BF135A•BF150A
5-50
DTC 48-6: A/F sensor V current is abnormal
1. Symptom reproduction test
-1. Connect the HDS pocket tester and clear the DTC
once. If the DTC can not be cleared, go on the trou-
bleshooting.
-2. Start the engine and warm it up 5 minutes or more by
running the engine at 3,000 min
-1
(rpm) under no load.
-3. Check the DTC again using the HDS pocket tester.
Does the DTC 48-6 appear?
YES –
Perform “2. A/F sensor line short circuit
check”.
NO –
Temporary failure (Disappeared)
2. A/F sensor line (V line) short circuit check
-1. Turn the ignition switch OFF. Disconnect the A/F sen-
sor connector and the ECM connector A.
-2. Check for the continuity between the No. 1
(White/Black) terminal of the A/F sensor harness side
4P connector and the engine ground.
Is there the continuity?
YES –
Repair short in the wire between the A/F sen-
sor and the ECM.
NO –
Replace the A/F sensor and recheck. If there
is any abnormality, substitute a known-good
ECM and recheck.
DTC 48-7: A/F sensor C current is abnormal
1. Symptom reproduction test
-1. Connect the HDS pocket tester and clear the DTC
once. If the DTC can not be cleared, go on the trou-
bleshooting.
-2. Start the engine and warm it up for 5 minutes or more
by running the engine at 3,000 min
-1
(rpm) under no
load.
-3. Check the DTC again using the HDS pocket tester.
Does the DTC 48-7 appear?
YES –
Perform “2. A/F sensor line short circuit
check”.
NO –
Temporary failure (Disappeared)
2. A/F sensor line (C line) short circuit check
-1. Turn the ignition switch OFF. Disconnect the A/F sen-
sor connector and the ECM connector A.
-2. Check for the continuity between the No. 2
(Black/Yellow) terminal of the A/F sensor harness
side 4P connector and the engine ground.
Is there the continuity?
YES –
Repair short in the wire between the A/F sen-
sor and the ECM.
NO –
Replace the A/F sensor and recheck. If it is
abnormal, substitute a known-good ECM and
recheck.
A/F SENSOR HARNESS
SIDE 4P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
AFV1
(WHITE/BLACK)
A/F SENSOR HARNESS SIDE
4P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
AFC1
(BLACK/YELLOW)