TOHATSU BFT250A Service Manual page 94

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TROUBLESHOOTING
BEFORE TROUBLESHOOTING
TROUBLESHOOTING
• Use a known-good battery for troubleshooting.
• Disconnect the boat equipment (electrical loads)
• Check that the connectors are connected securely.
• Check for sufficient fresh fuel in the fuel tank.
• Check that the emergency stop switch clip is set securely.
• Read the circuit tester's operation instructions carefully, and observe the instructions during inspection.
• When a commercially available circuit tester is used for inspection, use the special tool [Tester probe (Male)
07ZAJ-RDJA110], and take care not to apply excessive force to the connector terminal.
• Switch the tester lead polarities to check the circuit, including the diode (see below). The circuit is normal if
there is continuity in one direction but not the other. If there is continuity in both directions or in neither
direction, the circuit is abnormal.
– Indicator light
– Fuse/relay junction box
– Regulator/rectifier
– Power tilt relay
ENGINE TROUBLESHOOTING
ENGINE DOES NOT START OR ENGINE STALLS
ENGINE DOES NOT START
1. Electrical power system inspection
Turn the combination switch ON.
Check the MIL and warning buzzer.
Does the MIL come ON for 2 seconds and warning buzzer sound twice?
YES
NO
2. Alert system inspection
Check the warning buzzer sound.
Does the warning buzzer sound twice and then keep sounding?
YES
NO
3. Starting system inspection
Check that the starter motor operates properly.
Does the starter motor turn?
YES
NO
4. Engine idle speed inspection
Adjust by turning the idle adjusting screw in or out.
Start the engine.
Engine starts?
YES
NO
5. Spark Test
Perform the spark test (page 8-4).
Is there weak or no spark?
YES
NO
4-2
– GO TO STEP 2.
– Perform fuse/electrical power system troubleshooting (page 4-15).
– Perform alert/warning system troubleshooting (page 4-18).
– GO TO STEP 3.
– GO TO STEP 4.
– Perform starting system troubleshooting (page 9-3).
– Improper idle adjusting screw. Adjust the idle speed (page 3-23).
– GO TO STEP 5.
– Perform ignition system troubleshooting (page 8-3).
– GO TO STEP 6.