engine fan HONDA CIVIC 1999 6.G User Guide

Troubleshooting
E n gine/P_o,weft ra in Control Module Term inal Arra n gement('96 - 98 Models, '99 - 00 Dl6yS engine with M/T)
-
ECM/PCM CONNECTOR A I32PI
1INJ62INJ3INJ21
INJl567I
LG110PGll1
IGPl12
ACV
131115
PCS
16
FLR17acc18MIL19ALTC20
tcM22PG221IGP2272A25
VSV30
SLU
ECM/PCM CONNECTOR A (32P)
'2: A./T (D16Y7, 016Y8 engine)13: CvT (D16Y5 enoin€)',4: A/T and D16y7 engine*5: Except A/T and D16Y7 €nsine'6r A/T (D16Y8 ensine)'7 Cw 1D16Y5 eng,nel and D16y8 ensrne'"'3:Bi..I?'Jt;".'e'.!ti.?i?l'""."T8"_";btfr
"fl
1-88
Wire side of female terminals
NOTE:Standard battery voltage12ts
'10i i,4/T (D16V5 engine)r11 Ex.ept M/l (D16V5 enqinelr12: 016Y5, D16YB enqine
r15:'97 016Y7 engine lcoupe: KL modet, sedan: KL (LXl modet),'98 D16Y7 engine
1
1
Sign.l
YELlNJ4 (No.4 FUEL INJECIOB)D ves No 4 ruel injector.Wilh engine runninq: ddly coniroted2BLUlNJ3 lNo. 3 FUEL TNJECTOBJDrives No. 3 lue Inteclor.38EDINJ2 (NO, 2 FUEI INJECTON)Drives No. 2 iuel njector.88NlNJl (No. 1 FUEL INJECTOB)Dives No. 1 ruelinjector.
5SO2SIITC (SECONDAFY HEATEDOXYGEN SENSOF HEATEF CONTFOL)
Orives secondary heated oxyqen sensorWith ignilion switch ON (lll: batery vo lageWith f!llywarmed up engine runninq:dLtv controled
6BLXAVHTPO2SHTC (PRIMAFY HEATEOOXYGEN SENSOR HEATERCONTROL)
Drives prihary healed oxygen sensorWith ignition switch ON ltt):baneryvottasewlhrdllywdrmedupcngne,Lnnrrq dury,orl.otred
FED{ESOL (EGF CONTRO!SOIENOIO VALVE)Drives EGF conlrolsoleno d vatve.Wilh EGR operating during drving wiih fu|y warmedup engrne: duty controttedWilh EGF nol opefating:O VE.EGRWith EGF operating du.ing driv og wilh iuty warmedup en9ine: dutycont.olted.With EGR not ooeralino; o V8*r/GFN/YELWS (VTEC SOLENOTD VALVE)Drives VTEC solenoid va veWilh eng ne at ow engine speed:O VWirh engine at h gh enqine speedr banery vohaae9BflN/BLKLG1 (LOGIC GROUND)Gro!nd lorthe €CM/PCM conlrotc rcuit.Lesslhan 1.0 V at a ttimest0ALKPG1 IPOWEF GFOUND)Ground ior rhe ECM/PCM power.tcuf.11YEVBLKIGPT iPOWEF SOUFCE)Power source forthe Ec[,l/PcM conlroWilh ignition swirch ON (tt): battery voltageWith gntron switch OFF: 0 VBLVBLUIACV (IDLE AIN CONTROL VALVE)Wilh engine r!nn ng: dlty contro ed13,.o8NIACV N lIDLE AI8 CONTFOLVALVE NEGATIVE SIOE)Drivesthe IAC valve {negalive side).
BLVBLUIACV P (IDLE AI8 CQNTROLVALVE POSITIVE SIDE)Orives IAC vaive (posilive side).
FEO/YELPCS (EVAP PURGE CONTFOTSOIENOIOVALVE)Drives EVAP pu.ge controtsolenoid vatve.Wilh engioe running, engin€ cootani betow 154,F'68'Cr bancry vohaSe w'ln ens nc runn,.o. eng,rc
GRN/YELFL8 (FUEL PU[4P FELAY)Orives fuelpump relay.0 V {or two secor os ahe' tJ n ng 'onir or \wnch ON ,,,,,
I7BLI(REOACC (A,/C CLUTCH RELAY)Drives A/C clutch relay.Wirh compressor ONr0 VWilh compressof OFF:banery votrage18GFN/ONNMIL (I\,lALFUNCTION INDICATOFWith MIL lLrned ON: 0 VWith illl turned OFF: banery volaqe19',AITC {AITERNAIOR CONIROL)se.ds ahernator controt signat.Wirh fully warmed.up engine ru.ntng: battery votlas€During drivins wnh smatl eteclricat toad: O V
20YEVGRNICM (IGNI'TION CONTROLMOOU!E)with ignltlon swilch ON (tl):b6n€ry vohageWilh ensine runnins: aboul t0 V (depending on
22BRN/BLKLG2 (LOGIC GAOUND)Ground for the ECM,/PCM conrrot ci'cu LLess than 1.0 V at a tt mes23BLKPG2 iPOWEA GROUND)Gro!nd lor the ECM/PCM power circuir.24YEUBLKlGP2 (POW€R SOUSCE)Power sou.ce lor the ECM/PCl, conrrolWnh ignilion swilch ON {it):battery vohageWilh ignilion switch OFF:0 V25*6WHT/FEDVSEF IREFEfl ENCE VOLTAGE)Provrdes reference voIaOe to TCM.With ignition switch ON (tt):abour 5 VWth gnition swltch OFF: O V21'1GFNFANC {RAOIATOR FANCONTFOL)Drives radialof fan ielay.With radialor fan f!nn nqr O VWilh radiato.tan stopped: batteryBL!2WBS (EVAP BYPASSSOLENOIO VALVE]Orives EVAP bypass sotenotd va !e.With ignirion swrrch ON (tt):barery vo rase
LT GRNA/VHTVSV (EVAP CONTFOTCANISTEFVENT SHUT VAIVE)Drives EVAP conlfot canisrer venl shulwnh ignirion sw'tch ON lr|l barery volaqe
WHT/NEDSLU (INTEFLOCK CONTFOLUNIT)Detects intenock conlrotLn t signalWhh ignition switch ON (tt)and brake pedadepf essed: battery vollage

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

How to Read Flowcharts
A flowchart is designed to be used from start to final repair. lt's like a map showing you the shortest distance. But beware:
lf you go off the "map" anywhere but a "stop" symbol, you can easily get lost.
tSrARTl(bold type)
FanoNl
@
tsroP I
{bold type)
Describes the conditions or situation to start a troubleshooting flowchart.
Asks you to do something; perform a test, set up a condition etc.
Asks you about the result of an action, then sends you in the appropriate troubleshooting direction.
The end of a series of actions and decisions. describes a final repair action and sometimes directs you to
an earlier part of the flowchart to confirm your repair,
NOTE:
. The term "lntermittent Failure" is used in these charts, lt simply means a system may have had a failure. but it checks
out OK at this time. lf the Malfunction Indicator Lamp (MlL) on the dash does not come on, check for poor connections
or loose wires at all connectors related to the circuit that you are troubleshooting (see illustration below)'
. Most of the troubleshooting flowcharts have you reset the Engine Control Moduls (ECM)/Powertrain Control Module
(pCM) and try to duplicate the Diagnostic Trouble Code (DTC). lf the problem is intermittent and you can't duplicate the
code, do not continue though the flowchart. To do so will only result in confusion and, possibly, a needlessly replaced
ECM/PCM.
. ,,Open" and "Short" are common electrical terms. An open is a break in a wire or at a connection. A short is an acci-
dental connection of a wire to ground or to another wire. In simple electronics, this usually means something won't
work at all. In complex electronics (like ECM's/PCM'sl. this can sometim€s mean something works, but not the way it's
suDDosed to.
toosE
1 1-103

PGM-FI System
System Description
CKP/TDC/CYP Sensor
MAP Sensor
IAT SensorTP SensorEGR Valve Lift Sensor*'Primary H02SSecondary HO2SVSSBARO SensorELD*'KS€Starter SignalALT FR SignalAir Conditioning SignalA/T Gear Position SignalBattery Voltage {lGN.1}Erake Switch SignalPSP Switch SignalFuel Tank Pressure Sensor*iVTEC Pressure Switch*5Clutch Switch Signal*6Countershaft Speed SensornBMainshaft Speed Sensorrs
-\
----t /
F;ilrr j"-----fi-tri-'r.;l
Fb"t."'i" d" c;;il
F,h"'c;;tr*".io";-l
@."r.l"sc;;ll
EaM/PcM B""k-p F"""till
r\
-:/
Fuel IniectorsPGM-Fl Main Belay {Fuel Pump)MILIAC Valve!y'C Compressor Clutch RelayRadiator Fan Relay*,Condenser Fan RelayALT*'lcMEVAP Purge Control Solenoid
Primary HO2S HeaterSecondary H02S HeaterEGR Control Solenoid Valve*rEGR valve*6EVAP Bypass Solenoid Valve*'EVAP Control Canister Vent Shut
VTEC Solenoid Valve*5DLCLock-up Control Solenoid Valve*aShift Control Solenoid Valve*3Linear Solenoid Valve*3
*1: Dl6Y5 engine*2: USA model*3: CW (D16Y5 ensine), D16Y8 engine and 81642 ensine*4: '96 D16Y8 engine lcoupe),'97 Dl6Y7 engine (coupe: KL model, sedan: KL (LX) model),'97 D16Y8 engine {coupe: all models, sedan: KLmodel),'98-all models,'99'all models,'00-all models+5: D16Y5, D16Y8,816A2 engine*6: M/T (D16Y5 enginei*7: CVT 1D'l6Y5 engine)+8: A/T (D16Y7, D16Y8 engine)*9: '96 D16Y5 engine,'96 D16Y7 engine,'96 Dl6Y8 engine (sedan),'97 D16Y5 engine,'97 Dl6Y7 engine (coupe: KA, KC models, sedan:KA, KC, KL (LX) models, hatchback: all models),'97 D16Y8 engine (sedan: KA, KC modelsi
PGM-FI Sy3lem
The PGM-Fl system on this model is a sequential multipon fuel injection system.
Fuel iniector Timing and Duration
The ECM/PCM contains memories for the basic discharge durations at various engine speeds and manifold air flow rates.
The basic discharge duration, after being read out from the memory. is further modified by signals sent from various sen-
sors to obtain the final discharge duration.
ldle Air Control
ldle Air Control Valve llAC Valve)
When the engine is cold. the A,/C compressor is on, the transmission is in gear, the brake pedal is depressed, the P/S load
is high, or the alternator is charging, the ECM/PCM controls current to the IAC Valve to maintain the correct idle speed.
lgnition Timing Control
. The ECM/PCM contains memories for basic ignition timing at various engine speeds and manifold air flow rates.
lgnition timing is also adjusted for engine coolant temperature.
. Aknockcontrol system was adopted which sets the ideal ignition timing for the octane rating ofthegasoline used.*3
Othgr Control Funqtions
1. Starting Control
When the engine is started, the ECM/PCM provides a rich mixture by increasing fuel injector duration.
2. Fuel Pump Control
. When the ignition switch is initially turned on, the ECM/PCM supplies ground to the PGM-Fl main relay that sup-plies current to the fuel pump for two seconds to pressurize the fuel system.. When the engine is running, the ECI\4PCM supplies ground to the PGM-FI majn relay that supplies current to the fuel
oumo.
. When the engine is not running and the ignition is on, the ECM/PCM cuts ground to the PGM-FI main relay which
cuts current to the fuel pump.
11-104
INPUTS
ENGINE CONTROL MODULE (ECMY
POWERTRAIN CONTROL MODULE (PCM) OUTPUTS

PGM-FI System
(From page 11-115i{From page 11-115)
Chock to. poor response:1. Start the engine. Hold theengine at 3,000 rpm with M inE or E position, M/T in neutral untilthe radiator tan comeson, then turn the ignitionswitch OFF.2. Start the engine.3. Check the MAP with the scantool.
ls a N4AP ot 40.0 kPa {300 mmHg,12.0 in.Hg) or less indicated withinone second after staning theengine?
The MAP sensor is OK st this time.
Check lor poor response:1. Start the engine. Hold theengine at 3,000 rpm with M inE or E position, M/T in neu-tral until the radiator fan comeson, then turn the ignitionswitch OFF.2. Start the engine.3. Check the MAP with the scantool.
ls a MAP of 40.0 kPa (300 mmHg,12.0 in.Hg) or less indicated withinone second after starting theengine?
Substitute a known-good ECM/PCM and rechock. lt symptom/indication go6s .way. .6plrceth€ original ECM/PCM.
Manifold Absolute Pressure (MAP) Sensor ('96 Modelsl (cont'dl
11-116

!Manifold Absolute Pressure (MAPI Sensor -
i;idlga lil;dels,'99 - 00 Dl6Y5 ensine with M/T)
ll
The scan tool indicates Diagnostrc Trouble code (DTC) Po108: A high voltage (low vacuum) problem in the
Manifold Absolute Pressure (MAP) sensor.
MAP SENSOR 3P CONNECTOR ICl11}
MAPIRED/GRNI
JUMPER WIRE
Wire side ol female terminals
vcclIYEL/RED)
ECM/PCM CONNECTOR D (16PI
MAP(RED/GRN)
sG1(GRN/WHT)
Wire side of female terminals
(cont'd)
11-121
The MIL has been reported on
OTC m108 is stolod.
Problem vetitication:
1. Start the engine. Hold the
engine at 3,000 rPm with no
load (in Park or neutral) until
the radiator fan comes on, then
let it idle.
2. Check the MAP with the scan
tool.
lntormittent lailure, sFtom k OK
.t thb time. Chock lor Poor con'
nections or loorg wires at Cll'l
|MAP sensorl snd ECM/PCM.
ls 101 kPa (760 mmHg,30 0 in.Hg)
or higher indicated?
Check tor an open in the MAP
36nSOt:1. Turn the ignition switch OFF
2. Disconnect the MAP sensor
3P connector.3. Install a jumper wire betlveen
the MAP sensor 3P connector
terminals No 3and No 2.
4. Turn the ignition switch ON (ll).
5. Check the MAP with the scan
tool.
ls 101 kPa (760 mmHg, 30 0 in.Hg)
or higher indicated?
Check for an open in wire (SG1
line):1. Remove the iumper wire.
2. Measure voltage between the
MAP sensor 3P connector te.
minals No. 1 and No 2
Rapai. open in the wito batwoen
ECM/PCM (D12) .nd MAP !en.or.ls there approx. 5 V?
Check for an oPon in the wiie
(MAP linel:1. Turn the ignition switch OFF.
2. Connect the ECM/PCM con-
nector terminals D3 and D12
with a iumPer wire.
3. Turn the ignition switch ON (ll).
4. Check the MAP with the scan
tool.
Repair opon in the wiles bstlt oon
ECM/PCM (D3l and MAP 3oGor.ls 101 kPa (760 mmHg, 30 0 in.Hg)
or higher indicated?
Substituto a known'good ECM/
PCM and rochock. ll normal MAP
is indicated, replace tho original
ECM/PCM.
JUMPER WIRE
lr,

PGM-FI System
Manifold Absolute Pressure (MAPI Sensor
11-122
('99 - 00 Models except D16YS engine with M/T) (contd)
The scan tool indicates Diagnostic Trouble Code (DTC) P0108: A high voltage flow vacuum) problem in theManifold Absolute Pfessure (MAp) sensor,
MAP SENSOR 3P CONNECTOR (C111I
MAPIRED/GRNI
Wire side of female terminals
vcclIYEL/RED)
ECM/PCM CONNECTOR C (31PI
JUMPER WIRE
Wire side of female terminals
Tho MIL has boon rcDortod on.DTC ml 08 b stolod.
Problem verification:'1. Start the engine. Hold theengine at 3,000 rpm with noload (in Park or neutral) untilthe radiator fan comes on, thenlet it idle.2. Check the MAP with the scantoot,
Intormittent f.ilu.e, rystom is OXat thi! time. Chock tor poor con-n6ction3 or looso wirea at C111(MAP 3en.or) and tho ECM/PC-M.
ls 101 kPa (760 mmHg.30in.Hg) or higher indicated?
Check for an open in the MAPaon5('r:1. Turn the ignalion switch OFF.2. Disconnect the MAP sensor3P connector.3. Install a jumper wire betwesnthe MAP sensor 3P conn6ctorterminals No.3 and No.2.4. Turn the ignition switch ON {ll).5. Check the MAP with the scantool.
ls 101 kPa (760 mmHg, 30in.Hg) or higher indicated?
Check fo. an opcn in wiro (SGlline):1. Removo the jumper wire.2. Measure voltage between theMAP sonsor 3P connector terminals No. 1 and No.2.
Roprir opon in tha wiJo bctwoenthc ECM/FCM (C7l rnd the MApsonln t.
ls there approx. 5 V?
Chsck for an open in tho wi.e{MAP lino}:1. Turn the ignition switch OFF.2. Install a jumper wire on theECM/PCM connectors betweenC7 and C17.3. Turn the ignition switch ON (ll).4. Check the MAP with the scantool,
Repair op€n in the wir6a bstwoontho ECM/FCM (C171 and rh6 MApscnltoa.
ls 101 kPa (760 mmHg, 30in.Hg) or higher indicated?
Substituto a known-good ECM/PCM and rechcck, It normal MAPis indiceted. r.place tho originalECM/PCM.
JUMPER WIRE
--

L
Manifold Absolute Pressure (MAP) Sensor (cont'dl
The scan tool indicates Diagnostic Trouble code (DTc) P1128: Manifold Absolute Pressure (MAP) lower than
exoected.
The scan tool indicates Diagnostic Trouble code (DTC) P1129: Manifold Absolute Pressure {MAP) higher than
exoected,
- Tho MIL has been t€Ported on.- DTC P1128 is stored.
Problem verification:1. Turn the ignition switch ON (ll).
2. Check the MAP with the scan
tool.
lntermitteni failu.e, sYstom i! OK
at thb time.ls 54.1 kPa (406 mm Hg, 16.0
in. Hg) or higher indicated?
- The MIL has been roported on.- DTC P1129 is slorod
Problem v6rilicaiion:1. Start the engine. Hold the
engine at 3,000 rpm with no
load (in Park or neutral) until
the radiator fan comes on,
then let it idle.
2. Check the MAP with the scan
tool.
Int6rmittent failuto, sy3tem i3 OK
at thi3 time.ls 43.3 kPa (325 mm Hg, 12 8
in. Hg)or less indicated?
11-123

PGM-FI System
Engine Coolant Temperature (ECTI Sensor
The scan tool indicates Diagnostic Trouble code (DTC) P0116; A range/performance problem in the EngrneCoolant Temperature (ECT) Sensor circuit.
The ECT Sensor is a temperature dependant resistor (thermistor). The resistance of the thermistor decreases as the enginecoolant temperature increases as shown oetow.
RESISTANCE(ko)
NOTE: lf DTC P0117 and/or P01'18 are stored at the same time as DTCfor DTC P0116.
Possible Cause
. ECT sensor deterioration. Malfunction in the thermostat and cooling system
Troubleshooting Flowchart
-a 32 68 r0a la0l?6 2t2 2481'rr-20 o 20 ao o D r@ Il, r'c)
ENGINE COOLANT IEMPERATURE
P0116, troubleshoot those DTCS first. then recheck
11-128
THERMISTOR
- The MIL has bogn reported on.- DTC P0116 is stored.
Problem verification:1. Start the engine. Hotd theengine at 3,000 rpm with noload (in Park or neutral) untilthe radiator fan comes on,then let it idle.2. With the scan tool, check the
Intermiftent lailure. system is OKai thi. time. Ch.ck the thc.mo-stat 6nd thc cooling system.
is 176 200'F {80 - 93'C)or0.0-0.TVindicated?
Check the thermostat and thecooling system. ll they als OK,raplace the ECT sensor.

PGM-FI System
Throttle Position (TPl Sensor ('99 - 00 Models except D16Y5 engine with M/T)
lTO12Z _TI scan tool indicates Diaqnosttc Trouble Code (DTC) P0122: A low voltage problem in the Throttle position- { | r, sensoa crrcurl.
The TP Sensor is a potantiometer. lt is connected to the throttle valve shaft. As the throttle position changes, the throttleposition sensor varies the voltage signal to the ECM/PCM.
ERUSHHOI.DENOUTPUT VOLTAGE (VIBRUSH
BESIS?OF
TERi'I AL
5
4
3
2
1
o
INNERBUS}IINGTHROTTLEOPE II{G
FULLTHROTTLE
TP SENSOR 3P CONNECTOR {Cl1OI
sG2IGRN/8LKIvcc2(YEUBLUI
Wire side of temale terminals
ECM/PCM OONNECTOR C 131P)
Ch.Gk for rn opan or 3hort in TP36nlot:1. Turn the ignition switch OFF.2, At the sensor side, moasureresistance between the TPsensor 3P connector terminalsNo. 1 and No. 2 with th€ throt,tle fully closed.
(To page 11-135)
- Th. MIL har boon.6portcd on.- DTC P0122 b siored.
Problem verification:1. Start the engine, Hold theengine at 3,000 rpm with noload (in Park or neutral) untilthe radiator fan comes on.then turn the ignition switchOFF,2. Turn the ignition switch ON (ll).3. Check the throttle positionwith the scan tool.
ls there approx. .49 V whenthe throttle is fully clos€d andapprox, 4.5 V when the throttleis fully opened?
l||t rmittont failura, lyrtom b OKat thi! tima. Chock tor poor con-nactionr o. looao wires rt C110{TP 3.n!or} rnd ECM/PCM.
Check for an opan or 3hort in thowi.c (VCC2 linc):1. Turn the ignition switch OFF.2. Disconnect the TP sensor 3Pconnector,3. Turn the ignition switch ON (ll).4. Measure voltago betweenthe TP sensor 3P connector terminals No. 1 and No.3.
ls thero approx. 5 V?
Chccl tor .n opln in wiro IVCC2lin€l:Mgasure voltago between ECM/PCM connector terminals C18 and
R.prir opcn in the wiro bctw.enECM/PCM (C281 and TP 3€nror.ls there approx. 5 V?
Subrtituto r known-good ECM/PCM .nd rochcck. lf pro.c.ibedvoltaga i! now available, roplacotho origin.l ECM/PCM.
Wire side ol female terminrls
Terminal side of male terminals
11-134
L