TOHATSU BFT115A Service Manual page 160

FUEL SYSTEM
DTC 41-4 (ABNORMAL CURRENT)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the A/F sensor 4P connector
fuse/relay junction box 23P connector
relay junction box 10P connector
connector A
Clear the DTC (page 5-6).
• Continue the procedure if the DTC does not
clear.
Start the engine and let it run at 3,000 min
5 minutes or more under no load until the engine
temperature is over 85 °C (185 °F).
Check the DTC using the HDS.
Does the DTC 41-4 appear?
YES
NO
2. Fuse inspection
Turn the combination switch OFF.
Check for blown No.3 fuse.
Is the fuse blown?
YES
NO
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
NO
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
NO
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
NO
5-42
, and then reconnect them.
12
– GO TO STEP 2.
– Temporary failure (code
reappear)
– 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).
– GO TO STEP 3.
– GO TO STEP 4.
– Replace the A/F sensor with a new one
and recheck.
– GO TO STEP 5.
– Replace the A/F sensor heater relay with a
new one and recheck.
– GO TO STEP 6.
– Replace the fuse/relay junction box with a
new one and recheck.
,
3
, fuse/
16
, and ECM
17
-1 (rpm) for
does not