Information - Honda CRF450R 2009 Service Manual
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Also See for CRF450R 2009:
- Owner's manual (64 pages) ,
- Service manual (465 pages) ,
- Owner's manual & competition handbook (172 pages)
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FUEL SYSTEM (PGM·FI)
PGM-FI TROUBLESHOOTING INFORMATION
GENERAL
TROUBLESHOOTING
Intermittent Failure
The
term
·intermittent
failure-
means a system may
have had
a
failure,
but
it checks OK
now.
If
the
MIL does
not come on, check
for poor contact or loose
pins
at aU connectors
related to the
circuit
that
of
the troubleshooting. If the MIL
was on,
but then
went out,
the
original
problem may be intermittent.
Opens
and
Shorts
·Opens·
and
·Shorts·
are common electrical
terms.
An open is a break in a wire or
at
a
connection.
A
short
is
an accidental
connection
of a wire to ground or
10
another
wire.
In
simple
electronics,
this usually means something will not work
at
atl.
With
ECMs this can mean something may
work,
but not the way it's supposed
to.
If
the MIL has
come
on
Refer
10
DTC READOUT
('09:
page 6-21
,
After
'09:
page
6-22).
If the MIL did not stay on
If the MIL did not stay on,
but
there is
a
driveability problem,
do the
SYMPTOM
TROUBLESHOOTING
(page 6-6).
SYSTEM
DESCRIPTION
SELF-DIAGNOSIS SYSTEM
The PGM-FI system is equipped with the self-diagnostic
system.
When any abnormality occurs in
the
system,
the ECM turns on
the
MIL
and stores
a DTC
in
its erasable
memory.
FAIL-SAFE FUNCTION
The PGM-FI
system
is provided with a fail-safe
function to
secure a
minimum
running capabitity even when
there
is trouble in the
system.
When any abnormality is detected by the self-diagnosis
function,
running capability is maintained by pre-programmed
values
in
the simulated program
map.
When any abnormality is detected in the
fuel
injector
andlor
CKP
sensor,
the fail-safe
function stops the engine to protect it
from
damage.
DTC
(Diagnostic
Trouble
Code)
The
DTC is composed of a main code
and
a sub code and it is displayed as a hyphenated
number when
relrieved from
the ECM
with the
MCS.
The digits in front of the hyphen are the main code
,
they indicate the component of function
failure.
The digils behind the hyphen are
the
sub
code,
they detail
the
specific symptom of
the
component or function
failure.
For
example,
in the case of the
TP
sensor.
-
DTC
DB
-
1 = (TP sensor voltage)
-
(lower than the specified
value).
-
DTC 08
-
2 = (TP sensor voltage)
- (higher
than
the specified value).
The
MAP. EeT,
TP
and
tAT
sensor diagnosis will be made according 10 the voltage
output
of
the
affected
sensor.
If
a failure
occurs,
the
ECM determines the
Function
Failure,
compares the sensor voltage output to the standard value, and
then outputs
the
corresponding DTC
to
the
MCS.
For example:
-
If the output voltage line (A) on
the MAP
sensor is opened,
the
ECM detects
the
output
voltage is about 5 V,
then the DTC
1-2
(MAP
sensor circuit high vol tage) will
be
displayed.
-
If the
input
voltage line (6) on the TP sensor is opened, the ECM detects
the
output voltage is 0 V, then
the
DTC 8-1 (TP
sensor
circuit
low voltage) will be displayed.
6-18
5V
MAP SENSOR
5V
>-'l+-
(AI
---<:_
....
OUTPUT VOLTAGE
'----¢----¢--,
5V
TP SENSOR
ECT SENSOR
IA T
SENSOR
5V
OUTPUT VOLTAGE
5V
-
....
t
OU
OUTPUT VOLTAGE
TPUT VOLTAGE
-!-
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Troubleshooting
