TOHATSU BFT115A Service Manual page 193

2. Fuse inspection
Turn the combination switch OFF.
Check for blown No.3 fuse.
Is the fuse blown?
YES – Replace the blown fuse and check for
short in the main wire harness or incorrect
load by referring to the fuse load chart
(page 4-14).
NO – GO TO STEP 3.
3. A/F sensor heater inspection
Turn the combination switch OFF.
Inspect the A/F sensor heater (page 5-139).
Is the A/F sensor heater normal?
YES – GO TO STEP 4.
NO – Replace the A/F sensor with a new one
and recheck.
4. A/F sensor heater relay inspection
Inspect the A/F sensor heater relay (page 10-13).
Is the A/F sensor heater relay normal?
YES – GO TO STEP 5.
NO – Replace the A/F sensor heater relay with a
new one and recheck.
5. Fuse/relay junction box inspection
Inspect the A/F sensor heater relay circuit in the
fuse/relay junction box (page 10-14).
Is the fuse/relay junction box normal?
YES – GO TO STEP 6.
NO – Replace the fuse/relay junction box with a
new one and recheck.
FUEL SYSTEM
5-75