Acura OBD/OBD2 Codes >> Integra 1.8L / 1.8L VTEC (1996 – 2001)

ModelYearEngine identificationSystem
Integra 1.8L1996-01B18B1  PGM-FI
Integra 1.8L VTEC1996-01B18C1/C5  PGM-FI

General information

  • Engine control module (ECM) incorporates self-diagnosis function.
  • Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
  • ECM operates in backup mode if sensors fail, to enable vehicle to be driven to workshop.
  • Trouble codes can be displayed by using a Scan Tool connected to the data link connector (DLC) by the malfunction indicator lamp (MIL) with the service check connector jumped [1].

NOTE: The use of a Scan Tool is essential to obtain full diagnostic information.


  • Ensure ignition switched OFF.
  • Jump service check connector terminals [1] [2].
  • Switch ignition ON.
  • Check MIL is flashing.
  • Trouble codes 1-9 are indicated as follows:
o Individual short flashes display trouble code [2] [A].
o A short pause separates each flash [2] [B].
o A long pause separates each trouble code [2] [C].
o For example: Trouble code 3 displayed [2].
  • Trouble codes greater than 9 are indicated as follows:
o Long flashes indicate the ‘tens’ of the trouble code [3] [A].
o Short flashes indicate the ‘units’ of the trouble code [3] [C].
o A short pause separates each flash [3] [B].
o A long pause separates each trouble code [3] [D].
o For example: Trouble code 12 displayed [3].
  • Count MIL flashes and compare with trouble code table.
  • Switch ignition OFF.
  • Remove jump lead.


  • After the faults have been rectified, trouble codes can be erased by using a Scan Tool connected to the data link connector (DLC) or as follows:
  • Switch ignition OFF.
  • Remove radio fuse (7.5A) from underhood fusebox for 10 seconds minimum [4].
  • Reinstall fuse.
  • Repeat checking procedure to ensure no data remains in ECM fault memory

Trouble code  identification

Flash codeOBD-11 codeFault locationProbable cause
PO, P2, uoRefer to OBD-11 trouble code tables
1Heated oxygen sensor (H02S) – front – circuiUvoltage high/lowWiring short/open circuit, H02S, fuel system, ECM
3Manifold absolute pressure (MAP) sensor – circuit/voltage low/highWiring, MAP sensor, ECM
4Crankshaft position (CKP) sensor – circuit malfunction/range/performance problemWiring, CKP sensor, ECM
5Manifold absolute pressure (MAP) sensor – range/performance problemHose leak/blockage, MAP sensor
5P1128Manifold absolute pressure (MAP) sensor – pressure lower than expectedMAP sensor
5P1129Manifold absolute pressure (MAP) sensor – pressure higher than expectedMAP sensor
6Engine coolant temperature (ECT) sensor – circuiUvoltage low/highWiring short/open circuit, ECT sensor, ECM
7Throttle position (TP) sensor – circuiU   voltage low/highWiring, TP sensor, ECM
7P1121Throttle position (TP) sensor – position lower than expectedTP sensor
7P1122Throttle position (TP) sensor – position higher than expectedTP sensor
8P1359Crankshaft position (CKP) sensor – connector disconnectionWiring
8P1361Crankshaft position (CKP) sensor 1 – intermittent signalCKP sensor
8P1362Crankshaft position (CKP) sensor 1 – no signalWiring, CKP sensor, ECM
9P1381Camshaft position (CMP) sensor – intermittent signalCMP sensor
9P1382Camshaft position (CMP) sensor – no signalWiring, CMP sensor, ECM
10Intake air temperature (IAT) sensor- circuit/   voltage low/highWiring short/open circuit, IAT sensor, ECM
12P1491Exhaust gas recirculation (EGR) system – valve lift insufficientWiring, EGR valve/position sensor, EGR   solenoid, hose leak/blockage, ECM
12P1498Exhaust gas recirculation (EGR) valve position·sensor – voltage highWiring, EGR valve/position sensor, ECM
13P1106Barometric pressure (BARO) sensor- range/performance problemECM
13P1107Barometric pressure (BARO) sensor- circuit/voltage lowWiring, TCM, ECM
13P1108Barometric pressure (BARO) sensor- circuit/voltage highECM
14P1519Idle control system – malfunctionlAC valve, fast idle thermo valve, throttle body
14P1508Idle air control (lAC) valve – circuit failureWiring, lAC valve, ECM
17Vehicle speed sensor (VSS)- circuit malfunctionWiring, VSS, ECM
20P1297Electrical load sensor – circuit/voltage lowWiring, electrical load sensor, ECM
20P1298Electrical load sensor – circuit/voltage highWiring, electrical load sensor, ECM
22P1259VTEC system malfunctionWiring, VTEC solenoid/pressure switch, ECM
23Knock sensor (KS) – circuit malfunctionWiring, KS, ECM
30P1681AT to ECM – signal A- voltage lowWiring, TCM, ECM
30P1682AT to ECM – signal A- voltage highWiring, TCM, ECM
31P1686AT to ECM – signal B – voltage lowWiring, TCM, ECM
31P1687AT to ECM – signal B – voltage highWiring, TCM, ECM
35P1676ABS/TCS control module – communication malfunctionWiring, ABS/TCS control module, ECM
35P1678ABS/TCS control module – communication malfunctionWiring, ABS/TCS control module, ECM
41Heated oxygen sensor (H02S) – front – circuit malfunctionWiring, ECM
41P1166Air fuel (A/F) sensor 1 – heater circuit malfunctionWiring, A/F sensor, ECM
41P1167Air fuel (AJF) sensor 1 – heater system malfunctionWiring, AJF sensor, ECM
45Mixture too lean/richFuel system, front H02S, MAP sensor, mechanical fault
48P1162Air fuel (AJF) sensor 1 – circuit malfunctionWiring, AIF sensor, ECM
54P1336Crankshaft position (CKP) sensor 2 – intermittent signalCKP sensor
54P1337Crankshaft position (CKP) sensor 2 – no signalWiring, CKP sensor, ECM
58P1366Crankshaft position (CKP) sensor 2 – intermittent signalCKP sensor
58P1367Crankshaft position (CKP) sensor 2 – no signalWiring, CKP sensor, ECM
61Heated oxygen sensor (H02S) – front- slow responseH025, exhaust system
61P1163Air fuel (A/F) sensor 1 – slow responseAIF sensor
61P1164Air fuel (A/F) sensor 1 – range/performance problemWiring, A/F sensor, ECM
63Heated oxygen sensor (H02S) – rear- slow response/circuit/voltage low/highWiring, H025, ECM
65Heated oxygen sensor (H02S) – rear- circuit malfunctionWiring, ECM
67Catalytic converter – efficiency below limitCatalytic converter, rear H02S
70AT- lock-up clutch not engaging/no gear shiftWiring, mainshaft speed sensor, countershaft speed sensor, lock-up control system, shift solenoid (55) AlB, TCM
70P1660AT to ECM – signal failureWiring, TCM, ECM
70P1705AT- gear shift malfunctionWiring, range position switch, TCM
70P1705AT – lock-up clutch not engagingWiring, range position switch, TCM
70P1706AT- gear shift malfunctionWiring, range position switch, TCM
70P1706AT- lock-up clutch malfunctionWiring, range position switch, TCM
70P1753AT – lock-up clutch not engaging/   disengagingWiring, lock-up control solenoid A, TCM
70P1758AT- lock-up clutch not engagingWiring, lock-up control solenoid B, TCM
70P1786AT- poor gear shiftCommunication wire, ECM, TCM
70P1790AT- lock-p clutch not engagingWiring, TP sensor, TCM
70P1791AT – lock-up clutch not engagingWiring, VS5, TCM
70P1792AT – lock-up clutch not engagingWiring, ECT sensor, TCM
70P1794Automatic transmission – BARO signalWiring, ECM, TCM
71Cylinder No.1 – misfireWiring, injector, ignition system, mechanical fault
72Cylinder No.2 – misfireWiring, injector, ignition system, mechanical fault
73Cylinder No.3 – misfireWiring, injector, ignition system, mechanical fault
74Cylinder No.4 – misfireWiring, injector, ignition system, mechanical fault
P1300Random misfireFuel/ignition system, MAP sensor, lAC valve
P1399Random misfireFuel/ignition system, MAP sensor, lAC valve
86Engine coolant temperature (ECT) sensor – range/performance problemECT sensor, cooling system
90P1456Evaporative emission (EVAP) canister purge system (fuel tank system) – leak detectedHose, fuel tank/pressure sensor, fuel filler cap, EVAP valve/bypass solenoid, EVAP two way valve, EVAP canister/vent valve
90P1457Evaporative emission (EVAP) canister purge system (canister system)- leak detectedHose, fuel tank/pressure sensor, EVAP valve/bypass solenoid, EVAP two way valve, EVAP canister/vent valve
91Fuel tank pressure sensor- circuit/voltage low/highWiring, pressure sensor, ECM
92Evaporative emission (EVAP) canister purge system – incorrect flowWiring, EVAP solenoid, hose leak/   blockage, ECM
P1607Engine control module (ECM) – internal circuit failureECM
106P1077Intake manifold air control system – low   RPM malfunctionWiring, intake manifold air control solenoid, ECM
106P1078Intake manifold air control system – high   RPM malfunctionWiring, intake manifold air control solenoid, ECM