Honda SH125 Manual page 100

FUEL SYSTEM (Programmed Fuel Injection)
DTC
23-1
29-1
33-2
Function Failure
0 2
sensor heater
malfunction
IAC valve circuit
malfunction
ECM E2-PROM
malfunction
Causes
Loose or poorly connected
0 2
sen-
sor connector
Open or short circuit
in
the 0 2 sen-
sor heater wire
Faulty
0 2
sensor
Faulty IAC valve (in the ECM)
Faulty ECM
________
Symptoms
Engine operates nor-
mally
Engine operates nor-
mallv
Engine operates nor-
mally
Refer
to
Page
5-29
____
~
-___
5-30
5-30