sensor ACURA INTEGRA 1998 Service Workshop Manual

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),

Secondary Heated Oxygen Sensor (HO2S) {sensor 2l
The scan tool indicates Diagnostic Trouble Code (DTC) P0137: A low voltage problem in the SecondaryHeated Oxygen Sensor (H02S) (Sensor 2) circuit.
(cont'd)
The MIL ha3 been reDorted on.DTC P0137 is storod.
Problem veritication:1. Do the ECM Reset Procedure.2. Start the engine. Hold theengine at 3,000 rpm with noload (in Park or neutral) untilthe radiator fan comes on,3. Check the Secondary H02S(Sensor 2) output voltage at3,000 rpm with the scan 1ool.
Inte.mittent failure, system is OKat lhb time. Ch6ck Ior ooor con-nections or loose wires at C451lSeconddry HO2S {Sensor 2)l andECM.
Does the voltage stay at 0.3 Vor less?
Check for a short in th€ HO2S:1. Turn the ignition switch OFF.2. Discon nect the SecondaryHO2S (Sensor 2) connector.3. Start the engine.4. Check the Secondary H02S(Sensor 2) output whh the scantool.
Does the voltage stay at 0.3 Vor less?
Check tor a short in the wire{SHO2S line):r. I urn rne rgnt on swttch uFF,2. Disconnect the ECM connec,tor D 116P).3. Check for continuity betweenNo. '1 terminal on the Secon-dary HO2S {Sensor 2) connector and body ground.
Ropair short in tho wira bctweenECM (D14) and Secondrry HO2S{Senso.2).
ls there continuity?
Substitute a known-good ECMand recheck. It symptom/indice-taon goes away, replace the origi-nel ECM.
SECONDARYHO2S (Sensor 2l CONNECTOR C451
sHo2sIBLU/REDI f- --
T-l 1 2ltr11(Or ls rl
L
Wire side oI fernale terminals
11-71

PGM-FI System
Secondary Heated Oxygen Sensor (HO2S) (Sensor 2l (cont'd)
The scan tool indicates Diagnostic Trouble Code (DTC) P0138: A high voltage probiem in the Secondary
Heated Oxygen Sensor {HO2Si (Sensor 2) circuit.
YES
The MIL has been reported on.DTC P0138 is stored.
Problem verification:1. Do the ECM Reset Procedure2. Startthe engine. Holdtheengineat 3,000 rpm with no load (in
Park or neutral) untilthe radia'
torfancomeson.3. Check the secondary HO2S(Sensor 2) outPUt vo ltage at
3,000 rpm withthe scan tool.
lntermittent lailur€, svsted i3 OK
at this time. Chock tor Poor con'
nections or loo3e wires at C451
lSecondary HO2s lsensor 2ll and
ECM,
Does the voltage stay at 0.6 V
ls there 0.6 V or more?
Check for an open in the wite
{s()2S line):1. Turn the ignition switch OFF.2. Connect ECM connector ter-minals D13 and Dl4 with ajumper wire.3. Turn the ignition switch ON (ll).
4. Check the Secondary HO25(Sensor 2) output voltage withthe scan tool,
Repair opsn in the wire b€tweonECM {D14 or O13} and SecondaryHO2S {Sensor2).ls there 0,6 V or more?
Substitute a known-good ECMend r6check. It symptom/indica-tion goes away, rcplace the origi-nal ECM.
tI
t$
ffi
tljl'l
t,
lfi
il
fl'I
Check for an open in the HO2S:1. TLrrn the ignition switch OFF.2. Disconnect the SecondaryH02S (Sensor 2) connector.
3. Connect the Secondary HO2S(Sensor 2) 4P connector ter_
minals No. 1 and No.2 with ajumper wire.4. Turn the ignition switch ON (ll).
5. Check the Secondary HO25(Sensor 2) output vo lta ge
with the scan tool.
SECONDAFY HO2S {Sensor 2l CONNECTOR C451
sHo2sIBLU/REDIsHo2s GNOIONN/BLUI
Wire side of female terminals
ECM CONNECTOR D I16P}
sHo2sGND{ORN/BLUI
sHo2sIBLU/RED)
Wire side of female terminals
JUMPER WIRE
i 11-72L

The scan tool indicates Diagnostic Trouble Code (DTC) P0139: A slow response problem in the SeconoarvHeated Oxygen Sensor (H02S) (Sensor 2) circuit.
The MIL has boen reDorted on.DTC P0139 b sto.od.
P.oblem ve tication:1. Do the ECM Reset Procedure.2. Start the engine. Hotd theengine at 3,000 rpm with noload (in Park or neutral) untilthe radiator fan comes on,3. Check the Secondary HO2S{Sensor 2) output ar 3,000 rpmth the scan tool.
Intarmittert lailurg, systsm i! OKat thi! time. Chsck for Door con-nections o. loose wi.es at C451Secondary HO2S lsonsor 2) .ndECM.
Does the voltage stay within0.3 - 0.6 V tortwo minutos?

PGM-FI System
Heated Oxygen Sensor (HO2S) Heater
The scan tool indicates Diagnostic Trouble code (DTC) P0135: A problem in the Primary Heated oxygen
Sensor lHO2S) (Sensor 'l) Heater circuit
The scan tool indicates Diagnostic Trouble Code (DTC)P0141: A problem in the Secondary Heated Oxygen
Sensor {HO25) {Sensor 2) Heater circuit
Fo13sl
lFol4il
PRIMARY Ho2S (sen3or 1) CONNECToR C113,
SECONDARY HO2S (sensor 2l CONNECTOR Cil51'
Terminal side of male terminals
PRIMARY HO2S (SonSor 1l CONNECTOR Cl13,
SECONDARY HO2S lsan3or 2) CONNECTOR C451r
o2sHTC(BLK/WHT,
GRN/REO'}
IGP{YEL/BLK}lGlr(BLK/YEL)
(To page 11-75)*: P0141
- The MIL has been rePorted on- DTC P0135 and/or P0141 ate
stored.
Probl€m verilication:1. Do the ECM Reset Procedure
2. Start the engine.
lnt€rmitlent failure. 3vslem is OK
at this time. Check for Poo. con'
noction3 o. loose wire ai Cl13(Primary HO2S (S.nsor 1ll. gl51
lSocondary H02S lSensor 2))'
and ECM.
Check for an open or short in tho
HO2S:1. Turn the ignition switch OFF.2. Disconnect the Primary HO2S(Sensor 1) Secondary HO2S
{Sensor 2)'connector,3. At the HO2S side measureresistance between the 4P con-nector No. 3 and No. 4 terminals on the HO2S side.
ls there 10 - 40 0?
Check Ior continuity betweenbody ground and the HO2S 4P
connector lerminals No. 3 andNo.4 individually.
ls there continuity?
Ch€ck for an open or short in thewir63 (lGP, lG1*, O2SHTC lines):1. Turn the ignition switch ON (ll).
2. Measure voltage between No.3 terminal and No. 4 terminalon the harness side of the 4P
ls there batlery vohage?
{1o page 1l-75)Wire side of female terminals

(From page 11-74)
Check tor an op6n in the wire{lGP, lGl* linel:Measure voltage between No. 3terminal and body ground.
Repair open in the wirebetween PGM-Fl mein relayand Pii.nary HO2S {Sonsor 11.Repair open in the wirebetween No. 15 ALTERNATORSP SENSOR 17.5 A) tuse in theund€r-d.sh fuse/rolav box andSecondary HO2S (S€n3or 21.
ls there battery vohage?
Check for an opon in the wh$:1. Turn the ignition switch OFF.2. Reconnect the HO2S connec-tor.3- Disconnect the ECM connectorA (32P).
4. Turn the ignition switch ON 1fl).5. Measure voltage between theECM connector terminals 46or A5* and A10.
Repair open in tha wire betw.enECM {A6 or A5rl and HO2S.ls there 0.1 V or less?
Substitute a known-good ECMand r.chcck. tf 3ymptom/indica-tion goes awey, repl.ce the odgi-nelECM.
PRIMARY HO2S {Sensor 1} CONNECTOR C113SECONDARY HO2S (Sensor 2ICONNECTOR C45tr
Wire side of female terminals
ECM CONNECTOR A I32P)
IGPlG1
so2HTC{GRN/RET
c
4tr
A, 4\'/ | PO2HTC \=/ \ltoRN/BLKt \-T--] \
PGl(BLK)
2a 1f lefil tt12't5t51? t8t92022 23
2526l2823
Wire side of temale terminals
(From page '11-74)
Check fo. a short in the wire(O2SHTC linel:1. Turn the ignition switch OFF.2. Disconnect the ECM connec-tor A (32P).
3. Check for continuity betweenthe ECM connector 46 or A5*termanai and body ground.
Rcpair short in the wire botweenECM IAG or A5*l .nd HO2S.ls there continuity?
Substituto a known-good ECMand recheck. lf symptom/indica-tion goes away, replac€ the origi-nalECM.
3 rl 15 6
15 15 17 lA
*r P0141
11-75

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