Honda VFR800F 2014 Service Manual page 90

PGM-FI SYSTEM
PGM+I
TROUBLESHOOTING INFORMATION
GENERAL TROUBLESHOOTING
lntermittent
Failure
The
term
,,intermittent failure,' means
a system
may have had a
failure, but it
checks
oK
now.
lf
the MIL does
not come
on' check
for poor contact
or
loose pins at
all
connectors
relaied to the circuit
that
of
the
troubleshooting.
lf
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
to another
wire.
tn
simple electronics,
this
usually means something
will
not
work at
all with
ECM
if',ir
"rn
mean somethirig may work, but not the
way
it's supposed to'
lf the
MIL has
come on
Refer
to DTC READOUT
(Page
4-6)
lf the
MIL
did not
staY
on
lf the
MIL did not stay on. but
there
is a driveability problem, do
the
SYMPTOM TROUBLESHOOTING (page 4-8)'
SYSTEM DESCRIPTION
SELF-DIAGNOSIS
SYSTEM
The pGM-Fl
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-Fl system
is provided
with
a
fail-safe function to secure
a minimum
running
capability even
when there is
trouble in the
system.
when
any
uonJr.rritv
is detected ov
il
" ="ir-airgnosis
function,
running capanitity
is
maintained by pre-programed value
in the simulated program map,
when
any aonoimarity is-detected in
the
iniectir, cKP sensor. and/or
cMP sensor, the fail-safe
function stops
the engine to
protect it
from damage'
DTC
.
The DTC is
composed of a main code and a
sub code and it is
displayed as a hyphenated number
when
retrieved 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 digits
behind
the
hyphen are the
suo
cooe tr,ey deiail
the specific symptom
of
ihe component
orfunction failure'
For
example, in
the case of the
TP sensor:
-
DTC g3-1 = (TP sensor voltage)
-
(lower than
the
specified value)
-
DTC O3-2
=
(f e
sensor voltage)
- (higher than
the
specified value)
.
The
MAp,
ECT,
Tp and
IAT sensor diagnosis
will
be made according to the voltage output of the affected sensor'
lf
a failure occurs,
the ECM determines
the
Function Failure,
"ornp"ur",
the
sen-sor
voltage output to the standard
value'
and
then outputs the corresponding DTC to the MCS'
For examPle:
-
lf
the output voltage line 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
voltage] will be displayed'
-
lf
the
input vottage line on the
Tp
."nro,
i. lp6ned, the
ECM detects
the output
voltage is o
V, then
the DTC
8-1
(TP sensor
circuit low voltage)
will be displayed'
MIL BLINK PATTERN
.
lf
the
MCS rs
not
available,
DTC can be read from
the
ECM memory by
the
MIL blink pattern'
.
The number
of
MIL blinks is
the equivalent to
ir,e
main code ot trre
btC (the sub code cannot be
displayed
by
the
MIL)'
.
The
MIL
will
blink
the current DTC, in case
the ECM detects
the problem
at present,
when the ignition switch is
turned
oN
with
the engine
rtop
r*itit,
;c'aor
idling with the
sidestand
down.
The MIL
will stay
oN
when
the
engine
speed
is over 3,100 rpm or
with
the sidestand uP.
.
The MIL has
iwo types
of
blinks,
a long blink
and short blink.
The long blinking
lasts
for
1
3 seconds,
the short
blinking lasts
for
0.3 seconds. One long blink is
the equivalent of ten short blinks. For
&ample,-when two
long blinks are
followed by seven short
blinks,
the DTC is
27"$wo long blinks = 20 blinks, plus seven short blinks)
.
when the
ECM stores more than
one
orc,
ilre
Mil *itt
indicate
them
by'utint ing in
the order from
the lowest number
to highest
number,
MIL CHECK
when the ignition switch is
turned
oN
with the engine stop switch
"o", the MIL
will stay on for a
few seconds, then go
off
lf
the
MIL
does
not come on or stays
on, inspect
the
MIL circuit (page 4-42)
4-5