TOHATSU BFT115A Service Manual page 100

TROUBLESHOOTING
8. Fuel injector inspection
Inspect the fuel injector (page 5-134).
Is the fuel injector normal?
YES
NO
9. IAC valve inspection
Replace the IAC valve with a new one and start the engine.
Is the engine idle/trolling speed normal?
YES
NO
ENGINE SPEED DOES NOT INCREASE
1. Throttle link/ control cable inspection
Inspect the throttle link/control cables (page 3-9).
Is the adjustment correct?
YES
NO
2. Propeller inspection
Match the propeller.
Is the propeller correct?
YES
NO
3. Fuel Flow Inspection
Inspect the fuel flow (page 5-130).
Is the fuel flow within specification?
YES
NO
4. Pressure regulator inspection
Check the fuel pressure and record it (page 5-129).
Disconnect the pressure regulator control tube.
Check the fuel pressure.
Is the fuel pressure higher with the control tube disconnected?
YES
NO
5. Valve clearance inspection
Inspect the valve clearance (page 3-15).
Is the valve clearance correct?
YES
NO
4-10
– GO TO STEP 9.
– • Repair the open or short circuit fuel injector wire
• Faulty fuel injector
– Faulty original IAC valve
– Replace the ECM with a new one and recheck.
– GO TO STEP 2.
– Improper throttle cable adjustment (page 3-9).
– GO TO STEP 3.
– Propeller mismatched
– GO TO STEP 4.
– • Clogged, bent or damaged fuel tube
• Clogged fuel strainer (Low pressure side) (page 3-24)
• Clogged water separator (page 3-24)
• Faulty fuel pump (Low pressure side)
• Clogged vapor separator air vent tube or filter
• Faulty vapor separator (page 5-133)
• Clogged, bent or damaged fuel feed hose
• Clogged fuel strainer (High pressure side) (page 3-26)
• Faulty fuel pump (high pressure side)
– GO TO STEP 5.
– Faulty pressure regulator
– GO TO STEP 6.
– Improper valve clearance adjustment (page 3-15).