Honda Civic 1998 Service Manual page 501

E lectrical Troubleshooting
Troubleshooting Flowchart - Countershaft Speed Sensor
I
. OBD ll Scrn Tool indicat€s Code
PO720.
. Solt-diagnosis Dj indicator
light blinks ninc times,
Po$ible C.u3o
. t"a*
". t*rlty ""."""t1*
botwoen the PCM .nd c.r har-
noss
. D i s c o n n e c t o d c o u n t a r s h a f t
soeod son3or connector
. Short or open in countorsh.ft
sp6ed sensor wirc
. F ulty count€.shrft speod 3en-
COUNTERSHAFT SPEED SENSOR
CONNECTOR
t'-tt
TT
9 l
t l
L I
TERMINAL SIDE OF MALE TESMINALS
PCM CONNECTOR B {25P)
WIRE SIDE OF FEMALE TERMINALS
14-62
ls the countershaft speed sensor
installed properly?
Measure Countorsh.ft Soeed Sen-
sor R6istanc€ al ths Senror Con-
nectot:
1. Disconnect the 2P connector
from the countershaft sDeed
sensof connector,
2, Measure the resistance oI the
countershaft sDeed sensor,
ls the resistance 400 - 600 0?
Chack Coume6hatt Spo€d Sensor
for a Short Circuit:
1 . D i s c o n n e c t t h e B ( 2 5 P ) c o n
nector from the PCM.
2. Check lor continoity between
the body ground and the 823
t e r m i n a I a n d 8 2 2 t e r m i n a l
individually.
Repair short in the wires belwe€n
the 823 and 822 torminals and
the countershaft soeed sensor.
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