Ecm Lnputs And Outputs At Connector E (31P) - Honda EP3 Service Manual

Fuel and Emissions Systems
System Descriptions (cont'dl
ECM lnputs and Outputs at Connector E (31P}
L
u
1
i M o
F P R
2
sr-{]zs
3
LG3
4
SG3
6
$1025
HTC
1
M RLY
8
AFS
HTCR
I
1 4
FTP
1 5
ELD
1 6
EPS
L D
1 8
ACC
20
Z/VBS
21
VSV
22
BKSW
23
K-LINE
24
SEFMJ
26
NEP
21
rMo
CD
29
scs
30
WEN
3 1
MIL
Wire side of female terminals
NOTE: Standard battery voltage is '12 V.
Terminal
number
Wire color
ferminal name
Description
Signal
GRNI/EL
IMO FPR (IMMOBILIZER
FLJEL PUMP RELAYI
D r i v e s P G M F l m a i n r e l a y 2
0Vfor2 seconds after turning ignition switch ON
{ll). then batterv voltaoe
2
WHT/RED SHO2S (SECONDARY
HEATED OXYGEN SENSOR
(SECONDARY
HO2S),
SENSOR 2r
Detects secondary HO2S
{sensor 2) signal
With throttle Jully opened from idle with fully
warmed up engine: above 0.6V
With throttle quickly closed: below 0.4 V
3
BRN/YEL LG3 (LOGIC GROUND)
cround forthe ECM/PCM
controlcircuit
Less than 1.0 V at all times
4
P N K
SG3 {SENSOR GBOUND)
Sensor oround
Less than 1.0 V at all times
5
YEUELU
VCC3 {SENSOR VOLTAGE) Provides sensor voltage
With ignition switch ON (ll): about 5 V
With ionition switch OFF: about 0 V
6
BLKATr'HT SO25HTC (SECONDARY
HEATED OXYGEN SENSOR
(SECONDARY
H02S)
HEATER CONTROL)
Drives secondary HO2S
heater
With ignition switch ON (ll): baftery voltage
Wilh fullv warmed up engine running: dul,
controlled
1
REDA/EL MRLY (PGM.FI MAIN
RELAY}
Drives PGM-Flmain relay 1
Power source forthe DTC
With ignition switch ON (ll): about 0 V
With ignition switch OFF: battery voltage
I O R N AFSHTCR {AIR FUEL BATIO
(Iy'F)SENSOR
HEATER
CONTROL RELAY)
Drives air fuel ratio sensor
heater relay
With ignition swirch ON {ll): 0 V
I
YEUBLK
I G l ( I G N I T I O N S I G N A L )
D e t e c r s i g n i t i o n s i g n a l
With ignition switch ON (ll): battery voltage
With iqnition switch OFF: about 0 V
't4
LT GRN FIP lFUEL TANK
PRESSURE (FTP) SENSOR)
Detects FTP sensor signal With ignition switch ON (ll) and fuel fill cap open:
about 2.5 V
GRN/RED ELD (ELECTRICAL
LOAD
DETECTOF)
Detects ELD signal
With ignition swjtch ON itt):aOoutO.t V l-gV
(deDendino on electrical load)
LT GRN/8LK EPSLD (ELECIRICAL
POWEB STEEBING LOAD
DETECT)
Detects Power steering load
s r g n a l
At idle with steering wheel in straight ahead
position: about 0 V
At idle with steering wheelatfull lock: momentary
'18
RED
ACC (Ay'C CLUTCH RELAY) Drives P,/C clutch relay
With compressor ON: about 0 V
With comoressor OFF: batterv voltaoe
11-22
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