Mil Code Index - Honda SH125 Manual

FUEL SYSTEM (Proarammed Fuel Iniection)
MIL CODE INDEX
The PGM-FI malfunction indicator lamp (MIL) denotes the failure codes (the number of blinks from 0 to 29). The MIL has
two type of blinks, a long blink and short blink. The long blink lasts for 1.3 seconds, the short blink lasts for 0.5 second.
When two long blinks occur, and three short blinks, that failure code is 23 (two long blinks
= 20
blinks, three short blinks
=
3 blinks). Then, go to the flow chart and see failure code 23.
When the engine control module (ECM) stores some failure codes, the MIL shows the failure codes in the order from the
lowest number to highest number. For example, when the MIL blinks once, then seven times, two failures have
occurred. Follow the flow chart for failure codes 1 and 7.
1
MIL
No blinks
I
8
blinks
r
21 blinks
r-
23 Blinks
r-
Function Failure
ECM power1
ground circuits
ma Ifu nctio n
MIL circuit
malfunction
Data link circuit
malfunction
MAP sensor
circuit
malfunction
ECT sensor
circuit
malfunction
TP sensor circuit
malfunction
IAT sensor circuit
malfunction
Fuel injector
circuit
malfunction
~
0 2
sensor circuit
malfunction
0 2
sensor heater
malfunction
IAC valve circuit
malfunction
Causes
Open circuit in the power input
wire of the ECM
Open circuit in the engine stop
relay related wires
Faulty engine stop relay
Open circuit in the bank angle
sensor related wires
Faulty bank angle sensor
Blown sub-fuse 10 A (IGN, At,
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)
-
START, FUEL PUMP)
Loose or poorly connected ECT
sensor connector
Open or short circuit in the ECT
sensor wire
Faulty ECT sensor
Faulty TP sensor (in the ECM)
Faulty IAT sensor (in the ECM)
Loose or poorly connected injec-
tor connector
Open or short circuit in the injec-
tor wire
Faulty injector
Loose or poorly connected
0 2
sensor connector
Open or short circuit in the
0 2
sensor wire
Faulty
0 2
sensor
Loose or poorly connected
0 2
sensor connector
Open or short circuit in the
0 2
sensor heater wire
Faulty
0 2
sensor
Faulty IAC valve (in the ECM)
Symptoms
Engine does not start
Engine operates nor-
Engine operates nor-
mally
mally
Engine operates nor-
mally
Hard start at a low tem-
perature (ECM controls
using preset value; cool-
ant temperature: 90 "C/
194
O F )
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 "CI77 O F )
Engine does not start
Engine operates nor-
mally
Engine operates nor-
mally
Engine operates nor-
mally
Refer
to
Page
5-48
-
-
5-11
5-11
5-1 3
5-1 3
5-1 3
5-15
5-17
5-18