises consulting a dealer for repair if the diagnostic system activates due to sensor signal issues.

Oil Change Reminder and Cancellation

Oil Change Reminder System

Operational Alerts and Systems

Engine Stalling Caution

Alerts the operator when the motor stalls unexpectedly during operation.

Water in Fuel Alert System

Warns if water separated from fuel exceeds a specific volume, with alerts during neutral operation.

Tilting System Operation

PTT Switch Safety Warnings

Pre-Boating Inspection

Essential Pre-Boating Checks

Lists essential checks for fuel level, engine oil level, and onboard safety equipment.

Break-In Procedure and Warnings

Break-In Period and Guidelines

Details the 10-hour break-in period, including warm-up, idling, and controlled throttle operation.

Break-In Procedure Warnings

Warns about potential engine damage (e.g., piston seizure) from improper break-in or high-speed operation.

Engine Operation Procedures

Keyless Start System Operation

Pre-Start Engine Procedures

Before Attempting to Start

Covers lowering the motor, securing fuel lines, ensuring neutral gear, and fastening the safety cord.

Starting the Engine

Emergency Stop Switch Precautions

Warns about properly attaching and using the emergency stop cord to prevent injury or death.

Engine Start Procedure

Details priming the fuel bulb and initiating the engine start sequence using the main switch or start button.

Engine Start and Operation

Engine Start Sequence

Explains pushing the start/stop switch and the starter motor's continuous operation until engine starts.

Engine Start Warnings

Warns about holding the start switch, potential starter system damage, and low oil pressure.

Engine Warm-up and Cooling Water Check

Engine Warm-up Procedure

Advises warming up the engine for about 5 minutes before operating at high speeds.

Cooling Water Check

Explains checking the pilot water hole for proper water spray, indicating cooling system function.

Emergency Stop Switch Check

Recommends checking the emergency stop switch operation before starting off.

Emergency Start Procedure

Emergency Key Usage

Details using the emergency key to release the locked state if the key-fob is lost or battery is low.

Emergency Key Passcode Entry

Starting and Stopping the Engine

To Start the Engine

Covers installing the lock plate and pushing the START & STOP switch to start the engine.

To Stop the Engine

Details shifting to neutral, engine cool-down, stopping the engine, and turning off the keyless system.

Shifting and Speed Control

Shifting Procedure

Explains how to shift the control handle into Forward, Neutral, and Reverse positions.

Speed Control Operation

Engine Stopping and Safety

Speed Control Description

Stopping the Engine

Details procedures for stopping the motor, including keyless system off state.

Engine Stopping and Safety

Keyless Start System OFF State

Advises turning the keyless system OFF when the engine is not running to prevent battery discharge.

Engine Stopping Warnings

Warns about unauthorized use, fuel leaks if fuel line remains connected, and battery discharge.

Mooring and Safety

Mooring Safety Warnings

Motor Transport and Fluid Draining

Horizontal Transport Warnings

Inspection, Maintenance, and Service Schedule

Maintenance Schedule Chart

Provides a chart detailing service intervals (hours/months) for various motor components.

Maintenance Recommendations and Tools

Maintenance Warnings and Proper Practices

Stresses proper maintenance, using genuine parts, and consulting dealers for complex tasks.

Spark Plug Service

Spark Plug Removal and Installation

Spark Plug Warnings and Equivalents

Spark Plug Maintenance and Adjustment

Spark Plug Tightening and Gap

Breather and Fuel Line Inspection

Breather and Fuel Line Checks

Fuel Leakage Warnings

Warns about explosion or fire hazards from fuel leaks and advises prompt replacement of faulty lines.

Engine Oil Change Procedure

Engine Oil Change Steps

Provides step-by-step instructions for changing engine oil, including draining and refilling.

Engine Oil Warnings and Notices

Covers safety during oil changes and impact of extended trolling on oil life.

Engine and Gear Oil Maintenance

Engine Oil Level Check

Explains how to check the engine oil level using the dipstick after the engine has cooled.

Gear Oil Check and Change

Explains how to check gear oil level and the procedure for changing gear oil.

Used Oil Handling Warnings

Covers safety precautions when handling used oil, including skin contact and disposal.

Gear Oil and Fuel Filter Service

Gear Oil Injection and Venting

Gear Oil Contamination Warning

Low Pressure Fuel Filter Replacement

Fuel Filter Servicing Warnings

Warns about gasoline hazards during fuel filter servicing and the toxicity of cleaning solvents.

Fuel Filter Inspection and Cleaning

Fuel Filter Inspection Steps

Fuel Filter Draining and Lubrication

Fuel Filter Draining and Component Inspection

Corrosion Prevention and Anodes

Anodes Function and Inspection

Anode Maintenance and Warnings

Bonding Wires and Battery Maintenance

Battery Maintenance and Warnings

Covers checking battery condition, fluid levels, and safety precautions during handling and charging.

Engine Filters, Chains, and Flushing

Battery Acid Warnings

Warns about battery acid hazards, including damage to the battery if diluted sulfuric acid is added.

Flushing Water Passages

Flushing Warnings

Flushing Water Passages Procedure

Flushing Procedure Steps

Flushing Warnings and Notices

Warns about severe engine damage from starting without water supply and checking pilot water hole spray.

Submerged Motor Procedure

Submerged Motor Steps

Submerged Motor Warnings

Warns about damage from continued cranking with resistance and from contaminated fuel supply.

Storage Procedure

Motor Storage Steps

Storage Warnings

Warns about moving parts when the engine is running and severe damage from starting without water.

Battery Storage and Post-Storage

After Storage Procedures

Troubleshooting and Emission Information

Starter Motor Not Operating

Lists common reasons for starter motor failure, such as switch issues, battery problems, or wiring.

Engine Hard to Start

Lists common reasons for difficult engine starts, including fuel issues, incorrect procedures, or clogged filters.

Troubleshooting Engine Performance

Engine Idling and Stalling Issues

Covers problems with unstable idling or stalling, citing causes like fouled spark plugs or failed thermostats.

Caution System Activation Causes

Explains causes for caution buzzers and LEDs, such as clogged water passages or low oil level.

Shift and Propeller Operation Issues

Engine Speed and Vibration Issues

Keyless Start System Faults

Fuse Replacement Warnings and Identification

Fuse Replacement Warnings

Warns against using incorrect amperage fuses or substitutes, which can cause electrical damage or fire.

Fuse Identification Chart

Related product manuals

Suzuki DF175 Four Stroke

Suzuki DF175AP User Manual

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