Honda Civic Service Manual page 524

DTC 22: Vehicle Speed Sensor Signal
DTC 23: Engine Speed Signal
NOTE:
. lf the MIL indicator is ON, troubleshoot the PGIVI-Fl
system first.
. Even though the system is operating normally, the
EPS indicator will come on under the following
conditions.
- C o n d i t i o n 1 :
. The vehicle was traveling at least '12.4 mph
(20 km/h), then
. A rapld change in vehicle speed was detected,
t h e n
. T h e v e h i c l e ( o r t h e v e h i c l e s p e e d s e n s o r s i g n a l )
stopped for at least 5 seconds, and
. The engine speed was still 1,640 rpm or higher for
at least 5 seconds
- Condition 2:
After the vehicle (or the vehicle speed sensor
signal) has stopped for at least 10 seconds, yetthe
e n g i n e s p e e d w a s s t i l l 1 , 6 4 0 r p m o r h i g h e r f o r a t
least 20 seconds.
- Condition 3:
W h e n t h e v e h i c l e s p e e d i s 1 0 k m / h ( 6 . 2 m p h ) o r
a b o v e a n d t h e e n g i n e i s r u n n i n g a t 2 8 0 r p m o r
below for 3 seconds.
1. Start the engine and check the tachometer.
ls the tachometer working correctly?
YES- Go to step 2.
N O - G o t o s t e p 9 .
2. Test-drive the vehicle above 15 km/h {9.3 mph).
ls the speedometer working correctly?
YES Go to step 3.
NO-Perform the speedometer system
troubleshooting {see page 22-651.a
3 .
Block the rear wheels and raise the vehicle, and
make sure it is securely supported.
T u r n t h e i g n i t i o n s w i t c h O N ( l l ) .
Block the right front wheel, and slowly rotate the
left front wheel, and measure the voltage between
E P S c o n t r o l u n i t c o n n e c t o r C ( 2 0 P ) t e r m i n a l N o . 7
a n d b o d y g r o u n d .
EPS CONTROL UNIT CONNECTOR C {2OP)
Does the voltage pulse 0 V and 5 V?
YES Go to step 6.
NO Repair open in the wire between the EPS
control unit and the VSS. lf the wire is OK,check for
a loose or poor connections at the EPS control unit.
lf necessary, substitute a known-good EPS control
u n i t , a n d r e c h e c k . l
(conr'd)
4 .
5 .
Wire side of female terminals
17-33