TOHATSU BFT250A Service Manual page 104

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TROUBLESHOOTING
6. Neutral switch inspection
Inspect the neutral switch (page 9-20).
Is the neutral switch normal?
YES
NO
7. Fuel injector inspection
Inspect the fuel injector (page 5-116).
Is the fuel injector normal?
YES
NO
8. VTEC system inspection
Inspect the following VTEC system:
– Solenoid valve (page 5-125)
– System operation (page 14-37)
Is the VTEC system operating properly?
YES
NO
ENGINE SPEED DOES NOT STABILIZE DURING RUNNING AT HIGH SPEED AND ENGINE SPEED IS
NOT AS HIGH AS IT USED TO BE DURING RUNNING WITH THE THROTTLE FULLY OPEN
1. Throttle cable inspection
Inspect the throttle cable (page 3-11).
Is the throttle cable adjustment correct?
YES
NO
2. Fuel Flow Inspection
Inspect the fuel flow (page 5-113).
Is the fuel flow within specification?
YES
NO
3. Fuel inspection
Check to see if the fuel deteriorated or contaminated.
Is the fuel deteriorated or contaminated?
YES
NO
4. Intake air system inspection
Check for restriction or blockage of the air intake system.
Is the intake airway restricted?
YES
NO
4-12
– GO TO STEP 7.
– Replace the neutral switch with a new one and recheck.
– GO TO STEP 8.
– • Repair the open or short circuit fuel injection wire
• Faulty fuel injector
– Replace the ECM with a new one and recheck.
– Faulty VTEC system.
– GO TO STEP 2.
– Improper throttle cable adjustment (page 3-11).
– GO TO STEP 3.
– • Clogged fuel strainer (Low pressure side) (page 3-27)
• Clogged water separator (page 5-93)
• Clogged or damaged fuel tube
• Faulty fuel pump (Low pressure side)
• Clogged vapor separator air vent tube or filter
• Clogged fuel feed hose
• Clogged fuel strainer (High pressure side) (page 5-106)
• Faulty vapor separator (page 5-115)
• Faulty fuel pump (high pressure side)
– Refuel with fresh fuel with the correct octane rating.
– GO TO STEP 4.
– Clear the restriction
– GO TO STEP 5.