1998 ACURA INTEGRA Service Repair Manual

{From page 11 52)
Chock lor a shon in lhe wi.asiVCC1. VCC2lin$l:1. Turn the ignition switch OFF-2. Disconnect the ECM connec,tor D (16P).
3. Check lor continuity betweenbody ground and ECM con-nector terminals D4 and D10individually.
- Repair short to body groundin tho wire between ECM {D4land MAP 3enso..- Rep.ir short to body groundin the wire between ECMlD10l, TP sensor and Fueltank pa6ssure sanso..
Chock lor an op€n in the wire3{lGP1.lGP2lines):1. Turn the ignition switch ON (ll).2, Measure voltage betweenbody ground and ECM connec-torterminals A'11 and A24 indi-vadually.- R6pe;r open in the wire{slbetween ECM 1A11, A24l andPGM-FI main .elay.- Check for poor connectionsor loose wi.es at the PGM-FImain relay.- Test tho PGM-FI main ral.v(see page 11-124).Check for an open in the wires(LG1, LG2line3l:1. Reconnect all sensor connec-tors.2. Reconnect the ECM connectorD (16P).
3. Turn the ignition switch ON (ll).4- M easu re voltage betweenbody ground and ECM connector terminals A9 and A22individually.
Repai. open in the wir€ls)bctween ECM {A9, A22l .ndG101 ihet had more then 1.0 V.
ls there lessthan 1.0 V?
Substitute , known-good ECMand rechock. f symptom/indica-tion goes away, roplac6 the odgi-n3l ECM.
Wire side of female terminals
ECM CONNECTOR A I32P)
a,
Wire side of female terminals
LGl
1 1-53

J
i
'ilPGM-FI System
Manifold Absolute Pressure (MAPI Sensor
The scan tool indicates Diagnostic Trouble Code (DTC) P0107r A low voltage (high vacuum) problem in the
N4anifold Absolute Pressure (MAP) sensor.
The MAP sensor converts manifold absolute pressure into electrical signals and inputs the ECM.
OUTPUTVOLTAGE
(vt3.5
2.5
2.O
1.5
1.0
0.5
0lin.HglGAUGEREADING(mmHgl
MAP SENSOR 3P CONNECTOR IC114I
vccrIYEL/REDI
i
Ii
{
il
The MIL haa baen raportGd on.DTC P0107 is storcd,
Problem ve.ification:L Turn the ignition switch ON (ll).
2. Check th€ MAP with the scantool.
Intermittent tailulo. systam i! OKat thk lime. Chock tor pooa con-noctions or loosa wir.3 al C114{MAP s€n3orl dnd ECM.
ls approx.0 kPa (0 mmHg.0 in.Hg)or 2.8 V indicated?
Chcck lor an opan or 3hoJt in thoMAP 3on!or:1. Turn the ignition switch OFF.2, Disconn6ct th6 MAP sensor3P conn6ctor.3. Turn lhe ignition switch ON (lll.
4. Ch€ck the MAP with the scantool.
ls approx.0 kPa (0 mmHg,0 in.Hg)or 2.8 V indicated?
Ch6ck for .n op.n in wiro IVCCIlin.l:Measure vollage betwe€n theMAP sensor 3P conn€ctor termi'nals No. l and No.2,
R.pair op.n in thc wile lrotweenECM {Dll and MAP sensoi.ls there approx.5 V?
(To page 11-55)
Wire side of female terminals

(From page t 1-54)
Check for a 3hort in th€ wiae(MAP linel:1. Turn the ignition switch OFF.2. Disconnect the ECM connector D {16P}.3. Check for continuity betweenthe MAP sensor 3P connectorterminal No. 3 and bodygrouno,
Repeir short in th. wirg b€{woenECM lD3l and MAP s6n3or.
Substitute a known-good ECMand rochack. lf no.mal MAP b indi-catod, r€place the original ECM,
MAP SENSOR 3P CONNECTOR {C114)
MAP(RED/GRN)
Wire side of fomalelerminals
1 1-55

PGM-FI System
Manifold Absolute Pressure (MAPI Sensor (cont'dl
tF'r'sl li:"J:ilfi::il***:ilHi""k:"
code (Drc) P0108' A hish vo*ase (row vacuum) probrem in the
Thc MIL has b6en reoortod on.OTC P0108 is stored.
Problem veritication: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 wlth the scantool,
Intermittent f.ilure, svstem is OKal this time. Check lor Door con-nections or loose wires at C114{MAP sensor} and ECM.
ls 101 kPa (760 mmHg,30.0 in.l-lg),1.0 V or higher indicated?
Chock tor an opcn in th. MAPs€nsoa:1. Turn the ignition switch OFF.2. Disconnect the MAP sensor3P connector.3. Install 6 jumper wire betweenthe MAP sensor 3P connectorterminals No.3 and No.2.4. Turn the ignition switch ON (ll).
5. Ch€ck the MAP with the scantool.
ls 101 kPa (760 mmHg,30.0 in.Hg),1.0 V or higher indicated?
Check tor an open in wire (SG1
linel:1. Remove the jumper wire.2, Measure voltage between theMAP sensor 3P connector teFminals No. I and No.2.
Repair open in the wire betweenECM l012l and MAP s€nsor.ls there approx.5 V?
Check for an open in the wire{MAP line):1. Turn the ignition switch OFF.2. Install a jumper wire on theECM co n nector terminalsbetween D3 and Dl2.3. Turn the ignition switch ON lll).4. Check the MAP with the scantool,
ls 101 kPa (760 mmHg,30.0 in.Hg),1.0 V or higher indicated?Repair open in the wires betweenECM {D3, and MAP s6Gor.
Substitut€ a known-good ECMand recheck. It normal MAP isindicaied, rgplace the originalECM.
MAP SENSOR 3P CONNECTOR {C114}
Wire side of female terminals
L
vccr{YEL/RED)
MAP IWHT
JUMPERWIRE
SG1 (GRN/WHT}
Wire side of female terminals
1 1-56
{GRN/WHT)I ] {RED/GRN)
ECM CONNECTOR D {16P}
L

The scan tool indicates Diagnostic Trouble Code (DTC) P1128: Manifold Absolute Pressure (MAP) lower rhan
expected.
The scan tool indicates Diagnostic Trouble Code (DTC) P1129: Manifold Absolute Pressure (MAP) higher than
expected.
- Th€ MIL has b€en reoortod on.- DTC Pl128 is stored.
Problem vorification:1. Turn the ignition switch ON {ll}.2. Check the MAP with the scantool,
ls 54.1 kPa (406 mmHg, 16.0in.Hg) or higher indicated?Intermittent laihre, system i3 OKat this time.
- The MIL has been reooned on.- DTC P1129 is stored.
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 scantool.
ls 43.3 kPa (325 mmHg, 12.8in.Hg) or less indicated?Intermittoni lailure.3ystem is OKat this time.
11-57

PGM-FI System
Intake Air Temperatute (lATl Sensor
The scan tool indicates Diagnostic Trouble Code (DTC) P0112: A low voltage (high temperature) problem in the
lntake Air Temperature (lAT) sensor circuit.
The IAT Sensor is a temperature dependant resistor (thermistor). The resistance of the thermistor decreases as the intake
air temperature increases as shown below.
RESISTANCE IKO)
THERMISTOR
l1\
\'/
rb lllo,'.u
I
1r3 2r2 2.a l.Flm roo r20 toc)
INTAKE AIR TEMPERATURE
lf the engine is warm, it will be higherthan ambient temperature.
IAT SENSOR CONNECTOR ICl2OI
- The MIL h.s b€an rooorted on.- DTC P0112 is stored.- Or lrom Probable Cau3e List.
P.oblem v6rificationi1. Turn the ignition switch ON lll).2. Check the IAT wirh the scantool.
ls 302'F (150"C) or higher (or
H Limit in Honda mode o{ thePGM Tester) or 0 V indicated?
ls the correct ambient temPerature indicated*?Roolace the IAT sensor.
Into.mittent feilur6, aystem h OKat this timc. Check to. Doot con-nections or loose wires at Cl20{lAT sensor) snd ECM.
Check tor a 3hort in the IAT sen-
1. Disconnect the IAT sensor con
2. Check the IAT with the scantool.
ls 302"F (150'C) or higher (or
H Limit in Honda mode of thePGM Tester) or 0 V indicated?Reolace the IAT sonsor.
Check for a short in the wire (lAT
line):1. Turn the ignition switch OFF.2. Disconnect the ECM connec-tor D (16P).
3. Check for continuity betweenIAT sensor connector terminalNo.2 and body ground.
Rooair short in the wirc botwoenECM {D8) .nd IAT sen3or.ls there continuity?
Substitut€ s known-good ECMand rccheck. lI normal IAT is indi-cated, replace the originel ECM.
1 1-58
Wire side of lemale terminals
L

The scan tool indicates Diagnostic Trouble Code (DTC) P0113: A high voltage (low temperature) problem in the
Intake Air Temperature (lAT) sensor circuit.
IAT SENSOR CONNECTOR ICl2OI
sG2IGRN/BIKI
JUMPEB WIRE
IAT IREDTYELI
Wire side of temale terminals
ECM CONNECTOR D (t6PI
IAT
sG2IGRN/BLUI
tRED/YEL)-JUtvtPERWTRE
Wire side of female terminals
Tho MIL ha3 b€on i6ponod on.DTC m113 i3 3lor.d.
Problom vcrification:1. Turn the ignition switch ON (ll).
2. Check the IAT with the scantool.
Int.rmitt.nt t.ilura. .yatrm iaOK .t thi! tim.. Ch.ck fo. poolconnaclion3 or loota wirca atC120 llAT r.nrorl .nd ECM.
ls -4"F {-20"C}or less (or L-Limit in Hond mode of PGMTester) or 5V indicated?
Ch.ck tor an open in ihe IAT s6n-30r:1. Disconnect the IAT sensorconnectot,2. Install a jumper wire betweenthe two terminals on the IATsensor connector,3. Check the intake air tempera-ture with the scan tool.
ls -4'F (-20"C) or less {or L-Limit in Hond mode of PGMTester) or 5 V indicated?
Chock to. an opon in thc wiros(lAT, SG2 lin6l:1. Turn the ignition switch OFF.2. Install a jumper wire betweenECM connector terminals D8and D11.3. Turn the ignition switch ON lll).4. Check the IAT with the scantool.
ls -4'F {-20'C} or less (or L-Limit in Hond mode ot PGMTester) or 5 V indicated?
Raprir opan in tha wira!b.tw.cn ECM {D8, D11} and th.lAT aanao.,
Subatitut6 a known.good ECM.nd roch.ck. ll normal IAT i. indi-cated, roplacc the o.iginal ECM.
1 1-59

PGM-FI System
Engine Coolant Temperature (ECTI Sensor
Ip01161 Ihe,scaltool indicates Diagnostic Trouble Code (DTC) P0116: A range/performance problem in the Engine: Coolant Temperature {ECT) Sensor circuit.
The ECT Sensor is a temperature dependant resistor (thermistor). The resistance of the thermistor decreases as the engine
coolant temperature increases as shown below.
RESISTANCEtkol
! 32 68 104 140 i 76 212 248 { "F)-20 o 20 'ra, qt Il rd' t20 r'c)
ENGINE COOLANT TEMP€RATURE
P01 16, troubleshoot those DTCS first, then trou-NOTE: lf DTC P0117 andlo( Po'l'18 are stored at the same time as DTC
bleshoot DTC P0'l16.
Possible Cause
. ECT sensor deterioration
. Malfunction in the thermostat and the cooling system
lroubleshooting Flowchart
I
1 1-60
THERMISTOR
- Th€ MIL has been reoorted on.- DTC P0116 is stored.
Problem veritication:1. Start lhe engine. Hold theengine at 3,000 rpm with noload (in Park or neutrall untilthe radiatorlan comes on, thenlet it idle.2. With the scan tool, check theECT,
Inlermittent failure, system is OKat this time. Chock tho thermostaland th€ cooling syst6m.
ls 176 - 200"F (80 - 93'C) or0.4-0.TVindicated?
Check the thermostat and thecooling system. It th€y ara OK,reolace the ECT sensor,