TOHATSU BFT115A Service Manual page 101

6. Fuel injector inspection
Inspect the fuel injector (page 5-134).
Is the fuel injector normal?
YES – Replace the ECM with a new one and recheck.
NO – • Repair the open or short circuit fuel injector wire
• Faulty fuel injector
ENGINE SPEED DOES NOT STABILIZE WHEN RUNNING AT HIGH SPEED AND ENGINE SPEED IS NOT
AS HIGH AS IT USED TO BE WHEN RUNNING WITH THE THROTTLE FULLY OPEN
1. Throttle link/ control cable inspection
Inspect the throttle link/control cables (page 3-9).
Is the adjustment correct?
YES – GO TO STEP 2.
NO – Improper throttle cable adjustment (page 3-9).
2. Fuel Flow Inspection
Inspect the fuel flow (page 5-130).
Is the fuel flow within specification?
YES – GO TO STEP 3.
NO – • 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)
3. Fuel inspection
Check to see if the fuel deteriorated or contaminated.
Is the fuel deteriorated or contaminated?
YES – Refuel with fresh fuel with the correct octane rating.
NO – GO TO STEP 4.
4. Intake air system inspection
Check for restriction or blockage of the air intake system.
Is the intake airway restricted?
YES – Clear the restriction.
NO – GO TO STEP 5.
5. Cylinder Compression
Check the cylinder compression (page 14-44).
Is the compression normal?
YES – Replace the ECM with a new one and recheck.
NO – GO TO STEP 6.
6. Valve clearance inspection
Inspect the valve clearance (page 3-15).
Is the valve clearance correct?
YES – Perform a leak down test before removing components.
NO – Incorrect valve clearance adjustment
TROUBLESHOOTING
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