Honda VFR800F 2014 Service Manual page 104

PGM.FI SYSTEM
3.
CKP
Sensor Line Short Circuit lnspection
Check for continuity between
the wire harness side
CKP sensor 2P (Black) connector
['1]
and ground
CONNECTION:
Yellow
-
Ground
ls
there
continuitY?
YES
-
Short circuit in the
Yellow wire
NO -
Replace
the ECM
with
a
known good
one
and recheck.
DTC 21(Oz SENSOR)
Probable cause
.
Open
or
short circuit in
the Black/red
wire between
the
ECM and
Oz
sensor
.
Open circuit in
the Gray
wire between
the 02 sensor
and ECM
.
FaultY
02 sensor
.
Faulty ECM
DTC 21-1 (Oz SENSOR)
NOTE:
.
Before starting
the
inspection,
check
for
loose or
poor contact on the O, sensor
4P (Black)and ECM
Sae
lCray;
connectors,
and recheck
the
DTC'
1.
Recheck DTC
Erase
the DTC
(Page 4-7).
Stari
the engine and
warm
it up until the
coolant
temperature
is
80'C
(176'F)
Stop
the
engine.
Check
the
Oz
sensor with the MCS-
ts the DTC
21'1
indicated?
YES
-
GO TO STEP 2.
NO -
lntermittent failure
From engine stoP relaY
4-33