Honda Civic Service Manual page 226

ECM Inputs and Outputs at Connector A (31P)
NOTE: Standard battery voltage is 12 V.
1
AFS]TC
2
]GP2
3
I G P l
^:^ I -:,
6
AFS+
1
CKP
I
KS
' 1 0
SG2
t 1 1 2
ACV
1 5
TPS
T 6
AFS_
1 8
V S S
1 9
IVAP
2A
vcc2
21
vccl
22
HTC+
23
LG2
25
CMPA
26
CMPB
(rDc)
27
tGPts,l
28
rcPts3
29
tGPts2
30
GPLS 1
Wire side ol female terminals
Terminal
numb€r
Who color forminal name
Description
Signal
ELKAVHT
AFSHTC (AIR FUEL RATIO
(4./F)SENSOR
HEATER
CONTROL}
Drives Ay'F sensor heater With ignit'on switch ON {ll): battery voltage
With fully warmed up engine runnang: 0 V
2 YEUBLK
IGP2 (POWEB SOURCE)
Power source for the ECM
circuit
With the ignition switch ON 1ll): battery voltage
With the ionition switch OFF: about 0 V
3 YEUBLK IGPl {POWER SOURCE)
Power source for the ECM With the ignition swatch ON {ll): battery voltage
With the ionition switch OFF: about 0 V
4 BLK
PG2 (POWER GROUND
Ground forthe ECM circuit
Less than 1.0 V at all times
5
BLK
PG1 (POWER GROUND
Ground forthe ECM circuit Less than 1.0 V at all times
6
RED
AFS + (AIR FUEL RATIO
(A,/F}SENSOR,
SENSOR 1
+ stDE)
Detects Ay'F sensor
{sensor 1) signal
1 8 L U
CKP (CRANKSHAFT
POSITION SENSOR)
Detects CKP sensor signal
With engine running: pulses
9
BED/BLU
) K S E N S O B ) Detects knock sensor siqnal With enqine knocking: pulses
1 0 YEL 2 {SENSOR ; R O U N D )
; R O U N D )
Sensor qrounr
Lessthan 1.0V at elltimes
G 1 { S E N S O R
Sensor qroun(
L e s s t h a n 1 . 0 V a t a l l t i m e s
12
BLIVRED IACV (IDLE AIR CONTROL
(IAC)VALVE)
Drives IAC valve
With engine runningr duty controlled
RED/BLK TPS (THROTTLE
POSITION
SENSOR)
Detects TP sensor signal With throttle fully open: about 4.8 V
With thronle fullv closed: ahout 0-5 V
REDI/EL AFS
(AIR FUEL RATIO
(4,/F)SENSOR,
SENSOB 1
SIDE)
Detects !y'F sensor
( s e n s o r 1 ) s i g n a l
1 8 WHT/GRN
V S S ( V E H I C L E S P E E D
S E N S O R )
Detects VSS signal Wath ignition switch ON (lli and front wheels
rotating: cycles from about 0 V to about 5 V or
( c o n t ' d )
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