Engine head HONDA CIVIC 1996 6.G Service Manual

ECM/PCM CONNECTOR D I16P)
Wire side ot female terminals
ECM/PCM CONNECTOR D l16P)NOTE: Standard battery voltage is 12 V
Te.minalnumb€r
Wirecolor
Terminaln!meDor.riptionSignal
RED/BLKTPS (THROTTLE POSITION
SENSOR}
Detects TP sensor signal.With throttle fully open: about 4.8 V
With throttle fully closedl about 0.5 V
REDA/VHTECT {ENGINE COOLANTTEMPERATURE SENSORDetects ECT sensor signalWith ignition switch ON{ll): about 0.1 - 4 8 v
(depending on engine coolant lempe ratu re)
3RED/G RNMAP {MANIFOLD ABSO'LUTE PRESSURE SENSOR}Detects MAP sensor signal.With ignition switch ON(ll): about 3 V
At idle: about 1.0 V
{depending on engine speed)
YEUREDVCCl (SENSOR VOLTAGE)Power source lor MAP sensor.With ignition switch ON (ll): about 5 v
With ignition switch OFF: 0 V
5GRNMHTBKSW {BRAKE SWITCHIDetects brake switch signalWith brake pedal released: 0 v
With brake pedal depressed: baftery voltage
6*?RED/BLUKS {KNOCK SENSOR}Detects KS signal.With engine knocking: Pulses
1
PHO2S (PRIMARY HEAT-ED OXYGEN SENSOR,SENSOR 1)
Detects Primary heated oxygen
sensor (sensor 1l signal
With throttle fullv opened from idle with
Iully warmod up engine: above 0.6 V
With throttle quickly closed: below 0.4 v
LABELDetects LABEL resistanceWith engine r!nning:about 0.3 - 4.9 V
8RED//ELIAT (INTAKE AIR TEM-PERATURE SENSOR)
Detects IAT sensor signal.With ignition switch ON (ll): about 0 1 -
4.8 V {depending on intake air temperature)
9*lWHT/BLKEGRL iEGR VALVE LIFT
SENSOR)
Detects EGR valve lift sensor signalAt idle without vacuum: about'1 2 V
With 27 kPa (2OO mmHg,8 in. Hg): about 4 3 V
10YEUBLUVCC2 (SENSOR VOLTAGE)Provides sensor voltage,With ignition switch ON(ll): about 5 V
With ignition switch OFF:0 V
11GRN/BLKSG2 (SENSOR GROUND}Sensor ground.Less than 1.0 V at alltimes
12G RN,4/1r'HTSG1 (SENSOR GROUND)Ground for MAP sensor.Less than 1.0 V at alltimes
GRN/BLK*1?SHO25G (SECONDARY
HEATED OXYGEN SEN'
SOR, SENSOR 2 GROUND)
Ground for secondary heated oxy-
gen sensor (sensor 2).
14WHT/REDSH02S (SECONDARY
HEATED OXYGEN SEN'soR, sENsoR 2)
Detects secondary heated oxygen
sensor (sensor 2) signal.With throftle fully opened lrom idle with
fully warmed up engine: above 0.6 V
With throttle quickly closed: below 0.4 V
15|3. *15LT GRNPTANK {FUEL TANK PRES.
SURE SENSOR)
Detects fueltank prgssure sensor'With fuelfill caD opened: about 2.5 V
16*1GRN/RED
EL (ELD)Detects ELD signal.With parking lights turned on at idle: about
2.5 - 3.5 VWith low beam headlights turned on at
idle: about 1.5 - 2.5 V
*1: USA model*2r A/T (D16Y7, D16Y8 engine)*3: CVT (D16Y5 engane)*4: A,/T and Dl6Y7 engine*5: Except A/T and D16Y7 engine*6: A"/T (D16Y8 engine)i7: CVT (Dl6Y5 engine) and Dl6Y8 engine*8: .96 D16Y8 engine (coupei,'97 D16Y8 engine
models, sedanr KL model),'98 016Y5 engine,
engine, '99 - 00 D16Y5 (M/T) engine
*9: D16Y5 engine*10: M/T (D16Y5 engine)*11: Except M/T (Dl6Y5 engine)* 12r D16Y5. D16YB engine*13: D16Y8 engine*14: Dl6W engine*15: '97 D16Y7 engine (coupe: KL model, sedan: KL lLX) model),'98D16Y7 engine:(coupe: all'98 D16Y8
(cont'd)
1 1-91

Troubleshooting
Engine/P_o,wertrain Control Module Terminal Arrangement('99 - 00 Models except Dl6Y5 engine with M/Tl
ECM/PCM CONNECTOR A (32P)Wire side ot temale terminalsNOTE:Standard battery voltage is l2 V
ECM/PCM CONNECTOR A I32PI
Sign!l
3BLU2WSS (EVAP 8YPAsS SOLENOIDDrives EVAP bypass solenoid vatve,With gn'tion swnch ON (lll banery votlage
LT GRN/I/VIITVSV {EVAP CONTNOL CANISTERVENTSHUTVALVE]Drives EVAP controt ca n isrer v€nt shutWilh ignilion switch ON {tl): b€ttery vottage
8LU/GNNC8S (CRUISE CONTSOL SIGOown shift signal inpot lrom c.uise conrrolWhen crurss control is used:purses
68ED/YELPCS {EVAP PURGE CONTROLSOTENOIOVALVE)Drives EVAP purge conrrol sotenoid vatve.With engine running, engine cootant, betow r54.F (6a,C):
With engine.unning, €ngine coolant, abov€ 154.F(68'C): duty conlrolled
YELATPD {AT GEAR POSITIONSWITCH)ootects A/T gear posnion swilch s,gnar.In otherthan @ posilion: Apprcx. 5 V
8BLK,IflHTSO2SHTC (SECONDARY HEATED OXYGEN SENSOS HEATEFCONTFOL)
Drives sscondary h€ared oxygen senso.Wilh isn,rion swirch ON (ll):banery votraseWith lully warm6d dp€ngire runn'ng:dury controled
LT GRNATPNP (AT GEAF POSITIONSWITCH)oereds A/T 9€a r position switch signat.In Parr or neulrsl:0 VIn anyother position approx.5 v
t088NSCS (SERVICE CHECK SIGNAL)Oetects ssruice check connecror signal(the signalcausing a OTC indication)with rh€ t6rminal connected: 0 vWith the rerm ina I disconneded: abour 5 V of ban€ry
GNN/BIKD4IND (D4INDICATON]Drives Oa indicaio. lighr.With D4 indicator lightturned ON: O VWith D4 indicator lightturned OFF: battery vo ttageG8N/YETFTF (FUEL PUI\,4P SELAY)Orivos tuel pump relay,0V for two s€conds lfrer turnrng rgnilior swtcn ON(ll), then batt€ry voltage11BTI(REDACC (Al/C CTUTCH SELAY)Drives A./C clutch reray.With compressor ON:O VWilh comp.ssor OFF; battery vottage18GFN/OFNMI! (A,IAIFUNCTION INDICA.TOF LIGHT)With MlLturned ON:0 VWith l\,llL tornod OFF|batrery votrsge198tuNEP (ENGINE SPEED PUTSEIOulputs6ngine speed pulse,Wilh engin6.unning: putses
20GFNFANC {SADIATOR FAN CONTnoL)Orives radiarortan relay.Wirh r.distor t6n running:OVWith radiatortan stopped: banery vottage21ELUA/ELK LINESends and r€ceives s.an lool signal.With ignition switch ON (ll):p!ts€s
22'lBLUATP L {AT GEAS POSITIONswtTcH)Oelocis A"/T gear posirion switch siSnat.In othfflhan E position: Apprcx. 5 V
23SHO25 (SECONOARY HEATEDOXYCEN SENSOR, SENSOF 2)Detects secondsry hoar€d oxygen sensorWith lhronle f! lly or'6ned from idte with fu ywarmod up engine: above 0.6 vWiih th.onl6 quickb, closd:below 0,4 V24STS ISTAFTEN SWITCH SIGDebcrs staner switch signat.Wirh srarterswitch ON (tttJ: batteryvottogeWith sraftsr cwirch OFF:0 V26GFNPSPSW iPlS PNESSURESWITCII SIGNAL)Derecrs PSP switch signat.Atidle with steoring wheolin srraightahead position: O VAt idl6with steering wheetal fult lock: barery vo ttags27BLU/REOACS (AJC SWITCH SIGNALJOer*ts ,ay'C swirch signat.Wiih ty'C switch ON;0VWilh Ay'C switch OFF|aboor 5VWHT/REDSLU iINTERLOCK CONTROIUNIT)Drivos interloct control unit.With ignltion switch ON (ll)and brake pedaldepresed: batlory volrage29LT GRNPTANK (FUEL TANK PFESSUEESENSOR)Oer6ds lu€l tank pr€ssura sonsor signat.Wilh ig.rrrd swirch ON rttr and fuetti

cap ooen6d.
30GRN/FEOEr (ELOIWith parking lighlsrurned on ar idteiaboui 2.5- 3.S VWirh low beam he€dlig hts turnqd on ai idts: aboul 1.52.5 V32GRN/'WHTAKSW (BFAKE SWITCH)Detets brak€ swrtch signEt,With brake pedal r6l€ased:0 VWhh brake pedaldepres*d: battery voltEse'1:A./T (D16Y7, D16Y8 engine)*2: rvt/T13: CVT (D16Y5 engine)
11-92

Electrical Load Detector (ELDI {'96 - 98 Models,'tn - 00 D16Y5 engine with M/T}
The scan tool indicates Diagnostic Trouble code (DTC) P1297: A low voltage problem in the Electrical Load
Detector (ELD) circuit.
ELD 3P CONNECTOR (c35'rl
l-- ,ll l2l3l--f ..
ao (GRN/REDI
Y
ECM/PCM CONNECTOR O I16PI
Wire side of female terminals
Problem verification:'!. Do the ECM/PCM Reset Pro-
cedure.2. Sta rt the engine
3. Turn on headlightslntermittent tailure, sYstem is OK
at this time. Check for Poor con-
nection3 or loose wires at C131
tlocated under righl side of da3h).
C354 (ELDIand ECM/PCM.
ls DTC P1297 indicated?
Ch.ck lor short in the ELD:
Measure voltage between body
ground and the ELD 3P connector
terminal No.3.
ls there approx.4 5 V?
Check for a short in tho wile (EL
linel:1. Turn the ignition switch OFF'
2. Disconnect the ECM/PCM con
nector D (16P)
3. Check for continuity between
body ground and ECM/PCM
connector terminal D16
R6pair short in the wire between
ECM/PCM (D161and ELD.
Substitute a known-good ECM/
PCM and recheck lf symplom/
indication goes awaY, rePlace
the original ECM/PCM
ra
11-179

PGM-Fl System
Elestrical Load Detector |ELD) t'glf - 00 Models except D16y5 engine with M/Tl
The scan tool indicates Diagnostic Trouble Code (DTC) P'1297; A low voltage probtem in the Electrical LoadDetector (ELD) circuit.
ELD 3P CONNECTOR tC354)
EL{GRN/REOI
ECM/PCM CONNECTOB A I32PI
Wire side of lemale terminals
Problem verilication:1. Do the ECM/PCM Reset Pro-cedure.2. Sta rt the engine.3. Turn on headlights.
Inlermittont failur6. systom i3 OKat this time, Chock tor ooor con-nestions or loose wires at C131(locrted undor ight side ot d.shl,C354 (ELDI and ECM/PCM.
Check for short in th6 ELD:Measure voltage between bodyground and the ELD 3P connectorterminal No.3.
ls there approx. 4.5 V?
Check to. a short in the wne (ELlinel:'L Turn the ignition switch OFF.2. Disconnect the ECM/PCM con-nector A (32P).
3. Check tor continuity betlveenbody ground and ECM/PCMconnector terminal A30.
Repair short in the wile betweenECM/PCM lA30) and ELD.ls there continuity?
Sub3titute a known-good ECM/PCM and rech€ck. It symptom/indication goes away. replacethe o.iginal ECM/PCM.
1 1-180

Elestrical Load Detector (ELD) f96 - 98 Models''99 - 00 D16Y5 engine with M/T)
ThescantoolindicatesDiagnosticTroubleCode(DTC)P1298:AhighvoltageproblemintheElectricalLoad
Detector (ELD) circuit
ELD 3P CONNECTOR {G's'I
Wire side ol female terminals
EL IGFN/REDI
Problom vcrificttion:
1. Do the EcM/PClVl Reset Pro-
cedure,2. Start the engine.
3. Turn on headlights.lntarmitt..rt l.ilur., ryttcm b OK
.t thia tim. Ch.ck lor Poo' con-
nections or looaa wir.3 at C131
lbcd.d und.r right ide ol dalhl'
Gl5a {EU)} .nd ECM/PCIYI
ls DTC P1298 indicated)
Ch.ck lor tn oPan in tho wir'
(lGl linol:1. Turn the ignition and head'
liohts OFF2. D]""onn""t the ELD 3P con_
nector-3. Turn the ignition switch ON {ll)'
4. Measure voltage between body
ground and the ELD 3P connec
tor terminal No. '1.
R.oair ogan in tha wira Mw"n
ru". rs ltTEnrlton SP SelSOn
t?.5 A, fu!. in th. undcr-dr3h
tu3e/r.l!Y box .nd ELD.
Chcck lor tn oP.h in thc wire
{GND lincl:1. Turn the ignition switch and
headlights OFF.
2. Disconnect the ELD 3P con_
nector'3. Check for continuity between
body ground and the ELD 3P
connecto. terminal No 2
Raprir opcn in the wira bstwt€n
ELD conncctor lnd G/O2.
Ch.ck lor !n oplo in tha wirc IEL
lin.l:Check for continuity between the
ELD 3P connector terminal No 3
and ECM/PCM connector termi
nal D'16.
Rapaii opcn in the wira b€tw"n
ECM/FCM (I)161 .nd th. ELD'
Ch.d( fo. r m.llunction in thc ELD:
1. Reconnect the ELD 3P con'
2. Start th€ engine and allow it
to idle.3. Wh ile measuring voltage
beNveen ECM/PCM connector
terminals D16 and A9, turn
the headlights on {low).
Does the voltage droP?
Sub3titut. . known_good ECM/
PCM .nd rcch.ct. lt sYmptom/
indication goas away/ iapllc'
thc origin.l ECM/PCM
wire side of lemale termrnals
Wire side of Iemale terminals
t'a
)
1 1-181

PGM-FI System
Elestrical Load Detector (ELDI ('99 - 00 Models except D16y5 engine with M/Tl
The scan tool indicates Diagnostic Trouble code (DTCI Pl298: A high vottage problem in the Etectrical LoadDetector (ELD) circuit.
ELD 3P CONNECTOR (65/0
EL {GRN/REOI
Wire side of fernale terminals
ELD 3P CONNECTOR (CA54I
TIr l2l3l
I crvo
(o) (BrKr
Y
Wire side of lemale terminals
ECM/PCM CONNECTORSA (32P1
Wire side of lemaleEI- IGRN/RED)terminals
ECM/PCM CONNECTORS
A {32P)
Problem ve.itication:1. Do the ECN4/PCM Reset pro
cedure.2. Start the engine.3- Turn on headiights.Inte.mittent teilu.e, svstem is OKat this lime. Chock for Door con-nections or loose wires at Ci31{located under Jight side otdaihl, C354 (ELD) and ECM/PCM.
ls DTC P1298 indicated?
Check for an open in the wire{lG1 line}:1. Turn the ignition and head-lights OFF.2. Disconnect the ELD 3P con
3. Turn the ignition switch ON (ll).4. Measure voltage between bodyground and the ELD 3P connec-torterminalNo. 1.
Repair opon in tho wiro batwe€nNo. 15 ALTERNATOR Sp SENSOR{7.5 A} fuse in th6 undor-dashIuse/reley box and ELD.
ls there battery voltage?
Check for an open in the wiro{GND linel:1. Turn the ignition switch andheadlights OFF.2. Disconnect the ELD 3P connector.3. Check for continuity betweenbody ground and the ELD 3Pconnector terminal No. 2,
Repair open in the wire bstwoenELD connsctor and Gia02.
Check ,or an open in the wire IELlinel:1. Disconnect the ECM/PCM con-nector A (32P).2. Check for continuity betweenthe ELD 3P connector terminalNo. 3 and ECM/PCM connec-tor terminal A30.
Chock fo. a malfunction in the ELD:'1. Reconnect the ELD connectorand ECM/PCM connectorA (32P).
2. Stan the engine and allow itto idle.3. While measuring voltagebetween ECM/PCM connectorterminals A30 and B2O, turnthe headlighrs on ow).
ls there continuity?
Repsir op€n in the wire betweenELD connector and ECM/PCM.
Substitute a known-good ECM/PCM and recheck. lf symptom/indication goes away. replacelh6 original ECM/PCM.
Does the vokage drop?
Wire side of f€male terminals
11-182

ldle Control System
ldle ControlSystem
lF0505 l Th" """n tool indicates Diagnostic Trouble Code (DTC) PO5O5: tdte controt system malfunction.
NOTE: lf DTC P1508 or P1509 is stored at the same time as DTC P0505, troubleshoot DTC p1508 or p1bog first. thenrecheck for DTC P0505.
Possible Cause
. IAC valve mechanical malfunction
. Throttle body clogged pon, improper adjustment. Intake manifold gasket leakage
. Intake air hose loose leakage
. Vacu um leak
. ECT sensor incorrect output
. Throttle Position sensor incorrect output*r
Troubleshooting Flowchart
The MIL has been reoorted on.DTC P0505 is stored.
Problem verification:1. Start the engine. Hold theeng;ne at 3,000 rpm with noload (jn Park or neutral) untilthe radiator fan comes on, then*r let it idle.t2. with rhe scan toot, ct'eit Ge l
Throttle position should beapprox. 10% with the throttle fully closed.E ngine coolant tempera-ture should be 194 205'F(90 96.Ci.lf they are not within thespec., repair the faulty sen
L._ _9oI9[cr]41 l3. Chec& the engine speed atidle with no-load cond;tionsiheadlights, blower fan, reardefogger, radiator fan, and airconditioner are not operating\see page l1-22O - 223).
Intermittent tailure, system is OKat this time.ls the idle speed OK?
ls it 550 rpm or less?
(To page 11,193)
*1r'96 models only
11-192
(To page ll-193)

ldle Control System
Alternator (ALTI FR Signal {'96 - 98 Models,'99 - 00 Dl6y5 engine with M/Tl
ECM/PCM CONNECTORS
a {32P)
LGl(BRN/BLK)
Wire side of female terminals
ALT CONNECTORS IC1O4I
JUMPER
JUMPER WIRE
WIRE
Wire side of female terminals
ALT F{WHT/REO)
This signals the ECM/PCM when the Alternator (ALT) is charging.
Inspoction of ALT FR Signal.
Check tor a short in tfte wire (ALTF linel:1. oisconnect the 4P (3P)* con-nector from the ALT.2. Turn the ignition switch ON (ll).3. M easu re voltage betweenECM/PCM connector terminals C17 and A9.Check lor a sho.t in the wire {ALTF line):r. I urn rne tgn|lton swtlch ul-f,2. Disconnect the negative bat-tery cable from the baftery.3. Disconnect the ECM/PCM connector C {31P).4. Check for continuity betweenbody ground and ECM/PCMconnector terminal C17.
ls there approx. 5 V?
Check th€ operation of the ALT:1. Turn the ignition switch OFF.2. Reconnect the ALT 4P (3P)*connector to the ALT.3. Start the engine. Hold theengine at 3,000 rpm with noload (in Park or neutral) untjlthe radiator fan comes on, thenlet it idle.4. [,4easu re voltage betweenECM/PCM connector terminalsC17 and A9.
Repair short in the wire betwe€nthe ECM/PCM {Cl71and th€ ALT.
Substitute a known-good ECM/PCM and recheck. It prescribedvoltage is now available, roplacethe originrl ECM/PCM.
Does the voltage decrease whenheadlights and rear defogger areturned on?ALT FR signal is OK.
Check tor an open in the wire (AlTF linel:1. Turn the ignition switch OFF.2. Disconnect the negative bat-tery cable from the battery.3. Disco n nect the ECM/PCMconnector C (31P).4. Disconnect the 4P (3P)* con,nector from the ALT.5. Connect the ALT 4P 13P)l connector terminal No. 4 (No. 1)'to body ground with a iumper
6. Check lor continuity betweenbody ground and ECM/PCMconnector terminal C17,
Repair op6n wire botween th€ECM/PCM (C171rnd th€ ALT.ls there continuity?
c {31P)
1178I10
1112131415161718
232125a30
oALT F IWHT/REDI
4P3P*
1 2l
Flr
rr-ri-frwHr/ (V)
neor Y
*: Canada model
11-208
3I78910
1l1213l415161718/l
232125E30
oALT F IWHT/REDI

tAlternator (ALT) FR Signal ('99 - 00 Models except Dl6Y5 engine with M/T)
This signals the ECM/PCM when the Alternator {ALT) is chargingECM/PCM CONNECTORS
Wire side of female terminals
ECM/PCM CONNECTOR C (31P}
lt
lP
ALT CONNECTORS IClO4I
JUMPER
JUMpER WlnE
WIRE
Wire side of female termlnals
ECM/PCM CONNECTOR C (31PI
3P*NO
Check lor an op€n in the wire (ALT
F line,:1. Turn the agnition switch OFF
2. Disconnect the negative bat-
tery cable {rom the battery.
3. Disconnect the ECM/PCM con'
nector C (31P).
4. Disconnect the 4P (3P)* con'
nector from the ALT.
5. Connect the ALT 4P (3P)* con-
nector terminal No 4 (No. 1)*
to bodY ground with a iumper
6. Check lor continuity between
body ground and ECM/PCM
connector terminal C5
--?--1l2l|#i3l.l
otriJrwxrr (V)
neor Y
lnsoeclion oI ALT FB Signal.
Check {or a short in the wire {ALT
F line):1. Disconnect the 4P (3P)+ con
nector from the ALT
2. Turn the ignition switch ON (ll)
3. Measurc voltage between EcM/
PCM connector terminals C5
and 820.Check tor a short in the wirc (ALt
F line):1. Turn the ignition switch OFF
2. Disconnect the negative bat_
tery cable from the baRery'
3. Disconnect the ECM/PCM con'
nector C (31P).
4. Check for continuity between
body ground and ECM/PCM
connector terminal C5
ls there aPProx. 5 V?
Check the operation otthe ALT:
1. Turn the ignition switch OFF.
2- Reconnect the ALT 4P (3P)*
connector to the ALT
3. Start the engine. Hold the
engine at 3,000 rpm wrth no
load {in Park or neutrali until
the radiator fan comes on,
then let it idle.
4- Measure voltage between ECM/
PCM connector terminals C5
and 820.
Repair short in the wire between
the EcM/PCM {C5l and the ALT.
Substitute a known-good ECM/
PCM and rechock. lf P.esc.ibedvoltage is now availabl€, ieplace
tho original ECM/PCM
Does the voltage decrease when
headlights and rear delogger are
turned on?
ALT FF signal is OK.
Repair oPen wire betwoen t|lo
ECM,/PCM {C5) and the ALT.
ALT F (WHT/RED)
Wire side of temale terminals
*: Canada model
Wire side of female termrnals

ldle Control System
ldle Speed Setting
Inspection/Adiustmenl
'96, '97 Dl6Y5. '96 - 00 Dl5Y8 sngine with M/T
NOTE:
. Before setting the idle speed, check the following
items:- The MIL has not been reported on.- lgnition timing- Spark plugs- Air cleaner- PCV system
o (Canada) Pull the parking brake lever up. Start the
engine, then check that the headlights are off.
1. Start the engine. Hold the engine at 3.000 rpm withno load (taansmission in neutral) until the radiatorfan comes on, then let it idle.
2. Connect a tachometer.
3. Disconnect the IAC valve connector.
4.lf the engine stalls, restart the engine with the accel-
erator pedal slightly depressed. Stabilize the rpm at1,000, then slowly release the pedal until the engineidles.
Check idling in no-load conditionsr headlights. blowerfan. rear defogger, radiator fan, and air conditioner
are not operating.
ldle spsed should be:
450 1 50 rpm
11-220
Adjust the idle speed, if necessary, by removing thecap and turning the idle adjusting screw.
NOTE; After adjusting the idle speed in this step,recheck the ignition timing (see section 23).
lf it is out of spec, go back to step 4.
IDLE
6. Turn the ignition switch OFF.
7. Reconnect the 2P connector on the IAC valve, then
do the ECM reset procedure.
8. Restart and idle the engine with no-load conditionsfor one minute, then check the idle speed.
NOTE: (Canada) Pull the parking brake lever up.Start the engine, then check that the headlights areoff.
ldle sp€sd should b€:
670 i 50 rpm IUSA)750 t 50 rpm {Canada}
9. ldle the engine tor one minute with headlights {Low)ON. and check the idle speed.
ldle speed should be:
750 :r 50 rpm
10. Turn the headlights off. ldle the engine for oneminute with heater fan switch at Hl and air conditioneron, then check the idle speed.
ldle speed should be:
810150 rpm
NOTE: lf the idle speed is not within specification,see Symptom Chan on page 11-84.