TOHATSU BFT115A Service Manual page 163

2. A/F sensor line open circuit inspection
Turn the combination switch OFF.
Disconnect the A/F sensor 4P connector
ECM connector A
12
Check for open circuit between the A/F sensor 4P
connector main wire harness side No.1
3
(Black/Yellow) terminal and ECM connector A
main wire harness side No.27 (Black/Yellow)
terminal.
Check for open circuit between the A/F sensor 4P
connector main wire harness side No.2
3
(White/Black) terminal and ECM connector A
main wire harness side No.28 (White/Black)
terminal.
Is the A/F sensor line open?
YES – Repair open in the Black/Yellow wire or
White/Black wire.
NO – Replace the A/F sensor with a new one
and recheck. If the A/F sensor is replaced,
but DTC 48-5 still appears, replace the
ECM with a new one and recheck.
DTC 48-6 (SHORT CIRCUIT IN A/F SENSOR (AFV))
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 48-6 appear?
YES – GO TO STEP 2.
NO – Temporary failure
reappear)
2. A/F sensor AFV line short circuit inspection
Turn the combination switch OFF.
Disconnect the A/F sensor 4P connector
ECM connector A
12
Check for continuity between the A/F sensor 4P
connector main wire harness side No.2
3
(White/Black) terminal and engine ground.
Is there continuity?
YES – Repair short in the White/Black wire
between the ECM and A/F sensor.
NO – Replace the A/F sensor with a new one
and recheck. If the A/F sensor is replaced,
but DTC 48-6 still appears, replace the
ECM with a new one and recheck.
and
3
.
12
12
-1
(rpm) for
-1 (rpm) for 1
(code does not
and
3
.
FUEL SYSTEM
5-45