Honda SH125 Manual page 99

FUEL SYSTEM (Programmed Fuel Injection)
DTC
~
7- 1
______
7- 2
8- 1
~
8-2
9-
1
9-2
12-1
21-1
5-20
Function Failure
ECM power/
ground circuits
malfunction
MIL circuit
malfunction
Data link circuit
malfunction
MAP sensor
circuit l ow voltage
MAP sensor
circuit high
_ ~ _ _ _ _ _ _ _ -
voltage
ECT sensor circuit
l o w voltage
ECT sensor circuit
high voltage
TP sensor circuit
l o w voltage
TP sensor circuit
high voltage
IAT sensor circuit
l o w voltage
IAT sensor circuit
high voltage
Fuel injector
circuit
malfunction
0 2
sensor circuit
malfunction
Causes
Open circuit at the power input
wire of the ECM
Open circuit in engine stop relay
related wires
Faulty engine stop relay
Open circuit in bank angle sensor
related circuit
Faulty bank angle sensor
Blown sub-fuse 10 A (IGN, Al,
START, FUEL PUMP)
Faulty ECM
Open or short circuit in the MIL
wire
Short circuit in the data link con-
nector terminals
Short circuit in the data link con-
nector wire
Faulty ECM
Faulty MAP sensor (in the ECM)
~.
Faulty MAP sensor (in the ECM)
Short circuit i n the ECT sensor
wire
Faulty ECT sensor
Loose or poorly connected ECT
sensor connector
Open circuit i n the ECT sensor wire
Faulty ECT sensor
Faulty TP sensor (in the ECM)
Faulty TP sensor (in the ECM)
Faulty IAT sensor (in the ECM)
Faulty IAT sensor (in the ECM)
Loose or poorly connected injector
connector
Open or short circuit i n the injector
wire
Faulty injector
Loose or poorly connected
0 2
sen-
sor connector
Open or short circuit in the 0 2 sen-
sor wire
Faulty
0 2
sensor
Symptoms
Engine does not start
MIL does not blink
Engine operates nor-
MIL does not blink
Engine operates nor-
MIL stays lit
ma I ly
mally
Engine operates nor-
Engine operates nor-
mally
mally
Hard start at a l o w tem-
perature (ECM controls
using preset value; cool-
ant temperature: 90 "C/
194 OF)
Hard start at a l o w tem-
perature (ECM controls
using preset value; cool-
ant temperature:
90
"C/
194 OF)
Poor engine response
when operating the
throttle quickly (ECM
controls using preset
value; throttle opening:
0")
Poor engine response
when operating the
throttle quickly (ECM
controls using preset
value; throttle opening:
0°)
Engine operates nor-
mally (ECM controls
using preset value;
intake air temperature:
25 "GI77 OF)
Engine operates nor-
mally (ECM controls
using preset value;
intake air temperature:
25 "CI77 OF)
Engine does not start
Engine operates nor-
mally
Refer
to
Page
5-48
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5-22
5-22
5-23
5-24
5-25
5-25
5-25
5-25
5-26
5-28