Honda VFR800F 2014 Service Manual page 98

PGM-FI SYSTEM
DTC e (lAT SENSOR)
IAT SENSOR
Probable cause
.
Open
or
short circuit in the
Gray/blue
wire
between
the sensor unit
and ECM
.
Open circuit
in the Gray
wire between
the
sensor
unit and ECM
.
Faulty IAT sensor
.
FaultY
ECM
DTC 9-1
(lAT SENSOR
LOW
VOLTAGE)
1.
IAT
Sensor SYstem
lnsPection
Check
the
IAT sensor with the MCS'
Isabout0Vindicated?
YES
-
GO
TO
STEP
2,
NO -
lntermittent failure
2.
IAT
Sensor lnsPection
Turn
the
ignition switch OFF'
Disconneci
the IAT sensor
2P
(Gray)
connector
(page 7-12).
Cnecf
tfre IAT sensor with the MCS'
ls
about0V
indicated?
YES
-
GO
TO STEP 3.
NO -
FaultY
IAT sensor
3.
IAT Sensor
Output Line
Short Circuit lnspection
Turn
the
ignition switch OFF.
Disconneit the
ECM 33P (Gray) connector (page 4-
42).
Check
for continuity between
the wire harness side
IAT sensor
2P (Giay)
connector
[1] terminal and
ground.
CONNECTION: GraY/blue
-
Ground
ls
there
continuitY?
YES
-
Short circuit
in
the
Gray/blue wire
NO -
Replace
the ECM
with a known good
one
and recheck.
ECM
5V
-l-
{
i
-1
4-21
...".-
Gr/Bu
-Gr