Honda SH300 2006 Manual page 138

FUEL SYSTEM (PGM-FI)
DTC 21-1 (O
• Before starting the inspection, check for loose or
poor contact on the O
recheck the DTC.
1. O Sensor Line Open Circuit Inspection
2
Turn the ignition switch OFF.
Disconnect the ECM 33P connector and O
sor cap connector.
Check the continuity between the ECM 33P con-
nector of the wire harness side and O
cap connector of the wire harness side.
Connection: Black/Orange – No. 3
TOOL:
Test probe
Are there continuity?
YES
NO
2. O Sensor Line Short Circuit Inspection
2
Disconnect the ECM 33P connector.
Check for continuity between the ECM 33P con-
nector of the wire harness side and ground.
Connection: No. 3 (Black/orange) – Ground
TOOL:
Test probe
Is there continuity?
YES
NO
3. O Sensor Inspection
2
Replace the O
(page 6-76) and clear the DTC.
Reset the ECM (page 6-12).
Start the engine and warm the engine up to cool-
ant temperature is 80 °C (176 °C).
Test-ride the scooter and check the O
with the HDS pocket tester.
Is the DTC 21-1 indicated?
YES
NO
6-28
SENSOR)
2
sensor cap connector and
2
(Black/Orange)
07ZAJ-RDJA110
– GO TO STEP 2.
– Open circuit in Black/orange wire
07ZAJ-RDJA110
– Short circuit in the Black/Orange wire
– GO TO STEP 3.
sensor with a known good one
2
– Faulty ECM. Replace it with new one
and recheck
– Faulty original O sensor
2
sen-
2
CAP CONNECTOR (Wire side of
female terminal)
sensor
2
Bl/O
sensor
2
33P CONNECTOR (Wire side of
female terminal)
Bl/O
33P CONNECTOR (Wire side of
female terminal)