Honda EP3 Service Manual page 248

ECM Inputs and Outputs at Connector E (31P)
l
t M o
F P R
2
$.c2s
i
6
SFIO2S
HTC
1
IV RLY
I
AFS
HTCR
9
tGl
1 4
FTP
1 5
ELD
1 6
EPS
L D
t 8 20
2,4/BS
21
VSV
22
BKSW
23
K LINE
24
SEFMJ
26
NEP
21
lvo
CD
29
scs
30
WEN
3 1
MIL
Wire side of female terminals
NOTE: Standard battery voltage is 12 V.
Terminal Wire color Terminalname
Description Signal
20
BLU/RED
2WBS (EVAPORATIVE
EMISSION (EVAP)BYPASS
SOLENOID VALVE)
Drives EVAP bypass
With ignition switch ON (ll): baftery voltage
solenoid valve
21
LT GRN/RED VSV (EVAPORATIVE
EI\4ISSION
iEVAP)
CANISTEB VENT SHUT
VALVE)
Drives EVAP canister vent
shut valve
W i t h i g n i l i o n s w i t c h O N ( l l ) : b a t t e r y v o l t a g e
22 WHT/BLK BKSW lBRAKE PEDAL
POSITION SWITCH)
Detects brake pedal
o o s i t i o n s w i t c h s i o n a l
With brake pedal released: about 0 V
With hrake nedal nresse.l: batterv voltaoe
23 LT BLU
K-LIN E
Sends and receives scan
With ignition switch ON (li)r pulses or battery
YEL
S E F M J
C o m m u n i c a t e s w i t h
m r l t i n l e Y e o n t r o l u n i t
With ignition switch ON (ll): about 5 V
With enoine runnino under load: DUlses
26
BLU
N E P ( E N G I N E S P E E D
PULSE)
Outputs engine speed pulse With engine running: pulses
21
RED/BLU
\40CD fl\4MOBTLTZER
CODE)
D e t e c t s i m r n o b i l i z e r s i g n a l
29 BRN
S C S ( S E R V I C E C H E C K
S I G N A L )
O e t e c t s s e r v i c e c h e c k s i g n a l
With the service check signal shorted with the PGM
Tester: about 0 V
Wiih rhe service check sional ooened: about 5 V
30
RED,A/VHT WEN (WRITE ENABLE
SIGNALi
D e t e c t s w r i t e e n a b l e s i g n a l
W i t h i g n i t i o n s w i t c h O N ( l l ) : a b o u t 0 V
GRN/ORN MIL (MALFUNCTION
INDICATOR LAMP)
Drives N4lL
With MIL turned ON: about 0 V
With MIL turned OFF: batterv voltaqe
( c o n t ' d )
11-23