1998 HONDA INTEGRA fuel

NOTE: Fuse 31 is HOT with lgnition Switch in START (lll) and clutch pedal depressed or
A'/T Gear Selector in PARK (P) or NEUTRAL (N), see Starting System, pages 21 and 21 -1
--r-----1
i , ruseor i
i seetntesrateo ] ;i.Sf" !
19"1"''iL_:3____..!
".";I,tr tfl13,,
UNDER-DASHFUSE/RELAYBOX
PGM.FIMAINRELAY
aBLU vHr ll2 l' C446
""ln:,
|:::J-'["''t;;;]"'" l"'.'.[r**
HrrF,,
lx"",
""",[:,
w l""""lH*"ril:, E
"TL------- j----La*=
zs L c+sz 6l----------r:I----- ' ::- -.i':Jl c408----:=-1
, ,,ffJ"r ,4t", 'iJi, ,ff3, II itAcrvl (Pcs) FIB) {srs) iac EVAP Fuel Srading valve purge control PumP anput
control solenoid control
, valve control&------r -poile-Rr-Rdi;;e-nc-rN-E c-on-rli6fi68-uriiEil'"-, edr,ri
(cont'd)
24-1

Supplemental Restraint System (SRS)
FUSE 13FUEL PUIIP(SRS UNF)t5a
FUS€ 23(s8s)
ts13t5" To avoid accidental deployment and possible iniury,
lq9Fr. always disconnect the driver's airbag and frontg[f" pas"Lnger's airbag connectors (automaticallyPHorQ 58 shorted) before working near any SRS witing.
CAUTION: Whenever the ignition switch is ON (ll), ol
has been turned OFF tor less than three minutes, be
careful not to bump the SRS unit; the airbags could
accidentally deploy and cause damage or iniuries.
{-
lgnitionrnpul(VA)
tgnitionInpul(VB)
Passenger'sarrbagcontrol
SFIS indicaiorlight control
Service MEScheck @nnectorconnector input GroundInpu
Driver'sarrbagconlr0lDLC'npuvoutput
-ro--Y---la-Y--- 16
:ffi*f:ffq
lJnor,rrpassencen= 'l t- 'i
rHas bu,ll 'n shorl contac0
I j:::T
fn'"o"t. n-n .non "on,""u
" "'Jl
"oou
""" ""]
.!, "oou $
cRN
: :3<::" :l (Y.e_er
oArA LINK sERvrcE 9qe l-qs,'l SABLE coHrecibn aH;a'i- ?9q1i iEEi- 1ot-i1 cijrlt't'ecron n/r contrors
I Pt:OfO 5a pqara t Jt PForo 76
I
STEERINGWHEEL
1
GRY
ON|vER'S AIRBAG(Has built-in short contact)
L---------J
47
GBY
r
I
I
GRY
2
NED

Low Fuel Indicator Light
!
--------Jc551
See PowerDistribution,page 10-5.
See Gauges, I ASSEMBLYIndicators
LOW FUELINDICATORLIGHT
lrnl
FUSE 25ffETEF7,5ASee PowerDistribution,page 10-5.
I
c505
UNOER.DASHFUSE/RELAYBOX
D4
L-3
10
3c51 l
Thermlstor
SeeGaugesL-------
FUELTANKUNIT
1

- How the Circuit Works
Do not smoke while working on the fuel system.
Keep open flame away from the work area. Drain
fuel only into an approved container.
A thermistor is mounted in the fuel tank unit. When
the thermistor is cool, its resistance is very high.
When the thermistor is warm, its resistance
decreases. Fuel in the fuel tank transfers heat away
from the thermislor last enough to keep it cool so
the thermistor's resistance stays high and the low
fuel indicator lighl does not come on. When the fuel
level drops below about 2.2 gallons, the thermistor
is no longer immersed in fuel. Without the fuel to
cool it, the thermistor's resistance decreases,
allowing current to flow through the low fuel
indicator light and the thermistor to ground, and lhe
low fuel indicator light comes on.
Refer to the Service Manual (Section 23, Electrical)
for specific tests or troubleshooting procedures.
74-1

lndicators
UNOER.HOOOFUSE/RELAYBOX
UNDER-DASHFUSE/BELAYBOXJ-rr-.rr1----l
)n*" i
I See Power I
^hiEl'tli10
J;;,;---
J::____3
c55t
S€e PowerDistribution,pag€ 10-5.
c216
c452
WHT/GFN - se€ Power-> Distribution,
WHT/GBN
11(RS 10)
WHT/GRN
page 'l0-9.
c559
\
\
I
I
,
I
I
i--jltffi*, se€causss' *|
i
ffi"fi?ri\l i
i
) #,8:l;"
i,9, nH^,"",9, mis*"
g
ilH4+fi
g
ffi"",$, FF"1t1;;1\
l:r irr-.-.-r !rn lrz: ltlsft IILr==
ilLSl +16l lLel l* +=-,I l- | ll\y/l l-
i | | | lc"""d") |
- - I - -l-L - - - - : J- - - - -aL - - - - 3'J- - - - - 1 I - - - - - Jcsse, +11------z-lf------e-lf-----ro-][-- -ircs60
i
*, -",
I
., o"n ,.o
|
".0 ".u
I
o"n ".o
[
"*
|
it t t I I, See Low Fuel See Door See Seat Belt See Brake See Hatch,ilizet '. lndicator Open Reminder Svstem or Trunk Lid'1
i Lrght Indrcator tndrcator Open Indicator
rrrer - i
80

Gauges
I
I
I
I
10
FUSE 25HElEN7.54
FUSE/RELAYBOX
sse Power I eloro sa
Dishibution,:pags 1&5.----.----Jc551
c559
D8(s 99 D7)
(98-'99 7)8
Seg PowerDistibution,pago l0-5.
ENGIIIE COOI-ANTTEIiPERATUNEGAUGE
I
I
t
\
\
I
,
I---------Jc559
c452PHOTO 61
c127PHOTO 36
c107
c505
c511
YEUGBN
(RS s)
YEL/GBN
10
YEUGRN
Fuel GaugeSendlng UnltFull: 2'5 ohmsEmpty: 10$110 ohms
See LowFuel lndicatorUght
FUELTANKUNITc301
11
YEUCRN
l.'n ENGINEI 1/l COOLANTI .' I TEMPERATUREI 'I I GAUGE SENDING.- UNIT- PHOfA 17PfiOrO r8 (GS B)
81

Gauges (cont'd)
- How the Circuit Works
When the ignition switch is in ON (ll) or START (lll),
battery voltage is supplied through fuse 25 to the
gauges in the gauge assembly.
Speedometer and Odometer
The odometer and speedometer drive circuits
receive pulses lrom the vehicle speed sensor
(VSS). The pulse rate increases as the car
accelerates. The frequency and duration of these
input pulses are measured and displayed by the
speedometer, odometer and tripmeter.
Tachometer ('98-'99 Models)
The tachometer drive circuit receives oulses from
the ignition control module (lCM) in the distributor
assembly. The solid-state tachometer then displays
these pulses as engine speed. For each 200 pulses
per minute from the ignition control module (lCM),
the tachometer displays 100 RPM.
Tachometer ('00 Model)
The tachometer drive circuit receives pulses f rom
the PCM or ECM. The solid-state tachometer then
displays these pulses as engine speed. For each
200 oulses oer minute trom the PCM or ECM the
tachometer displays 1 00 RPM.
Engine Coolant Temperature Gauge and Fuel
Gauge
The engine coolant temperature gauge has two
intersecting coils wound around a permanent
magnet rotor. Voltage applied to the coils, through
fuse 25, generates a magnetic field. The magnetic
field, controlled by the engine coolant temperature
gauge sending unit, causes the rotor to rotate and
the gauge needle to move. As the resistance in the
sending unit varies, current through the gauge coils
changes. The gauge needle moves toward the coil
with the strongest magnetic tield. The fuel gauge
works the same way.
The engine coolant temperature gauge sending
unit's resistance varies from about 137 ohms at low
engine temperature to between 30-46 ohms at high
temperature (radiator fan running).
The fuel gauge sending unit's resistance varies from
about 2-5 ohms at full, to about 110 ohms at empty.
When you turn the ignition switch to LOCK (0), the
gauge remains at the last reading until you turn lhe
ignition switch to ON (ll) or START (lll) again.
Refer to the Service Manual (Section 23, Electrical)
for specific tests or troubleshooting procedures.
81'2

- How the Circuit Works
The immobilizer system is designed to prevent the
car f rom being started without the owner's ignition
key. lf an attempt is made to start the car without
the correct key, the immobilizer system will disable
the car's fuel supply.
The immobilizer system consists of the ignition key,
immobilizer receiver unit, immobilizer indicator
light, PGM-FI main relay, fuel pump, and the PCM
or ECM.
With the ignition switch in ON (ll) or START (lll), the
immobilizer receiver unit and the PCM or ECM
receive an "ignition on" signal through fuse 44 and
the PGM-FI main relay. The PCM or ECM then
sends power to the ignition key transponder through
the immobilizer receiver unit. The transponder then
sends a coded signal back to the PCM or ECM
through the receiver unit. lf the signal is correct, the
PCM or ECM will energize the car's fuel supply
system by grounding the PGM-FI main relay. The
immobilizer indicator light flashes a code to indicate
that the correct key has been inserted. lf the
ignition key signal is not correct, the PCM or ECM
will not energize the car's fuel supply system by not
grounding the PGM-Fl main relay. The immobilizer
indicator light then flashes a code to indicate that an
incorrect key has been inserted.
Refer to the Service Manual (Section 23,
Body Electrical) for specific tests and
troubleshooting procedures.
132-1