1998 HONDA INTEGRA check engine

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
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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,

The MIL has b€en reoorted on.DTC P0117 is stored.
Problem verification:1. Turn the ignition switch ON (ll).2. Check the ECT with the scantool.
Intermittent failure, system is OKat this time. Check for poor con-nections or looso wires at C111(ECT sensorl and ECM.
ls 302'F (150'C) or higher {orH Limit in Honda mode ofPGM Tester) or 0 V indicated?
Check tor a short in tho ECT sen-sor:1. Disconnect the ECT sensor
2. Check the ECT with the scantool.
ls 302'F (150'Ci or higher (orH-Limit in Honda mode olPGM Tester) or 0 V indicated?
Check tor s short in the wires (ECTline):r. r urn Ine rgnrtron swttch uFf,2. Disconnect the ECM connector D (16P).
3. Check lor continuity betweenECT sensor connector termi,nal No. 1 and body ground.
Check tor short in the TCM IECTlinell1, Disconnect the 22P connectorfrom the TCM.2. Check for continuity betweenECT sensor connector terminal No- 2 and body ground.
ls there continuity?
Repair shon in the wire botweenECM lD2). TCM and ECT sensor.
iT,011tl The.scan tool indicates Diagnostic Trouble Code (DTC) P0117:Alowvoltage(hightemperature) probleminthe- Engine Coolant Temperature (ECT) sensor circuit.
ECT SENSOR CONNECTOR IC111}
Wire side of fem6le terminals
Substitute a known-good ECMand recheck. lI normal ECT isindicated, replaco the origindlECM.
(cont'd)
NO
11-61

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I
Ir
PGM.FI
Engine
System
Coolant Temperature (ECTI Sensor (cont'dl
lTo1ig I The.scan tool indicates Diagnostic Trouble Code (DTC) P01 18: A high voltage (low temperature) problem in the.- Engine Coolant Temperature (ECT) sensorcircuit.
ECT SENSOR CONNECTOR (C111)
L
li
li
tllll
tl
fl
ECT{RED/WHT)
sG2{GRN/BLKI
JUMPER WIRE
Wire side o{ lemale terminals
ECM CONNECTOR D {16PI
ECT{RED/WHT)
The MIL has been repo.ted on.DTC P0118 is stor€d.
Problem v€riticetion:1. Turn the ignition switch ON (ll).
2. Check the ECT with the scantool.
Intermittont failure, svstom i3 OKat this time. Check for poor con-noctions or looso wires at C111{ECT sensorl and ECM.
ls -4'F (-20"C) or less (or L-Limitin Honda mode of PGM Tester) or5 V indicated?
Chock tor an opon in the ECT s6n-sor:t. utsconnect tne EL I sensor
2. Install a jumper wire betweenthe two terminals on the harness side of the ECT sensor
3. Check the ECT with the scantool,
ls -4'F (-20"C) or less (or L-Limitin Honda mode of PGM Tested or5 V indicated?
Ch6ck Ior an open in the wiresIECT, SG2lines):1. Turn the ignition switch OFF.2. Install a jumper wire betweenECM conneclor terminals D2and D11.3. Turn the ignition switch ON (ll).4. Check the ECT with the scantool.
ls -4'F {-20'C) or less (or L-Limitin Honda mode ol PGM Tester) or5 V indicated?
Ropair op6n in the wires betwo€nECM lD2, D11) and ECT 3eBor.
Substitute a known-good ECMand recheck. lf normal ECT isindicated, replace the originalECM.
JUMPER WIRE
sG2
r-zlr r5
5e I/ 101t't2
l5
Wire side of female terminals
L

The scan tool indicates Diagnostic Trouble Code (DTC) P0122: A low voltage problem in the Throttle Position{TP) sensor circuil.
The TP Sensor is a potentiometer. lt is connected to the throttle valve shaft. As the throttle position changes, the throttleposition sensor varies the voltage signalto the ECM.
ARUSHHOI.DER
BRUSH 5
FULLTHROTTLE
TP SENSOR CONNECTOR IC115)
Wire side of temale terminals
ECM CONNECTOR D {16P)
(GRN/BLUI
Wire side ot female terminals
sG2 / -\
fr rrr r 'tr\
- 1 2 3)
|{- f- /
| _-,/tlI /6 I TPS-\j/
Terminalside of maletermrnats(To page 11-64)
The MIL has be€n reDort€d on.DTC P0122 is stor€d.
Problem veritication:1. Start the engine. Hold theengine at 3,000 rpm with noload (in Park or neutral) untilthe radiator fan comes on, thenturn the ignition switch OFF.2. Turn the ignition switch ON (ll).
3. Check the throttle positionwith the scan tool.
ls there approx. 10% whenthe throttle is fully closedand approx.90o/o when thethrottle is fully opened?
lntermittenl tailure, system is OKat this time. Check tor poor con-nections or loose wires at Cl15{TP s€nsor) end ECM.
Check lor an open in ihe wire(VCC2line):
1. Turn the ignition switch OFF.2. Disconnect the TP sensor con,nector,3. Turn the ignition switch ON (ll).4. Measure voltage betweenTP sensor connector terminalsNo. l and No. 3.
ls there approx. 5 V7
Check fo. an open in wire IVCC2line):lleasure voltage between ECMconnector terminals D10 and D11.
R.p.ir opon in tho wire betwoenECM {D101 and TP sen3or.ls there approx. 5 V?
Substitute a known-good ECMand recheck. lf pr6sc.ibed volt-age ia now available, replaco theoriginalECM.
Check for an open or 3hort in TP3ensor:1. Turn the ignition switch OFF.2. Measure resistance betweenTP sensor terminals No. '1 andNo.2 with the throttle fullyctoseo,
OUTPUT VOLTAGE {V)
4
RESISTOR3
2
TERMINAL
I
o
THROTTLEOPEI{INGBUS}IINGIDLE
sG2{GRN/BLK)vcc2IYEL/BLU}
vcc2{YEL/BI
l\e
4E
i2iRN,
. llLI5
6/101t 12
t515
(cont'd)

The scan tool indicates Diagnostic Trouble Code (DTC) P0123r A high voltage problem in the Throttle position(TP) sensor circuit,
TP SENSOR CONNECTOR {Cl15I
sG2{GRN/BLK}(YEL/BLU)
Wire side of female terminals
Th€ MIL has been reported on.DTC P0123 is stored.
Problem veriticationl1. Start the engine. Hold theengine at 3,000 rpm whh noload (in Park or neutral) untilthe radiator tan comes on, thenturn the ignition swhch OFF.2. Turn the ignition switch ON (ll).3. Check the throttle positionwith the scan tool.
ls there approx. l0% whenthe throttle is fullyclosedand approx. 90% when thethrottle is fully opened?
Intermittoni {ailure, system is OKal this time. Check tor poor con-nections or loose wires at C115{TP sensor} and ECM.
Check for an open in the TP sen-sot:1. Turn the ignition switch OFF.2. Disconnect the TP sensor con,nectot.3. Turn the ignition switch ON (ll).4. Measure voltage between TPsensor connector terminalsNo.3 and No.'1.
ls there approx. 5 V?
Check for an open in th€ wire(SG2linel:
Measure voltage between ECMconnector terminals Dl0 and 011.
Ropair open in the wir6 betweenECM lD11l and TP sensor.ls there approx. 5 V)
Substitute a known-9ood ECMand rocheck. lf prescribed volt-age is now availablo, roplace theoriginal ECM.
ECM CONNECTOR D I16PI
Wire side of female terminals
(cont'di
1 1-65

- The MIL has been reported on.- DTC P1121 is stored.
Problem verification:1. Turn the ignition switch ON (lli.
2. Check the throttle position
with the scan tool.
ls TP*% or higher indicated whenthe throttle is fully opened?Inte.mittent failure, sy3lem is OKat this time.
[FTl2il Th"r"untool indicates Diag nostic Trouble Code (DTC) P1121: Throttle Position (TP) lowerthan expected.
": 12.9 (M/Ti,
12.2 tA/T)
I P1122 | The scan tool indicates Diagnostic Trouble Code {DTC) P]122: Throftle Position (TP) higher than expected.
*: 17.2 1818C1, 818C5 engines),17.6 (81881 engine M/T),16.5 (81881 engine A,/T)
- The MIL has been reoorted on.- OTC P1122 is stored.
Problem verification:1. Turn the ignition switch ON (ll).
2. Check the throttle positionw;th the scan tool.
ls TP*% or less indicated whenthe throftle is fully closed?Ini€rmiftent failure, system is OKat thi3 tim6.
PGM-FI System
Throttle Position (TP) Sensor {cont'dl
1 1 1-66
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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