Honda SH125 Manual page 109

FUEL SYSTEM (Programmed Fuel Injection)
3.
0 2
Sensor Heater Open circuit Inspection
Turn the ignition switch to OFF.
Disconnect the ECM 32P connector by releasing
the lock lever.
Check for continuity between the White termi-
nals of the
0 2
sensor 4P connector and ECM 32P
connector.
Is there continuity?
NO
-
Open circuit in White wire.
YES
-
GO TO STEP 4.
4. 0 2 Sensor Heater Short Circuit Inspection
Check for continuity between the 4P connector
terminal and ground.
Connection: White
-
Ground
Is there continuity?
YES
NO
-
Short circuit in the White wire.
-
Replace the throttle body/ECM assem-
bly with a new one, and inspect again.
DTC
29-1
(IAC VALVE)
1. Recheck DTC
Erase the self-diagnostic memory to reset the
ECM (page 5-81.
Start the engine and check the IAC valve with the
HDS.
Is the DTC 29-1 indicated?
NO
YES
-
Temporarily failure; the system is nor-
mal.
-
Replace the throttle body/ECM assem-
bly with a new one, and inspect again.
DTC
33-2 ( E2-PROM)
1. Recheck DTC
Erase the self-diagnostic memory to reset the
ECM (page 5-8).
Turn the ignition switch to ON and recheck the
ECM E2-PROM with the HDS.
Is the DTC 33-2 indicated?
NO
YES
-
Temporarily failure; the system is nor-
mal.
-
Replace the throttle body/ECM assem-
bly with a new one, and inspect again.
ECM 32P CONNECTOR
White
0 2 SENSOR 4P CONNECTOR
(Harness side)