1998 HONDA INTEGRA fuel

{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

Primary Heated Oxygen Sensor (HO2S) lsensor 1l
The Heated Oxygen Sensor {HO2S) detects the oxygen content in the exhaust gas and signals the ECM. In operation, theECM receives the signals from the sensor and varies the duration during which fuel is iniected. To stabilize the sensor,soutput, the sensor has an internal heater and the sensor element is coated with a catalyst. The HO2S is installed in TWChousing (818C'1, 818C5 engines) or exhaust pipe B {81881 engine).
ztFcoNtAEI."EMEI'IT
SENSORTERMINALVOLTAGE IV)
HEATERIIEATERTERMINAL
RICH. AIR. * LEANFUELRANO
Thescantool indicates Diagnostic Trouble Code IDTCI PO13l: A low voltage problem in the primary
Heated Oxygen Sensor (HO2S) (Sensor 1) circuit.
- Th6 MIL h.r baan.ago.t.d on.- DTC m131 it 3to..d.
Problcm vcrificrtion:1. Do the ECM Reset Procedure.2. Start the engino. Hold theengane at 3,000 rpm with noload lin Park or neutral) untilth€ radiator Ian cofies on.3. Test-drive with the A,/T in Eposition, M/T in 4th gear.4. Check the Primary flO2S {S€n-sor 1) output voltage with thescan tool during accelerationusing wide open throttle.
Intarmittcnt f.ilur., 3yatam b OK.t thia tima. Ch.ck for poor con.nrctiona or loosa wiraa at C113(Prim.ry HO2S ls.n.or lll rndECM.
Chock the fuel pres6ure (see psge11-'t 18).
{To page 11-68)
(cont'd)
11-67

PGM-FI System
Primary,Heated Oxygen Sensor (HO2S) (Sensor 1) (cont'dl
The scan tool indicates Diagnostic Trouble Code (DTC) P0133: A slow response problem in the Primary
Heated Oxygen Sensor (HO25) (Sensor 1) circuit.
Description
By controlling the airlfuel ratio with a Primary HO2S (Sensor 'l) and a Secondary HO2S (Sensor 2), the deterioration of the
primary HO2S {Sensor 1) can be evaluated by its teedback period. When the feedback period of the HO2S exceeds a cer-
lain value during stable driving conditions, the sensor will be judged as deteriorated.
When deterioration has been detected during two consecutive trips, the MIL comes on and DTC P0133 will be stored
NOTE: ll DTC P013't, P0132 and/or P0'135 are stored at the same time as DTC P0133, troubleshoot those DTCS first, then
troubleshoot DTC P0133.
Possible Cause
. Primary HO2S (sensor 1) Deterioration
o Primary HO2S Heater (sensor 1) Deterioration
. Exhaust system leakage
Troubl€shooting Flowchart
')
litll r
- Tho MIL has boon raDortcd on.- DTC P0133 is storcd.
Problem verificttion:1. Do the ECM Reset Procedure.2. Start the engine. Hold thoengine at 3,000 rpm with noload (in Park or neutral) untilthe radiator fan comes on.3. Connect the SCS service con-
4. Test'drive Lrnder f o llowingconditions.* 55 mph (89 km/h) steadyspeed- NT in E position, M/T in5th gear- Until readiness code com€son
lnt.flnittcnt ftilu... ay3tam ia OKat thb tiinr. Ch.ck fo. poor con-necliona o. looaa wita! al Cll3
lPrim.ry HO2S lscn.or lll lndECM.
ls DTC P0133 indicated?
Roplacs the Primary HO2S lscn-3or 1),

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

Troubleshooting Flowchart
HIGH
- The MIL ha3 been rcoortod on.- OTC P0171 andlor PO'l72.re3tored.
ls the Iuel pressure OK?
ls the fuel pressure too highChock th€ luel p.essure regulator,and tu€l return pipe.Ch€ck the Primary HO2S:1. Start the engine. Hold theengine at 3,000 rpm with noload (in Park or neutral) untilthe radiator lan comes on.2. Check the Primary HO2S{Sensor 1) output with thescan tool.
Chock the tuel pump, fuel feodpipe, fuol fiher, and tuol prcssureregulator.
Does it stay at less than 0.3 Vor more than 0.6 V?Rapl.ce the Primary HO2S {Sen-3or ll.
Check lor a sticking or l€akingEVAP purge control solenoid
With a vacuum pump, apply vacu,um to the EVAP purge controlsolenoid valve.
Does it hold vacuum?
Chock the valvc cl6a.ance3 andadjust it nocessary. lf th. valvocloarance3 are OK, reDlaco thGtuel ini€cto6.
11-77

PGM-FI System
Random Misfire
1T0-500 1 a nd Fo-30ittrrousFF0304-lThB scan tool indicates Diagnostic Trouble Code {DTC) P0300 and some of
P0301 - P0304: Random misfire.
Doscription
Misfir; detection is accomplished by monitoring the crankshaft speed with the crankshaft speed fluciuation sensor which
is attached to the crankshsft.
lf misfiring strong enough to damage the catalyst is detected, the MIL will blink during iho time of its occurrence, and DTC
p0300 and some of DTCS p0301 through P0304 will be stor€d. Then, after misfire has ceased, the MIL will come on.
lf misfiring that increases emissions is detected during two consecutive driving cycles, the MIL will come on, and DTC
PO3O0 and some ot DTCS P0301 through P0304 will be stored
NOTE: lJ some of the DTCS listed below are stored at the same time as a misfire DTC, troubleshoot those DTCS first. then
troubleshoot the misfire DTC.
P0171, P0172: Fuel metering
P0505: ldle Control SYstem
P1361, P1362: TDC sensor
P1381. P1382: CYP sensor
P1508: IAC valve
Possible Cause
. Fuel pump insufficient fuel pressure. amount of flow
. Fuel line clogging, blockage, leakage
. Fuel {ilter clogging
a Fuel pressure regulator stuck open
. Distributormallunction
o lgnition coil wire open, leakage
. lgnition control module malfunction
. Valves carbon deposit
a Compression low
. IAC valve malfunction
. Fast idle thermo valve malfunction
o Fuel does not meet Owner's Manual spec., lackotfu€l
. VTEC system malfunction
Troubleshooting
By test-driving, determine the conditions during which misfire occurs. Depending on these conditions, test in the order
described in the table below.
Fuel
pressure
Distributor
and lgnition
wires
tcMIAC ValveValve
Clearance
wEc
System
11118section 23section 231 1- 100section 6section 6
Only low rpm and
loao@o@@
Only acceleratingo@o
Only high rpm and
loado@@@o
Not specificationo@@@@
NOTE: lf misfire doesn't recur, some possible causes arefuel that doesn't meet owner's manual spec, lackoffuel, carbon
deposits on spark plug, etc.
11-78

Misfire Detected in One Cylinder
I P0301 The scan tool indicates Diagnostic Trouble Code (DTC) PO3O1:Cylinder 1 misfire detected.
[F03021 1;," """n tool indicares Diagnostic Troubte Code (DTC) pO3O2: Cylinder2 misfire detected.
P0303 | ths sssn tool indicates Diagnostic Trouble Code (DTC) PO3O3: Cylinder3 misfire detected.
i P0304 | tne scan tool indicates Diagnostic Trouble code {DTC} PO3O4: Cylinder 4 misfire detected.
Doscription
Misfire detection is accomplished by monitoring the crsnkshaft speed with the crankshaft speed fluctuation sensor whichis attached to the crankshaft.
lf misfiring strong enough to damage the catalyst is detected, the MIL will blink during the time of its occurrence, and DTCP0301, P0302, P0303 or P0304 will be stored. Then, after the m;sfire has ceased, the MIL witt come on.lf misfiring that increases emissions is detected during two consecutive driving cycles, the MIL will come on, and DTCP0301, P0302, P0303 or P0304 will be stored.
NOTE: lf some of the DTCS listed below are stored at the same time as a misfire DTC, troubleshoot those DTCS first, thentroubleshoot the misfi.e DTC.
P0107, P108, P1128,P'1129: MAP sensor
PO171, PO172t Fuel metering
P0505; ldle control system
P1259: WEC System
P1361, P1362: TDC sensor
P138'1, P1382: CYP sensor
P1519: IAC valve
Possibls Caus6
. Fuel injector clogging, fuel leakage, air leakage
. Fuel injector circuit open or shoned. Spark plug carbon deposits, fouling, malfunction. lgnition wires open, leaking
. Distributor malfunction
. Compression low
a Valve clearance out of spec.
(cont'd)
11-79

PGM.FI
Misfire
System
Detected in One Cylinder (cont'd)
)
Troubleshooting Flowchart
ff
i
)
NOTE:.lf there is no freeze data of misliring,just clear the DTC.'lf there is no freeze data of misfiring,test drives under various conditions
The MIL has b6€n reported on.DTC P0301, P0302, P0303 0rP0304 is indicated.
Check the fuel iniector function:Stan the engine, and listen for aclicking sound at the fuel injectorin the problem cylinder.
Check for an open or shon in theharness between ECM and thefUel injector.
Repair open or short in the wiro.
- Replace tho luel inisctor.- Sub3titute a known-goodECM and rach€ck. It symptom/indicrtion 90e3 away, replacethe original ECM.
Problem ve.ification:1. After checking the freeze data,do the ECM Reset Procedure.2. Exchange the spark plug fromthe problem cylinder with oneof another cylinder.3. Connect the SCS service connector.4. Test-drive the car several timesin the range of the treeze data.
(To page 11-81)