Honda SH125 Manual page 96

FUEL SYSTEM (Programmed Fuel Injection)
MIL 23 BLINKS
( 0 2
SENSOR HEATER)
NOTE:
Before starting the troubleshooting, check the 0 2
sensor 4P connector for loose contacts or cor-
roded terminals, and recheck the MIL.
1.
0 2
Sensor Heater Resistance Inspection
Turn the ignition switch t o OFF.
Disconnect the
0 2
sensor 4P (black) connector
(page 5-47).
Measure the resistance between the sensor side
4P connector terminals.
Connection: White
-
White
Is the resistance below 13
L 2
[2OoC/68"F)?
NO
-
Faulty
0 2
sensor.
YES
-
GO TO STEP 2.
2.
0 2 Sensor Heater Power Input Line inspection
Measure the voltage between the wire harness
side 4P connector terminal and ground with the
ignition switch turned to ON.
Connection: Black/white (+)
-
Ground
(-1
Does the battery voltage exit?
NO
-
Open circuit in the BlacWwhite wire.
YES
-
GO
TO STEP 3.
3.
0 2 Sensor Heater Open circuit inspection
Connect the test harness between the ECM con-
nectors (page 5-9).
Check for continuity between the test harness
terminal and wire harness side 4P connector ter-
minal.
Connection: #23
-
White
Is there continuity?
NO
-
Open circuit in White wire.
YES
-
GO TO STEP 4.
.___-
5 R
i 8 9 ' ( i l l 1 2 1 3 4l5W
I I
0 6 0 0 0 0 0 0 0 0 0 6 0 0 0 0
0
b
0
Q 0
0
0:
0'0 0 0 0 0
- J I _ - - - 1 C
0 2
SENSOR 4P CONNECTOR
(Harness side)
5-1 7