1998 ACURA INTEGRA valve

System DescriPtion
Electrical Connections
FUELIN'ECTOHS
EVAP COIiTIBOL CANISTEAvE|rISHUT VAIVE
sotENoto vaLvE
lo FAOIAIOB FAN FELAY,CONOEI{SEh FAN FELAY
FUSESr-1) BATTERY {100 A)*
€) INTERIOF LIGHT {7.5 A}.
€) HORN STOP 120 A)'
o rcl (,$ A)*
o BACK UP IRADIO) 17.5 A)*
@ Fr €/M t15 Al'.'I NO. .I3 FUEL PUMP ISRS UNIN (15 A)
a,J No. 25 METER 17.5 Al
O No. 15 ALTERNATOR SP SENSOR {7.5 A}(0 No. 17 HEATER A/C R€LAY (7.5 A)(i) No. 31 STAnTEB SIGNAL (7.5 A)
*: in the under'hood fuse/relaY box

t;
System Description
sG2
Electrical Connections (cont'd)
c223 CiOSi
I
PO2SHTC
vccl
vcc2
cnl6lu'
OFN/BLK
YEVWHT
WHT/YEL
REO/YEL
YEVBLU
RED/ALX
WHI/qFN
TPS
neo,wrtrJffil
oFN/Btx--1-:JECt SE SOR
neonerJf$l
cnvELx--L# |IAT SENSOR
vsveLu--JJr[5lneozgr.x--_l F--? |cnN/Blx 1-:JfP SENSOR
".,.""11--,"u-l
I WECSOLENOIDI VALVE
VTEC PIIESSUFEswtTcH
-+ BLU/BLK - |----o o--l I- +- aq'- --l # |
+ i crdl
fr i-'-
t'=- - -
l
*-,*{Fli
,.,__!i
CXFSEN90B
._.._.._..J
PAI||ARYHO2S (SENSOR 1)cfl4ft'-------------1YEVBED ---l f .g--t- IFEo/cBN ___l F=-< f Icnr,wxr"_ lFj IIIAP SENSOB
cill
*4: 818C1, 818C5 engines*5: 81881 engine
11-16

_{-]
..*-l--1E____]:l
EFAXE SWITCH
taa,t"r-{YEVGR

----
YEL/8rx --]
IeLx,'YrKI.--GRI,/ELU'--- lYEVGR| ---
eu--------1
FUEL TANKPRE9SUNE SENSOR
c793
EVAP BYPASSSOLENOIOVALVE
. ,.tn"* jf ,.rn""YEVBLU -l F YEV9LUr-r cnrf lI r-r cnlrt-GRN/BLX I f cRri,/ErxBLK/YEL I l Br.t<,/wrreru' l| alrf-
Brx/,r'rrr lf Erx/wrr
11-21

Troubleshooting
Troubleshooting Procedures (cont'd)
Symptom Chart
Listed below are symptoms and probable causes for problems that DO NOT cause the malfunction Indicator Lamp (MlL) to
come on. lf the MIL was reported on, go to page 11-32.
Troubleshooting each probable cause in the order listed (from left to right) until the symptom is eliminated.
The probable cause and troubleshooting page relerence can be found below.
Other Probable Causes for an engine that will not start:
Engine will not sta rt- Compression- Engine locked up- Timing belt
\_
- Starting system- Overheating- Battery
'4,
It
Probable Cause List (For the DTC chart. see page 11-421
Probable CausePageSystem
111-50Engine Control Module (ECM)
211118Fuel pressure
311-124PGM-Fl main relay
4Section 23lgnition system
51 1-83Crankshaft Position/ToD Dead Center/Cylinder Position sensor circuit
11-58Intake Air Temperature (lAT) sensor circuit
71 't- 100ldle Air Control (lAC) Valve
811110Fast idle thermo valve
I11lllldle speed adjustment
'1011-132Throttle body
111 1-130Throttle cable
1211-54lvlanifold Absolute Pressure {MAP) sensor
IJ1163Throttle Position {TP) sensor
1411-86Barometric pressure (BARO) sensor
1 '1 106A/T gear position signal {see section 23)
16'1 1 104Brake switch signal
1711 129Air Cleaner
181 1- 134Intake Air Bypass {lAB} control system and intake air pipe
19'1 1 138Three Way Catalytic Convener (TWC)
2011-141Evaporative emission (EVAP) control
21Contaminated fuelll ll 21 | - | cont"-in"t"o tu"
11 l-
I
,l 11-36
-
SYMPTOMPROBABLE CAUSE
Engine will not stan4, 2, 3,5, 21, 15, 1
Hard starting2, 4, 12, 14,20,21
Cold fast idle too low
Cold fast idle too high7, 8, 9, 11, r0
ldle speed fluctuates7,8,9,11,10
Misfire or rough runningTroubleshoot for misfire on pages 11-78,79
Low power2, 10,'t1, 13, 14, 17, 19, 12
Engine stalls2, 4,1 , 12,21,9, 5, 16

Troubleshooting
DataDescriotionOperating ValueFreeze Data
HO25
Feedback
Loop Status
Loop status is indicated as "open" or "closed".
Closed: Based on the H02S output, the ECM deter-
mines the airlfuel ratio and controis the amount of
iniected fuel.
Open: lgnoring HO2S output, the ECM refers to sig-
nals from the TP, MAP, and ECT sensors to control
the amount of iniected fuel.
Al idle speed: closed
YES
Short Term
Fuel Trim
The airlfuel ratio correclion coeificient lor correcting
the amount ol iniected fuel when HO2S feedback is in
the closed loop status. When the signal from the
HO2S is weak, short term fuel trim gets highef. and
the ECM increases the amount of injected fuel The
airlfuel ratio gradually gets richer, causing a higher
HO2S output.
Consequentlv, the short term fuel trim is lowered, and
the ECM reduces the amount of injected tuel. This
cycle keeps the airlfuel ratio close to the stoichiomeric
ratio when in closed loop status.
-30o/" - + 41%
YES
Term
Trim
Long
F uel
Long term fuel trim in computed trom short term fuel
trim and indicates changes occurring in the fuel sup-
ply system over a long period.
lf long term fuel trim is higher than 1.00, the amou nt
of injected fuel must be increased. ll it is lower than
1.00, the amount of iniected fuel must be reduced
-14% - + 2Oo/"
YES
lntake Air
Temperature(rAT)
The IAT sensor converts intake air temperature into
voltage and signals the ECM. When intake air temper-
ature is low, the internal resistance of the sensor
increases, and the voltage signal is higher.
With cold engine:
Same as ambient temPer-
ature and ECTYES
Throttle
Position
Based on the accelerator pedal position. the opening
anole of the throttle valve is indicated.
Ar idle: Approx. 107o
At full throttle: Approx.
90%
YES
lgnition
Timing
The ignition advance angle is set by the ECM. The
EClvl matches ignition timing to the driving condi-
tio ns.
At idle speed: 16 t 2'
BTDC with the SCS ser-
vice connector connected.
NO
Calculated
Load Value
(CLV)
CLV is the engine load calculated from the MAP data.At idle speedi
15 - 35%
At 2,500 rpm with no load:
12 - 30./.
YES
-38

Engine Control Module Terminal Arrangement
ECM CONNECTOR A I32P}
ECM CONNECTOR A I32PI
*1: USA*2:818C1 engine*3:A,/T*4: 818C1, 818C5 engines
female terminals
NOTEr Standard battery voltageis 12 V.
{cont'di
LG22A
TerminalWireTerminal nameDescriptionSignal
YELlNJ4 (No. 4 FUEL INJECTOR)Drives No. 4 fuel iniector.With engine running: pulses2BLUlNJ3 (No.3 FUEL INJECTOR)Drives No. 3 fuel injector.
3REDlNJ2 (No.2 FUEL INJECTOB)Drives No.2 fuel injector.
BRNlNJl (No. 1 FUEL INJECTOR)Drives No. l Iuel iniector.
5GRN/REDS 02SHTC (SECONDARY
HEATED OXYGEN SENSORHEATER CONTROL)
Drives secondary heated oxygensensor heater,With ignition switch ON (ll)i battery volrageWith fully warmed up engine runningiduty controlled
6ORN/BLKP O2SHTC {PRIMARY HEAIEDOXYGEN SENSOB HEAIERCONTFOL)
Draves primary heated oxygensensor heater,With ignition swirch ON (ll): battery voltageWith lully warmed up engine running:duty controlled
84G RNI/ELVTS (VTEC
SOLENOID VALVE)Drives VTEC solenoid valve.With engine at low rpm: 0 VWith engine at high rpm: battery voltageIBRN/BLKLG1 (LOGIC GROUND)Ground for the ECM control circuit.Less than 1.0 V at alltimes10BLKPGl (POWER GROUND)Ground for the EC[, power circuit.Less than 1.0 V at all times't'lYEUBLKIGPl {POWER SOURCE)Power source for the ECMcontrolcircuit.With ignition switch ON 1ll): battery voltageWith ignition switch OFF| 0 V
12BLI(8LUIACV(IDLE AIR CONTROL VALVE}Drives IACV.With engine running: about 6 V 10 V(depending on engine speed)
REDPCS (EVAP PURGE CONTROLSOLENOID VALVE)Drives EVAP purge controlsolenoid valve.Wilh engane running, engine coolant above154"F (68'C): duty controlled
GRN/BLUFLR (FUEL PUMP RELAY)Drives fuel pump relay.0 V for two seconds after turning ignitionswitch ON (ll), then battery voltage
17B LVBEDACC (fuC CLUTCH RELAY)Drives A,/C clulch relay.With compressor ON: 0 VWith compressor OFFt baftery voltage
18GRN/ORNMIL (I\4ALFUNCTION
INDICATOR LAMPiDrives MlL.With MIL turned ON:0 VWjth MIL turned OFF: battery vottage
19*,WHT/GRNALTC (ALTERNATOR
CONTROL)Sends alternator control signal,With fully warmed up engine runninglbattery voltageDuring driving with small electrical load: 0 V
20YEUGRNICM (IGNITION CONTROLMODULE)Sends ignition pulse.With ignition switch ON (ll): battery voltageWith engine running: about'10 V(depending on engine speed)22BRN/BLKLG2 (LOGIC GROUND)Ground forthe ECM controlcifcuit.Less than 1.0 V at all times8LKPG2 (POWEfl GROUND)Ground for the ECM power circuit.Less than 1.0 V at all times
24YEUELKIGP2 (POWER SOURCE)Power source for the ECMcontrolcircuit,With ignition switch ON {lli: battery voltageWith ignition switch OFF: 0 V
25*3WHT/BLKVREF (REFERENCE VOLTAGE)Provides reference voltage toother control units,With ignition swirch ON (ll): about 5 VWath ignition switch OFF: 0 V
26. 'PNK/8LU
IAB SOL (INTAKE AIR BYPASSCONTROL SOLENOID VALVE)Drives IAB conlrol solenoidWith engrne running, engrae speed betow5,750 rpm: battery voltageWith engine running, engine speed above5,750 rpm: 0 V
27* IGRNFANC (BADIATOR FANCONTROL)Drives radiator fan relay.With radiator {an running: 0 VWith radiator Ian stopped: battery voltage
2ABLU2WBS (EVAP BYPASSSOLENOID VALVE)Drives EVAP bypass solenoidWith ignition switch ON (ll): battery vottage
29LT GRNVSV (EVAP CONlROLCANISTER VENT SHUT VAVLE)Drives EVAP control canister ventshut valve.Wilh ignilion switch ON lll): banery votrasc
1 1-39

DTC(MlL indicationlDeteciion ltemProbable CausoPage
P013s {41)
Primary Heated Oxygen Sensor
Heater
Circuit Malfunction {Sensor '1)
. Open or shon in Primary HO2S (Sensor 1) heater
circuit. ECM1't-74
P0137 (63)Secondary Heated Oxygen
Sensor
Circuit Low Voltage (Sensor 2)
Short in Secondary HO2S (Sensor 2) circuit
Secondary H02S {Sensor 2)
ECM11-7'l
P0138 {63)
Secondary Heated Oxygen
Sensor
Circuit High Voltage (Sensor 2)
Open in Secondary HO2S (Sensor 2) circuit
Secondary HO2S (Sensor 2)
ECM
P0139 (63)Secondary Heated Oxygen
Sensor
Slow Response (Sensor 2)
Secondary HO2S (Sensor 2)
P0141 (651Secondary Heated Oxygen
Sensor Heater
Circuit Malfunction (Sensor 2)
. Open or short in Secondary HO2S(Sensor 2) heater circuit. ECM11-'14
P0171 (45)
System Too LeanFuel supply system
Primary HO2S {Sensor I )MAP sensor
Contaminated fuel
Valve clearance
Exhaust leakage
11-76
P0172 t45l
System Too RichFuel supply system
Primary HO2S (Sensor 1)
MAP sensor
Contaminated fuel
Valve clearance
11.76
,...,{iil
174l
Random Misfirelgnition system
Fuel supply system
MAP sensor
IAC valve
Contaminated fuel
Lack offuel
't 1-78
P0301 (71)
P03Q2 l'121
P0303 (73)
P0304 (74)
- Cylinder 1- Cylinder 2- Cylinder 3- Cylinder 4
Misfire Detected
Fuel injector
Fuel injector circuit
lgnition system
Low compression
Valve clearance
11-79
P0325 {23)
Knock Sensor Circuit
MalfunctionOpen or short in Knock Sensor circuit
Knock Sensor
ECM11-82
P0335 (4)Crankshaft Position
Sensor Circuit
Malfunction
Crankshaft Position Sensor
Crankshaft Position Sensor circuit
ECM1 1-83
P0336 (4)Crankshaft Position
Sensor
Range/Performance
. Crankshaft Position Sensor. Timing belt skipped teethIl-83
P0420 (67)Catalyst System Efficiency
Below Threshold
. Three Way Catalytic converter. Secondary HO2S11-139
(cont'd)
11-43

Troubleshooting
Diagnostic Trouble Code (DTCI Chart (cont'd)
L
DTC
(MlL indication)Detection ltemProbable CausePage
P0452 (91)FuelTank Pressure Sensor Circuit
Low lnput
Short in Fuel Tank Pressure Sensor circuit
Fuei Tank Pressure Sensor
ECM
11 142
P0453 (91)Fuel Tank Pressure Sensor Circuit
High Input
Open in Fuel Tank Pressure Sensor circuit
Fuel Tank Pressure Sensor
ECrVI
11-144
P0500 {17}
Vehicle Speed
Sensor Circuit
Malfunction
Vehicle Speed Sensor
Vehicle Speed Sensor circuit
ECM
11-85
P0505 (14)ldle Control System
Malfunction
IAC valve
Fast idle thermo valve
Th rottle Body
'11-98
P0700
P0715
P0120
P0125
P0730 (70)
P0740
P0753
P0758
Automatic Transaxle
section'14
Pl106 (13iBarometric
Pressure Circuit
Range/Performance Problem
. ECM (Baro sensor)1'l -86
P1107 (']3)Barometric
Pressure Circuit
Low lnput
ECM (Baro sensor)
TCM
ECM to TCM harness
11-87
P1'108 (13)Ba ro metric
Pressure Circuit
High Input
ECM (Baro sensor)11-41
P1121 \11Throttle Position
Lower Than Expected
. TP sensor
P112211JThrottle Position
H igher Than Expected
'TP sensor
P1 't 28 (5)Manifold Absolute Pressure
Lower Than Expected
. MAP sensor11,57
P1129 (5)Manilold Absolute Pressure
Higher Than Expected
. MAP sensor11-57
P1259 \22)
VTEC System MalfunctionVTEC Solenoid Valve
Open or short in VTEC Solenoid Valve circuit
VTEC Pressure Switch
Open or short in VTEC Pressure Switch circuit
ECM
section 6
P1297 (20)Electrical Load
Detector Circuit
Low Input
Electrical Load Detector
Electrical Load Detector circuit
ECM
11-88
P1298 (20)Electrical Load
Detector Circuit
Hig h Input
Electrical Load Delector
Electrical Load Detector circuit
ECM
11-89
-44