1999 HONDA CIVIC ECM connector

Circuit Diagram
UNDER-HOOD FUSE/RELAY 8OXIGNITIONSWITCH
WHT/8LI( +WHT
Brake systsm light
passenger's airbag
l----ltlI DUMMY II BESISTOR I
tll
tl
la rl
MEMORY ERASESIGNAT IMES)CONNECTOR I2P)
GRY{GRN)
I
BRN BRN
tl.-l- .-r-\./ \./
ECM/PCM SERVICECHECKCONNECTOR
ILT 8LU
I
t'7
DATA LINKCONNECTOR{DLC) {r6P)
GRY GRY(GRN) IGNN)
V:
G801
Teminalside oi thal€ terminals
24-6
4''
SRS UNIT TERMINALSG40tG402
SBS INDICATOR CIRCUIT{ln the gauge assembly)
PGM_FI
DRIVER'SAIRBAGINFLATOR
10 14 r 13 6 7(VAl 3{VBlSRS UNIT16 17 t5 9 18 8

Ground-to-Components I ndex
f.,lONOTE: All ground wires are BLK unless otherwise noted.
GroundPageComponents or Circuit Grounded
Battery (BLKYEL)
Steering pump bracket
t+-rg ITransmission housing
l
G101
(-1)
G101
(-2)
14-2
and
14-3
ano
14-1
Powertrain or engine control module (PG1 and pG2 are BLK: LG1 and LG2 are
BRN/BLK), EGR control solenoid valve (CW, EGR valve and lift sensor (Dt6yS enginewith M,/T), Engine coolant temperature switch, pGM-Fl main relay, power steeringpressure switch (USA), Primary HO2S (D16Y5 engine with l\/,/T), Vehicle speed sensor,VTEC pressure switch (D16Y5/D16Y8 engines), CKF sensor (BRN/BLK), Transmission
control module (CYf) (Pc1 is BLK: LG1 is BRN/BLK)
Shielding betvveen the PCM or ECM and these components (all have BRN/BLK wires):
CKF sensor, TDC/CKP/CYP sensor. Primary and secondary heated oxygen sensors.
Knock sensor (CWDl6YB engine), Mainshaft speed sensor (AiT except CVT),
I Countershaft speed sensor (A/T except CVf)
Shielding between the TCM and these components (CVT) (all have BRN/BLK wires):
Drive pulley speed sensor, Driven pulley speed sensor, Secondary gear shaft
speed sensor
Powertrain or engine control module (PG1 and pG2 are BLK; LG1 and LGz are
BRN/BLK), EGR control solenoid valve (D16Y5 engine), EGR valve (Dt685), Engine
coolant temperature switch, Fuel pressure regulator shut-off solenoid valve (D1685),
PGM-FI main relay, Power steering pressure switch (USA), Vehicle speed sensor, VTECpressure switch (All except D16Y7 engine), CKF sensor (A

except 81642) (BRN/BLK)
Shielding between the PCM or ECM and these components (all have BRN/BLK wires):
CKF sensor, TDC/CKP/CYP sensor, Primary and secondary heated oxygen sensors,
Knock sensor (All except D16Y7 engine), i/ainshaft speed sensor (Arf except CW),
Countershaft speed sensor (A,/T except CVf), Drive pulley speed sensor (CW), Drivenpulley speed sensor (CVT), Secondary gear shaft speed sensor (CVf)
I Badiator fan motor, Right front parking/turn signat tight, Right headtight
G20214-4I Cruise control actuator, Left front parking/turn signal lights, Left headlight, Rear window
I washer motor, Windshield washer motor, Washer fluid level switch (,99-'00 Canada)
G401| +-o
and
14-7
Accessory power socket, Brake fluid level switch, Clutch interlock switch (M/T), Clutchswitch (lillT with cruise/D16Y5 engine with MfD, Combination wiper switch (Z wires),
Cruise control main switch, Cruise control unit, Dash lights brightness controller, Data
link connector, Daytime running lights control unit (Canada), Gauge assembly, Horn('96-'97 models), Integrated control unit, Interlock control unit (ArI), Keyless door lock
control unit ('99-'00 models with keyless), Moonroof close and open relays, Moonroof
switch, Park pin switch (A/r), Power window relay, Rear window defogger relay, Rear
window defogger switch ('96-'98 models), Steering lock, Stereo radio tuner (,96-,98
USA: LX, EX, and HX), Turn signal/hazard relay, Windshield wiper motor.....plus
everything grounded through G402
6-6

lgnition System
- All '96-'98 Models except Dl685; '99-'00 Dl6Y5 with M/T
NOTE: For Service Check Connector details, see page 23-3.
@
CKP CYPsensor sensorinput input(CKPP) (CYPP)
X,*.,
rDcsensorInpur(IDCP)
POWERTRAINor ENGINECONTROLMODULE(PCM or ECM)
POWERTRAINor ENGINECONTROLMODULE(PCM or ECM)
xr*"
BLKI/EL
I
I
BLK/YEL
I See Power
H Distribution,
J__99'"'_
I
I
I
I
I
I
UNOER-OASHFUSE/RELAYBOX
"a*,telfi
u I """%t'3.
,rrrr.iFiFx".-,''ril'fi :T-DASH ll pagelo-1.FUSE/ I( FUSE 9
F.itl, Lq::---
".:lo63
10
BLK,YEL
10
c101
vlEW28
c'120
vlEW29
BLK
c14
c120
vlEW29
rIDcM) IGKPM) (CYPM)Sensor Sensor Sensolground ground ground
L-- - - -- -----J PHora 36
L-----------J
:L_1__I,
! iii:?ifq"l
I
**:'
*-"*,t";'
= PHO|O 33PHOTO 123ICW)
Secondary
ti <..-/4 i t
iLi:"_gl_i iL-----1!-----r
96- 97 models I 98- 00 modets
20
Spark Plugs

, r -.-- .l TBANSMTSS|ON
I igF"![E#'
:. lr-ri";l:';9""
POWERTRAINor ENGINECONTROL MODULE(PCM or ECM)PHO|O 86
lgoitionoutEltofl-
YEUGFN
c'l20
TESTTACHOMETEBCONNECTOR
DISTRIBUTOR
.I GAUGEI ASSEMBLY
iw,tr?,'
I
IJ
BIU
9
ALU
BLU
c120
vtEw 29
c101
vtEw 28
'. Y F,fl}l.BLU I viEw 60
cel
i i:*bi
rA*oxErEn
irlg:lL----- ----
20-1

lgnition System
- All Dl685 engines; All '99-'00 Models except Dl6Y5 with M/T
NOTE: For Service Check Connector details, see page 24-4 (except D1685) or 25-4 (D1685).
STEERINGLOCKPOWERTRAIN
lm- sii.- s*- iffffiEgr
I '8f", '3#n '3#n | (Pcn' or EcM)
L------ -----J Wro 86
',L_I__J,
!l---+--l !
'i---
j----i'
fl '","?siii,xl
I I I
i*n"'."
-"1 "-l '-l *"-^lr";J
I I I ='i.{i31i",,-
All except D1685D1685
gLK.Yer t
u l9f#'
fi
"*1,[
F,*';.,
!'T-f*-'i"i! {F+ Distdbution,
LJ_gg'n'_
i.x,r
9'x*"
-.t
iF--Hs-,mT-l
ll pase lGi. I
l( FUsEe I
!Lig::___J
.I UNDER-I DASH
a FUSE/
! RELAY- BOX
1 Y C419 UNDER-^,ol',lill,l?"u' rlir?IA) RELAYBOX
.t0
BLKI/EL
10(D16Y7/D16Y8 s)
c101
PHO|O 142 lA1685)vlEw 2a
c120
vtEw 29OFN/ALULT BLU orALU/GRN
BLU,^VEL
c120
vtEw 29
ELKWHT/BLU
7
FED
c21c9
ALK
c30
;;--;;---o;;;lSensor Sonsor Sensor I
POWERTRAINor ENGINECONTROLMODULE(PCM or ECM)
ground ground gtound
L ------ -----J PHoro 36
Sec!l|dary
Sparh Plugs
20-2

I
t
! c,orna, (LG1)
Referencevoltage(vcc1)
ServicecnecKconn€ctorInput(scs)
POWERTRAINolENGINECONTROLMODULE(PCM or ECM)PHOfO 86
MapsensorinputSensorground(sGl)
A10
Ground Ground Ground1LG2) (PG1) (PG2)
See GroundDistribution,page 14-2.
MANIFOLDABSOLUTEPRESSURE(MAP}SENSOR
PHO|A 49 p16v7l
See ABS,SRS
Y
I
--J
SERVICECHECKCONNECTOR
vtEw39See GroundDistribution,page 14-5.
I
I
___JSe€ Ground: c402
(cont'd)
24-3

Fans
- AllModels\,1 |
splicedtogetherinstead of inthe junctionconnector onDl6Y5 models
c211PHOTO 11
FANRELAYPrtofo 10
Se€ I'i CCompre€sorCont ols
1
ALKAED
a
c352
f BLKaEou Y 9,;%,.cFN I vIEw 5e
;
"'
T
";::-:.."-!
Y:. ---::Y h!ii'in"," :
I : ""'I 'is.2o) :
I i,o''ur,ff;, l;l:'l?'* i
I r- - -, |JBEI :
I ; I control | ;
I :L--J :I ' PoWERTRAIN ordu. ' ENGINE CONTROL '' MODULE
: (PCMoTECM) :I PHAfO 86I wEw 7allqA ----.ENGINECOOLANTTEMPERATUREswtrcH BLLPHO|O 33 ?
Ses GrolndDiskibution,oaqe 14.
,I
H
:I
i:
"'*
1_l
c7531
BLU/BLK
ALK2
BLK
RADIATORFANMOTORI
BLK
BLK1
ELK
c753
CONDENSERFANMOTOR
a
* czsr
page 14.
II
FJ'Glot
c211
Gro!nd
T
Se€ GroundOstribution,Pago 14.4"t1 - '96.f98: All models'99-'00: 016Y5 with M/I 01685"2 = '99-'00: Allmodels exceptD16Y5 with M/T and 01685
cof{oENs€R
* czor33123lCVIl
63

-
Component Connector View Index (Views begin on page 202-21
Connector View
ABS Control Unit........ ......63
Audio Unit ('99-'00 models) ......74
Combination Light Switch . . . . . . . . . . . . . . . 64
Combination Wiper Switch . . . . . . . . . . . . . . 65
Cruise Control Unit.... .....43
C\TTTransmission Solenoid ............. 25
Data Link Connector (DLC) ..... 48
Daytime Runnlng Lights Control Unit ..... 66
Engine control Module (ECM) ...........70
Exhaust Gas Recirculation (EGR) Valve
and Lift Sensor (D16Y5 Mfl, D1685) . . . . 10
Gauge Assembly .............71
HazardWarnlngSwitch,,. .,,,...,,,,... 32
Heater Control Panel ('96-'98 models) .....44
Heater Control Panel ('99-'00 models) ...., 76
Heater Fan Switch ('96-'98 models) ,,,.... 11
fniector Control Module (GX) ............77
I/
202-1
Connector View
Integrated Control Unit .......,. 67
f nterfock Control Unit .... ...... 26
Keyfess Door Lock Control Unit . . . . , . . . . . 75
Mode Control Motor ... ........'17
Moonroof Close Relay .. .......13
Moonroof Open Relay ... .......15
PGM-FI Main Relay .. .......... 18
Power Door Lock Conlrol Unil ..... ...... 37
Power Mirror Switch .,... ...... 33
Power Window Master Switch .,.........36
Powertrain Control Module (PCM) .......70
Security Control Unit ..., ..,,... 58
Security Starter Cut Belay ... ...,,,....,, 12
SRS Unit ............. 51
Stereo Radio Tuner ('96-'98 models) ...... 68
Transmission Control Module CICM) .....69