1998 ACURA INTEGRA check engine

Charging System
Troubleshooting
It the charging system light does not come on or does not go off, or the battery is dead or low, test the following items in
the order listed below:
1. Battery
2. Charging system light
3. Voltage
4. Alternator control system
5. Alternator/regulator
Charging System Light Test
ALTERNATOR'P CONNECTORIUSAI
IGIBLK/YEL)
Wire side offemale terminals
Wire side offemale terminals
ALTERNATOR 3PCONNECTOR lCanadal
Charging System Light Check:Make sure the charging systemlight comes on.
Ch€ck tor a blown No. 15 (7.5 A)
tuse and . blown charging sys-
tem light bulb. ll the fuse andbulb are OK, .eptir tho open inlhe WHT/BLU or BLK/YEL wire.
Does the charging systemlight come on?
Ch.rging System Light Check(cont'd):
Start the engine.
Pertorm the Ahernator/RegulstolTest (s€. prge 23-101,Does the charging systemlight go off?
Voltago Check:Measure the voltage at the No. 1
lNo. 2l terminal of the 4P [3P]connector with tho ignition switchoN {lr).
Repair tho open in ih€ 8LK/YELwir6 betweon the alte]nator andundor-dash lure/reley box.
I4
L-*
23-102

Gharging System
Troubleshooting
Ahcrn.tor Control Swtom T.rt (USA)
NOTE: Betore testing, check proper operation of the ELD by confirming with the MIL (s€e section 11).
CAUTION: Ba 3urc to ut! | vollmatalwith hr plu! tarmlnal connactad to bat-tary plua and ita mlnua talmlnal to lha4P connactor tarrninal No. 2.
ALTENNATORilP COiINECTOR
cIWHT/GBN}
ALTERNATOR.P CONI{ECTOB
Wire sido olt€m6le t€rminal6
ECM CONI{ECTOR A l:t2F)
BATTERY
Ch.ck tor . .hort In th. clrcuit(ALTC ltn.lr1. Disconnect the 4P connoctorIrom th6 altemator.2. Start tho engine, and turn thoh6adlights (high beam) ON.3. Moasur€ voltago botwoen th64P conn€ctor t6rminal No. 2and the positivo t€rminsl oltho batterv.
16 thor6 1 V or less?
Chrck for .n oD.n In th. wllrIALTC lln.):1. turn the headlight and igni-tion switch OFF.2. Disconnect th6 A (32P) con-noctor from the ECM.3. Ch6ck for continuity b6tw6entho ECM connoctor A (32P)
t€rminal No, 19 and alternator4P connoctor torminal No. 2.
Rrp.h op.n In th. wh. brlw..nth. rltarn oi.nd ECM.
Ch.ct for rhort in th. wire (ALTC
lin.l:'1. Turn the headlight and ignition switch OFF.2. Disconn€ct the A {32P} con-n6ctor from tho ECM.3. Check for conlinuity b€twoenths ECM connector A (32P)
terminal No. 19 8nd bodyground.
Slbrlltut. ! tnown-good ECM..nd rach.ck. It Drorcrlb.d volt-rgr ir now avalldla, raphce lhaorigin.l Ecilt.
Rap.ir 3hort in lha wira bstwaanth. .h.rnator ard ECI\|.
I23{5GtI|l0tl
72151aItIt136zla2a
a26n,/,V
Wir€ side offem6le t€rminals(l
ALTC(wl{T/GRNI
cIWHT/GBNI
Wire 3id€ offemal6 t€rminelg34
ECM CONNECTON A I32P}
t23a50t9t0tt
12t510l1Itt9mz2a2a
62621
ALTCIWHT/GRNI()
23-104
b-.

From previol.rs page
The charging swtem is OK.lsthe amperage 70 A or more?
Alternator/Regulator Test-4:With the engine speed still at2,000 rpm, Iull-Iield the alternator.
Charging System
Troubleshooting (cont'dl
CAUTION: Th6 voltago will rise quickly when the ahernator is ful!fieldcd. Do not .llowth6 voltag€ to €xc6ed 18 V; it may damage tho ol6drical system.
NOTE: Attach a probe to the VAT'40 full field test lead, and insert the probe into the lullfield access hole at the back of the alternator. Switch the field selector to the "A {Ground}"position momentarily, and check the amperage reading.
REGULATOB(Located inside
FULL FIELOACCESS HOLE
END COVEB
END COVER
FULL FIELDACCESS HOLE
L^
23-106

)
t
J
Altelnator ttelr Inspecuon ano Aol
Detlection Method:
Apply a force ol 98 N (1 0 ksl, 22 lbl) and measure the
deflection between the alternator and the crankshaft
DUllev,
Defloction: 9- 11 mm (O.35-O.43 inl
NOTE: On a brand-new belt (one that has been run
for less than five minutes), the deflection should be
81881, Bl8Cl engine: 6 - 8 mm (0.23 - 0.32 inl,
818C5 engine: 7 - I mm (0.28 - 0.35 in) when first
measured, lf the belt is worn or damaged, replace it.
ALTERNATOR ADJUSTING NUT
24 N.m 12,4 kgl.m, 17 lbI'ftl
MOUNTINGNUT44 N.m (4.5 kgf.m,33 tbf.ft)
CRANKSHAFT PULLEY ALTERNATOR BELT
lf adiustment is necessary:
1. Loosen the alternator adjusting nut and mounting
nut.
2.
3.
Move the alternator to obtain the proper belt tension,
then retighten the adiusting nut and mounting nut
to the specified torques.
Recheck the dellection of the belt.
NOTE: lI necessary, adjust the P/S pump belt (see
section 17) and A/C compressor belt (see section
221.
Belt Tension Gauge Method:
Following the gauge manulacturer's instructions, attach
the belt tension gauge to the belt and measure the
tension.
Tension: 340-490 N {35-50 kgf,77-11O lbf)
NOTE: On a brand-new belt (one that has been run
for less than five minutes), tension should be
818B1, 818C1 engine: 690 - 880 N (70 - 90 kgf, 154 -
198 lbf), 818C5 engine: 540 - 740 N (55 - 75 kgf,
121 - 165 lbf) when first measured. lf the belt is
worn or damaged, replace it.
lf adiustment is necessary:
1. Loosen the alternator adjusting nut and mounting
nut.
2.
3.
Move the alternator to obtain the proper belt tension,
then retighten the adjusting nut and mounting nut
to the specified torques.
Recheck the tension ot the belt.
NOTE: It necessary, adjust the P/S pump belt (see
section 17) and A/C compressor belt (see section
22t.
ALTERNATOR ADJUSTING NUT24 N.m 12.4 kgf'm, 17 lbt.ftJ
BELT TENSION GAUGEoTJGG -0010r0A
23-115
J
,-

)
Fan Motor Test
Disconnect the 2P connector from the fan motor.
Test the motor by connecting battery power to the
B terminal, and ground to the A termlnal.
lf the fan motor fails to run smoothly, replace it.
NOTE: The illustration shows the radiator fan.
Radiator Fan Switch Test
NOTE: Bleed air from the cooling system after installing
the radiator fan switch (see section 10)
1. Remove the radiator fan switch from the thermostat
housing.
2. Suspend the radiator fan switch in a container ol
coolanl as shown.
Heat the coolant and check engine coolant tempera
ture with a thermometer.
Check the continuity between the A and B terminals
according to the table:
23-119
Te rm Inal
Operatlon -------\
Tcmoerature ------
ON196. -203'F
(91" 95'C)
-5" 14.F i3" _8"C) ;*,*
than the temperature when
rt goes on.
SWITCH
OFF
B
-o
.-

Vehicle Speed Sensor (VSSI
Troubleshooting
{To next page)
REO TEST HARNESS
PBOTECTIVETAPE
Test tho 8LK wiro:1. Disconnect the 3P connectorfrom the vohicle speed sensor(vss).
2. Connect the test harness(07LA,J - PT3020A) only to theengine wire harnoss.3, Connect the RED test harnessclip to the positive probe of anohmmel€r.4. Check for continuity betwoenthe RED test harness clip andbody ground.
Roplir op.n in th. BLK wirob.tw..n tha VSS .nd G101.
To3t thc BLK/YEL wiro:1. Conn6ct th€ WHT test harnessclip to the positive prob€ of avoltmeter, and connect the REDt€st harness clip to the nogativeprobe.2. Turn the ignition switch ON (lll.
R.p.lr op.n In tho BLK/YEL wirebrtw..n th. VSS and th. under-dr.h tu../r.l!y box.
Tort th. BLU/WHT wiro:Connect the GRN test harnessclip to the positive prob€ ot avoltmeter, and connect the REDtest harness clip to the nggatjveprobe.
Roprh op.n in th. 8LU/WHT wireb.tw.on tho VSS lnd PCM.ls there about 5 V or more?
Before testing, inspect the No. 15 (7,5 A) fuse in the under-dash fuse/relay box.
GRN TESTCLIP
TEST HARNESSOTLAJ - PT3O2OA
w'{T TES? HARIVESS CLIP
TAPE
23-128

1. Disconnect the 3P connector from the vehicle speed
sensor (VSSl.
2. Remove the two mounting bolts, then remove the
VSS.
3P CONNECTOR
BOLT9.8 N.m(1.O kgf.m,22 tbt,ltl
DRIVE LINK
3.Install in the reverse order of removal.
NOTE: The VSS drive link is a very small part;
careful not to lose it.
DC
Vehicle Speed Sensor (VSS)
Engine Oil Pressure
lndicator System
ReplacementEngine Oil Pressure Switch Test
23-130
E-_
1 . Remove the YEL/RED wire trom the engine oil pres-
sure swlrcn.
ENGINE OIL PBESSURE SWITCH
Check for continuity between the positive terminal
and the engine (ground) with the ignition switch OFF.
a lf there is continuity, go to step 3.
a lf there is no continuity, replace the switch.
Check lor continuity again, this time with the engine
running.
a lf there is continuity, go to step 4.
a lf there is no continuity, the switch is OK.
Make sure engine oil level is OK, then check engine
oil pressure (see section 8).
a lf engine oil pressure is OK, replace the switch.
a lf engine oil pressure is low, check the engine oil
pump (see section 8) and, iI necessary, replace it.
2.
3.
POSITIVE TERMINAL

Engine Coolant Temperature (ECT) Gauge
Gauge Test
NOTE: Refer to page 23-123 for the wiring description of
the engine coolant temperature (ECT) gauge circuit dia-
gram.
1. Check the No. 25 (7.5 A) fuse in the under-dash
fuse/relay box before testing.
2. Make sure the ignition switch is OFF, then discon-
nect the YEL/GRN wire trom the ECT gauge send-
ing unit and ground it with a jumper wire.
YEL/GRN WIRESENDING UNIT
Turn the ignition switch ON (ll).
Check that the pointer of the ECT gauge starts mov-
ing toward the "H" mark.
CAUTION: Turn the ignition switch OFF before the
pointer reaches "H" on the gauge dial. Failure to do
so may damage the gauge.
a lf the pointer of the gauge does not move at all,
check lor an open in the YEL or YEL/GRN wire.
lf the wires are OK, replace the ECT gauge.
a lf the ECT gauge works, test the ECT sending
unrt.
ECT Sending Unit Test
Disconnect the YEL/GRN wire from the ECT send-
ing unit.
With the engine cold, use an ohmmeter to measure
resistance between the positive terminal and the en-
gine (ground).
Check the temperature ol the coolant.
Run the engine and measure the change in resistance
with the engine at operating temperature (the radi-
ator fan comes on).
5. It the obtained readings are substantially different
from the sDecifications above, replace the ECT send-
Ing unrt.
POSITIVE TERMINAL
Temperature133oF (56oC)1850F (85.C)-
212.F (100'C)
Resistance {O)13746-30
23-134