1998 ACURA INTEGRA Map sensor

PGM-FI System
System Description
ENGINE CONTROL MODULE (ECM)OUTPUTS
*1: USA*2: 818C1 engine*3: A,/T*4: 818C1, 818C5 engines
PGM-FI Sy3tem
The PGM-Fl system on this model is a sequential multiport fuel injection system.
Fuel lniector Timing and Duration
The ECM contains memories for the basic discharge durations at various engine speeds and manifold pressures. The
basic discharge duration, after being read out from the memory. is further modified by signals sent from various sensors
to obtain the final discharge duration.
ldle Air Control
ldle Ai. Control Valve (lAC Valve)
When the engine is cold, the Ay'C compressor is on. the transmission is in gear (Ay'T only)the brake pedal is depressed, the
P/S load is high, or the alternator is charging, the ECM controls current to the IAC Valve to maintain correct idle speed.
lgnition Timing Control
. The ECM contains memories for basic ignition timing atvarious engine speeds and manifold pressures, lgnitiontiming
is also adjusted for engine coolant temperature.
. AKnockControl System isadoptedwhich sets the ideal ignition timing for the octane n um ber of gasoline used*r,
Other Control Functions
L Starting Control
When the engine is started, the ECM provides a rich mi{ure by increasing fuel injector duration.
2. Fuel PumD Control
. When the ignition switch is initially turned on, the ECM supplies ground to the PGM-FI main relay that supplies
current to the fuel pump for two seconds to pressurize the fuel system.
. When the engine is running, the ECM supplies ground to the PGM-FI main relay that supplies current to the fuel
DUmO.
. When the engine is not running and the ignition is on. the ECM cuts ground to the PGM-FI main relay which cuts
current to the fuel oumo.
INPUTS
TDc/CKP/CYP Sensor
CKF Sensor
MAP Sensor
ECT Sensor
IAT Sensor
TP Sensor
HO2S
VSS
BARO Sensor
ELD*1
Starter Signal
ALT FR Signal
Air Conditioning Signal
A,/T Gear Position Signal*3
Battery Voltage (lGN.1)
Brake Switch Signal
PSP Switch Signal*'
Knock Sensor*1
VTEC Pressure Switch*4
Fuel Tank Prssure Sensor
Fuel InjectorTiming and Duration
Electronic ldle Control
Other Control Functions
lgnition Timing Control
ECM Back-uD Functions
Fuel-lnjectors
PGM-Fl Main Relay (Fuel Pump)
MIL
IAC Valve
A,/C Compressor Clutch Relay
Radiator Fan Belay*1
Condenser Fan Relay
ALT*1
rcM
EVAP Purge Control Solenoid
Valve
H02S Heater
VTEC Solenoid Valve*'
IAB Control Solenoid Valve*,
EVAP Bypass Solenoid Valve
EVAP Control Canister Vent
Shut Valve
11-48

NOTE:. Whon there is no cod6 stored, the MIL willstay on iftho aorvice check conn€ctor is snoned.' lfthis symptom is intermittent. check tor:- A loos6 Fl E/M (15 A) in the undor-hood tuse/relav box- A loose No. 13 FUEL PUMP {SRS UNIT) (15 A) in th6 under-dash fuse/retay box- An intermitt6nt short in the wir€ betwesn the ECM (C7) and th€ sorvice chock conn€qor- An intormittent open in the wire between the sorvice chsck conneclor and G40l- An intermittent short in the wire betwo€n the ECM (A18) and the gaug6 assemDry- An intermittent shon in the wir6 between the ECM (D14) and the MAP sonsor- An intermittent shon in the wire bstween the ECM (Dto), th6 Tp sensor and Fu6l tankpI6SSU16 SOnSOT- PGM-FI Main relay. See th6 OBD ll scan tool or Honda PGM Tester user's manuals for sp6cific operating instruc-!ons.
(To page 11-52)
(cont'd)
Th. M.lfunction Indic.tor LlmplMlll .t!yr on or comlr on ltt .two aaconda.
Ch.ck th! Dirgnoitic tioubl.Cod. IDTC):'1. Connoct a 6can tool or HondaPGM Tester,2. Turn tho ignition switch ON (ll).3. Read tho DTC with the scantool or Honda PGM T6st6r.
Go to trouHorhooting proQduaaa.
koo p.g6 I 1.3:ll
Ch.ct th. DTC by MIL indication:1. Turn th€ ignition switch OFF.2. Connect the SCS seNic€ con-n€ctor to the sorvico checkconnoctor,3. Turn the ignition s1\,itch ON (ll).
Rapair opan or ahort in wirabotw..n thg ECM lCSl .ndData Llnk Conncctor.Go lo troublcrhootlng pro-c.dur.3. {.co pag. 11-32)
Do.s th6 MIL indicate anv DTC?
Try to start tho engine.
Chack lor r 3hort in th. wlr.3lsqg lln.):1. Turn the ignition switch OFFand turn the ignition switchoN { },2. Disconnect th6 SCS serviceconnector,3. M€a6urg voltaOe between theECM connoctor torminal C7and body ground.
Rapah 3hort to body ground inlh. wir. b.lw..n ECM lCTl .ndacwica chack connactor.
ls ther6 approx. 5 V?
\{,
(To page 11-52)
11-51

PGM.FISystem
Gontrol Module (ECMI (cont'dlEngine
\
L
(From page 11-51)
Choc* tol s short in tho wir6 lMlLlino):1. Turn the ignition switch OFF.2. Disconn€ct the ECM conn6c-tor A (32P).
3. Turn the ignition switch ON (ll).
Repair 3hon to body ground in
rhe wire bstw.on tho ECM (A181
and MlL.
Substituto s known-good ECMend rechock. H 3ymptom/indica-tion goes awry, replacc tho origi-nelECM,
{From page 11-51)
Inspect Fl E/M (15 A) fuse in theunder-hood Iuse/relay box.
- Ropsir short in tha wircbotw.on Fl E/M {'15 Al tu3c'rnd PGM-FI m.in t.lry.- Rool.c. Fl E/M l15A)tu!€.
Inspect No. 13 FUEL PUMP (SRS
UNIT) ('l5A) fuse in the undeFdash fuse/relay box.
- Reo.ir sholt in th. wirobotw..n No. 13 FUEL PUMP
{SRs UNIT) (15 Al fur..ndFGM-FI m.in rclay.- Repl.co No. 13 FUEL PUMP(SRS UNIT) {15 Alturr.
Ch6ck for . shon in a son3or1. Turn the ignition switch ON (ll).
2. Disconnect the 3P connectorfrom oach sensor one at time:. MAP sensor. TP sensor. Fueltank pressure sensor
Rapl.cc tha 3onaor thrt cauaadihe light to 9o out.Does the MIL go OFF?
1-52
(To page 11-53)

{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

PGM-Fl System
Fuel Supply System
lF0{7il Thescantool indicates Diagnostic Trouble Code (DTC) P0171:Theluel system rstoo lean
[F0i72l Th" ""un tool indicates Diagnosric Trouble code (DTc) p0,172: The fuet system is too rich
Description
By monitoring the Long Term Fuel Trim, long term malfunctions in the luel system will be detected
lf a malfunction has been detected during two consecutive trips, the MIL will come on and DTC P0171 and/or P0172 will be
stored.
NOTE: lf some ol the DTCS lasted below are stored at the same time as DTC PolTl and/or P0172 troubleshoot those DTCS
first, then troubleshoot DTC P0171 andlot P0172
PO107, P0108, P1128. P1129: MAP Sensor
P0135: Primary HO2S Heater (Sensor 1)
P0137, P0138: Secondarv HO2S (Sensor 2)
P0141: Secondary HO2S Heater (Sensor 2)
P1259: VTEC Svstem
Possible Cause
DTC P0171
too lean
Drc P0172
Svstem too rich
. Fuel Pump insufficient flowpressure
. Fuel Feed Line clogged, leaking
. Fuel Pressure Regulator stuck open
. Fuel Filter clogged. Fuel Iniector clogged, air inclusion
. Gasoline doesn't meet Owner's Manual spec.
. Primary HO2S (Sensor 1)deteriorated
. Valve Clearance. Exhaust leak
. Fuel Pressure Regulator clogged, stuck closed
. Fuel Return Pipe clogged
. Fuel Iniector leaking
. Gasoline doesn't meet Owner's Manual spec
' Primary Ho2s (Sensor 1) deteriorated
. Valve Clearance