TOHATSU BFT115A Service Manual page 164

FUEL SYSTEM
DTC 48-7 (SHORT CIRCUIT IN A/F SENSOR (AFC))
1. Symptom reproduction test
Turn the combination switch OFF.
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).
Then run the engine at 3,000 min
minute.
Recheck the DTC with the HDS.
Does the DTC 48-7 appear?
YES
NO
2. A/F sensor AFC line short circuit inspection
Turn the combination switch OFF.
Disconnect the A/F sensor 4P connector
ECM connector A
Check for continuity between the A/F sensor 4P
connector
(Black/Yellow) terminal and engine ground.
Is there continuity?
YES
NO
5-46
– GO TO STEP 2.
– Temporary failure (code
reappear)
.
12
main wire harness side No.1
3
– Repair short in the Black/Yellow wire
between the ECM and A/F sensor.
– Replace the A/F sensor with a new one
and recheck. If the A/F sensor is replaced,
but DTC 48-7 still appears, replace the
ECM with a new one and recheck.
-1 (rpm) for
-1
(rpm) for 1
does not
and
3