circuit HONDA CIVIC 1998 6.G Workshop Manual

- Under-hood ABS Fuse/Relay Box
Fuse
Number
(To underhood ABS fuse/relay box w re harness)
ABS pump motor
| 10-14 I ABS control unit
i ABS control unit
component or circuit ProiectedFuse Name
PUMP MOTOR
I ABS +B
ABS PUMPMOTOR RELAY(To main wire harness)
(To rnain wlre harness)
I!,ITR CHECK
6.3

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

- Automatic Transmission (All except Dl685)
NOTE: For cars equipped with optional security system, see Security System, page 133-3, .133-7, or 133-12
for starting system circuit schomatic.
Starting System
c3s2PHO|O IvlEw 27
ftxiE "2E1404
WHT/BLK
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lta":
c415
=-mF,Uf.
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9,lLT i ld;f,,"-
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It
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pag€ 10.
slan?(ll)
c415
I
Ji.I ELECTRICALI roAoI DETECTOR
I Gt ol ulra Ptfifo I
IJ
BLKAIVHT1
ELK./YEL
au(|vEL
BL'(4I/HT
4
c416PHOTO 53
c4t 6PHO|O 53PHO|O 56 f98 'oo)vtEw t2
c433
Vehiclss pre-wired foraccessory securaty system(Not Used)
R'SE 4IlA??tNY,olALXAVHY'10
Allsxcsptow aLKlvHrcwSoe Pow6r IDistibution, !page 10. a- ----JT1PHOTO 9
BATTERY
BLKAVHT
7
L-----L---JBLKFED
13:;-1ifl;ft?R
!-
)2 'lPHoto tg
a
BLI(RED
1I
ELIVBED
ALKNED
c433PHOTO 76
Soe PowrDslributbn,Pa€o 10.
9 a c101
er.xiwxr I ffo,rtfl't
c4rIPHO|O 63
Ft gg 3r5? F En 3E ^r7.94
4
r'STARTERPHO|O 34UNDER.DASHFUSE/RELAYBOX
A13
tl
II{TEGRATEDco|{TnoLUT{ITPHOfOUvtEw 67,--==--J
Sso PGM-FI, page&1 ot 24-1.
21
lGl

- Manual Transmission
NOTE: For cars equipped with optional security system, see Security System, page 133-3, or 133-7, or 133-12
for starting system circuit schematic.
Starting System
c3s2PHOTA 8vtEw 27
WHT/BLKc415
FUSE 42to!a0a
UNDER-HOODFUSE/RELAYBOXI
I
I
_l
IELECTBICALIOADDETECTOR(ELO) UN|TPtloro I
Sae Po'/Y€rDislibution,pag€ 10.------JT1
Se6 GroundDislribution,page 14-6.
BATTERY
STARTERCUTRELAY
PHO|A 129198)PllO|O r35 f99 00)
a
BLK/FED
9
BLKAVHT
ct01
vlEW 2A
c4't9
vtEw 49
FUSE 31STAATER SICIIAL7.5A
STARTER
4
Sse PGM-FI,page 231ot 2+1.
UNDER-DASHFUSE/RELAYBOX
At3
tl
tl
INTEGRATEDcol{tRoLut{llPHO|O U
r.------T-------------=;-*^:-lsrEERtNG
I i 1'----> R*.|?xf: iiiliffi' t"t%?I,,I Distribulion.1j;cx y' page 10.(0)
it-jtr'tl i
j
r---_-_€rx^,:jF;f
;-;:.==:t A r,+lo'tii:,J?"""
;--;*;.-f -- ^.:---.---1--
,'rr-'OO .o0"," 3,rffiEj,
---;;;;i[
cLUrcH TNTERLOCK tClosed wrlh clutch pedal Ifully depressed. llPHoro 1ra I"**"
!
Se€ PowerDistibution,page 10.
4('98100 models 3)ALU/BLK
f2 lE--r.---?q_l srAFrEn
21-2
I- G1

PGM-FI (All '9G'98 Models except Dl685; '99r0O D16y5 with M/T)
TRANSMISSIONCONTROLMODULE (TCM)
llEv/ 69
ECM ECMcontrol controlReference data datavollage inDutNREF) OMA}:q{.J
(VREF) OMA) OMB)Reference ECM ECMcontroldatajnput
EGRcontrol shift' I solenoid
i
-l
"""'"x :i1",'
sofenoid lock Pa(klvave Circult neutr; I vave circuit neutral| | control control inPut, ! (EsOLr {sru, (A}FNP):L------
voltag€ controldataoutput
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ta
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' circuit neutral Reverse D4 D3 2 indtcator, ;' control input input input input input control | -,| (sLU) rAlPNPr TATPFI {ATpO4i dlPD3) tAfPzr rDa rNDl | /
[J=:ITTIT'{t
' Interlock See Automatrc: Svstem Transmission Controls I
i i controt
i
"'J;:;;,.,"^,
!
l1l
"lL
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".f:;;,.,"^, 1.,."n,
: I lt ti.."stEBkTJBi ""il*l"*
: | /" I SOLENOTD VALVE
i \J PHaro 12a I
i
t'i!",,,
Bi"ifit**1
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i l ;;;a ',, pase 14 !'#$tl ii{"Ff*,
i
*-1.
---f !.gg1mr..
' 4 cror| - PHAfO 123
23-6

- How the Gircuit Works
With the ignition switch in ON (ll) or START (lll),
battery voltage is supplied through fuse 15 and
the BLI(WHT and BLK/YEL wire to the vehicle
speed sensor (VSS). The sensor is grounded by
the BLK wire to G1 01 . The speedometer and
other control units in the circuit supply about 5
volts to the BLU/WHT wire. The vehicle soeed
sensor (VSS) intermittently grounds the
BLUMHT wire which generates a pulsed signal
in it. The number of pulses per minute
increases/decreasos with the soeed of the car.
Reter to th€ Service Manual (Section 23, Electrical)
tor specific tosts or troubleshooting procedures.
33-1

Gruise Control (cont'd)
- How the Circuit Works
The cruise control system uses mechanical and
electrical devices to maintain the car's sDeed at a
setting selected by the driver.
System Description
The cruise control unit receives command signals
from the crurse control main switch and the cruise
control SeVResume switch. With the ignition switch
in ON (ll) or START (lll), voltage is provided to the
cruise control main switch through fuse 14. When
you push the switch to ON, power is provided to the
cruise control unit and the brake switch.
The cruise control unit receives information about
operating conditions from the brake switch, the
vehicle speed sensor (VSS), and the clutch switch
(manual transmission) or the A,/T gear position
switch (automatic transmission). The cruise control
unit then sends signals to the cruise control actuator
which regulates the throttle position to maintain the
selected speed. The conlrol unit compares the
actual speed of the car to the selected speed. The
control unit then uses the result of that comoarison
to open or close the throttle.
The brake switch releases the system's control of
the throttle at the instant you press on the brake
pedal. The switch sends a signal to the control unit
by removing power from the normally closed brake
input (GRY wire), and providing power at the
normally open brake input (GRN/vVHT wire). The
control unit responds by allowing the throttle to
close. The clutch switch or the A,/T gear position
switch sends a "disengage" signal to the control unit
that also allows the throttle to close.
The cruise control system will set and automatically
maintain any speed above 25 mph (40 km/h). To set
it, make sure the main switch is on and the switch
indicator is on. Then, after reaching the desired
speed, press the SET switch. This sends a "set"
signal to the cruise control unit which, in turn,
controls the cruise control actuator to maintain the
set speed.
When you push the SET switch and the cruise
control system is on, the "cruise control" ON
indicator lights up.
34-4
(
You can cancel the cruise control system by
turning the main switch off . This removes power to
the control unit and erases the set speed from
memory. lf the system is disengaged temporarily
by the brake switch, or clutch switch, and the car's
speed is still above 25 mph, press the resume
switch: the car will automatically return to the
previously set speed.
For gradual acceleration without pressing the
accelerator pedal, push the RESUME switch and
hold it there. This will send an "acceleration" signal
to the control unit. When you release the switch, the
system will be reprogrammed for the new speed. To
slow the car down. oush the SET switch in and hold
it there. This sends a "deceleration" signal to the
control unit, causing the car to coast. When the
desired speed is reached, release the SET switch.
This reprograms the system tor the new speed.
Refer to the Service Manual (Section 23, Electrical)
tor specific tests or troubleshooting procedures.
(
a

A/T Controls (All GX and All '99-'00 Models except CVI)
a
i-l-;;;
-rffi;----t
H*B'""i
! l r*-* i iflsln- :eepower ii|iii '
L_l____ _-i"utuiF#'i8 Y 93-s_1 SY C3s2 :""'".u I i,i?lol *"'o"n I iffl,1of
ll see eower ll wxrcnl - see power :
@
c131
vlEw 59
See GroundDistribulion,page 14-5. 1
["*
t*,t*;,,
;ffi i-
iilnirir,
Distribution,page 10-5.
,D5
, ry8 SOr)I Power source
BLI(YEL
il
10
WHT/BLU
821
(VBU)
Banery input
Servicecheck Vehicls Linear sol€noidconneclor speednput
' for solenoid valve ; \
Lock-up controlsolenoid valve (valve control circuitShift lock \
c'124
a
inpulinput
{8KSW)Brake switchInput
Shilt control solenoidvalve control
:::l
",:::[""::
. | .ir:Til**'
''lizll:l,,' i*'";l'-.----.'
O rr<( !!e"A65,
""il
SERVICE CHECKCONNECTOR
c12A
LTGRN/
I
SH IFTCONTROLSOLENOIDVALVES
LOCK.UPCONTROLSOLENOIDVALVESL__l+: G402a
il*-
except GX
See Powerr?F.| BRAKE SWTTCH
| | Closed with brake
| 1-I | !;€ja oeo'"""o
39-8

- How the Circuit Works
The anti-lock brake system (ABS) prevents locking
of the wheels as a result of heavy braking and/or
poor lraction. A vehicle with locked wheels cannot
be steered. The anti-lock brake system controls the
application of the brakes, allowing the driver to
maintain control of the steering.
Under anti-lock conditions, the antilock brake
system (ABS) modulates the pressure of the brake
tluid to each brake caliper. This system is a four
channel system: the pressure at each caliper is
controlled independently of the pressure al any
other caliper. Whenever a wheel is likely to lock
dunng braking, the anti-lock brake system
modulates the brake oressure at that wheel. When
the brake pressure is reduced to the point where
there is no longer any possibility of wheel locking,
the system returns to the conventional braking
system mode of operation.
Battery voltage is applied at all times through fuse
63 to the ABS control unit. When the ignition switch
is in ON (ll), battery voltage is supplied to the
control unit through fuse 16. The control unit is case
grounded. Inputs are received from the brake switch
and the individual wheel sensors located at each
wheel. The ABS control unit uses these inputs to
control the modulator solenoid unit. The solenoids
adjust the hydraulic pressure applied to each
calioer.
The ABS control unit has a self-diagnosis function.
When the control unit detects a fault, it turns on the"ABS" indicator and disables the anti-lock brake
system. lf the fault is not in the conventional braking
system, the brakes will continue to operate normally
but without the anti-lock feature.
Refer to the Service Manual (Section '19,
Anti-Lock Brake System) for specific tests or
troubleshooting procedures.
44-3

- How the Circuit Works
'96198 Models
The air delivery system directs the flow of air used
by the heater and air conditioner systems.
Mode Selection
Mode selection is controlled by the mode switches
in the heater control panel and the mode control
motor. When you select a specific mode, voltage is
applied through the dimming circuit to the LED,
which comes on, indicating the mode selected.
Ground is orovided to the mode control motor
though that mode switch. The motor then runs until
the air control door reaches the proper position.
Fresh/Recirculation 56lection
When you press the fresh or recirculation button, a
ground signal is sent from the heater control panel
to the recirculation control motor. The motor then
runs until the recirculation door reaches the proper
position. Battery voltage is also applied through the
dimming circuit to the corresponding LED, and the
LED comes on.
Refer to the Service Manual (Section 21, Heater) for
specitic tests or troubleshooting proc€dures.
'99J00 Models
The heater control panel receives battery voltage at
all times through fuse 47. With the ignition switch in
ON (ll), voltage is supplied to the heater control
panel through fuse 17. The control panel is
grounded at G402.
The heater control panel controls the air delivery
motors, and supplies a 5 VDC reterence voltage to
the air mixture control motor.
The air mixture and mode control motors each
receive inputs trom the heater control panel. The air
mix motor regulates the mixture of cold and hot air
by varying the position of the heater-evaporator doot
The mode control motor controls the direction and
volume of outlet air. The air flow can be directed to
the dashboard vents or the corner vents.
Both the air mixture control molor and mode control
motor are grounded by the h€aler control panel.
The recirculation control motor receives battery
voltage through fuso 17 when the ignition swilch is
in ON (ll). lt regulates the position of the fresh/recirc
door, and is controlled by two position inputs from
the heater control panel ("Recirc" and "Fresh").
Refer to the Service Manual (Section 21, Heater) tor
specific tests or troubleshooting procedures.
61-3