TOHATSU BFT75A Service Manual page 122

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3. Fuel Flow Inspection
Inspect the fuel flow (page 5-99)
Is the fuel flow within specification?
YES
NO
4. Pressure regulator inspection
Check the fuel pressure and record it (page 5-97)
Disconnect the pressure regulator vacuum tube.
Check the fuel pressure.
Is the fuel pressure higher with the vacuum tube disconnected?
YES
NO
5. Valve clearance inspection
Inspect the valve clearance (page 3-12)
Is the valve clearance correct?
YES
NO
6. Neutral switch inspection
Inspect the neutral switch (page 9-22)
Is the neutral switch normal?
YES
NO
7. Fuel injector inspection
Inspect the fuel injector (page 5-103).
Is the fuel injector normal?
YES
NO
8. VTEC system inspection (BF90D/100A only)
Inspect the VTEC system
Is the VTEC system operating properly?
YES
NO
– GO TO STEP 4.
– • Clogged or damaged fuel tube
• Clogged fuel strainer (Low pressure side)
• Clogged water separator
• Clogged fuel strainer (Low pressure side)
• Clogged vapor separator air vent tube or filter
• Faulty vapor separator
• Clogged or damaged fuel feed hose
• Clogged fuel strainer (High pressure side)
• Faulty fuel pump (High pressure side)
– GO TO STEP 5.
– • Clogged pressure regulator vacuum tube
• Faulty pressure regulator
– GO TO STEP 6.
– Improper valve clearance adjustment
– GO TO STEP 7.
– Replace the neutral switch with a new one and recheck.
– • BF75D/80A: Replace the ECM with a new one and recheck.
• BF90D/100A: GO TO STEP 8.
– • Repair the open or short circuit in the fuel injector wire
• Faulty fuel injector
– Replace the ECM with a new one and recheck.
– Faulty VTEC system.
TROUBLESHOOTING
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