Acura OBD/OBD2 Codes >> NSX/NSX-T 3.0/3.2L (1991 – 2005)

ModelYearEngine identificationSystem
NSX/NSX-T 3.0L1991-05C30A1PGM-FI
NSX/NSX-T 3.2L1997-05C32B1PGM-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)-2001 [1] [1]. 2002- [1] [2] or by the malfunction indicator lamp (MIL) with the service check connector jumped [1] [3].
NOTE: The use of a Scan Tool is essential to obtain full diagnostic information.


  • Ensure ignition switched OFF.
  • Jump service check connector terminals [1] [3].
  • 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, erase the trouble codes as follows:
  • Switch ignition OFF.
  • Remove clock fuse No.33 (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
0Engine control module (ECM) –Wiring, ECM
1Heated oxygen sensor (H02S) – front bank, front sensor – circuit/voltage low/highWiring, H02S, fuel system, ECM
2Heated oxygen sensor (H02S) – rear bank, front sensor – circuit/voltage low/highWiring, H02S, ECM
3Manifold absolute pressure (MAP) sensor – circuit/voltage low/highWiring, MAP sensor, ECM
4Crankshaft position (CKP) sensor 1 – range/performance/circuit malfunctionWiring, CKP sensor, valve timing, ECM
5Manifold absolute pressure (MAP) sensor – range/performanceHose 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 – circuit/voltage low/highWiring, ECT sensor, ECM
7Throttle position (TP) sensor – circuit/   voltage low/highWiring, TP sensor, ECM
9P1382Camshaft position (CMP) sensor 1 – signal malfunctionWiring, CMP sensor, ECM
10Intake air temperature (IAT) sensor- circuit/   voltage low/highWiring, 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/performanceECM
13P1107Barometric pressure (BARO) sensor- circuit/voltage lowECM
13P1108Barometric pressure (BARO) sensor- circuit/voltage highECM
14Idle control system – malfunctionIdle speed, throttle body
17Vehicle speed sensor (VSS) – voltage lowWiring, VSS, ECM
22P1279VTEC control system malfunction – front bankWiring, VTEC solenoid/pressure switch, ECM
23Knock sensor (KS) – front bank- circuit malfunctionWiring, KS, ECM
31P1671AT to ECM signal – no signalWiring, TCM, ECM
31P1672AT to ECM signal – signal failureWiring, TCM, ECM
34System voltage – malfunctionWiring, poor connection, battery
35P1676ECM to traction control system signal – no signalWiring, traction control module, ECM
35P1677ECM to traction control system signal – signal failureWiring, traction control module, ECM
37P1246Accelerator pedal position (APP) sensor 1 – circuit malfunctionWiring, APP sensor, ECM
37P1247Accelerator pedal position (APP) sensor 2 – circuit malfunctionWiring, APP sensor, ECM
37P1248Accelerator pedal position (APP) sensor   1 & 2 – incorrect signalsAPP sensor
40P1241Throttle actuator control (TAC) motor- circuit 1 – malfunctionWiring, TAC motor, ECM
40P1242Throttle actuator control (TAC) motor – circuit 2 – malfunctionWiring, TAC motor, ECM
40P1243Throttle position (TP) – insufficientThrottle valve, TP sensor, TAC motor
40P1244Closed throttle position (CTP) – insufficientThrottle valve, TP sensor
41Heated oxygen sensor (H02S) -front bank, front sensor – heater circuit malfunctionWiring, ECM
42Heated oxygen sensor (H02S) – rear bank, front sensor – heater circuit malfunctionWiring, ECM
45Mixture too lean/rich – front bankFuel system, front H02S, MAP sensor, mechanical fault
46Mixture too lean/rich – rear bankFuel system, front H02S, MAP sensor, mechanical fault
52P1259VTEC control system malfunction – rear bankWiring, VTEC solenoid/pressure switch, ECM
53Knock sensor (KS) – rear bank – circuit malfunctionWiring, KS, ECM
54P1336Crankshaft position (CKP) sensor 2 – range/performanceCKP sensor, valve timing
54P1337Crankshaft position (CKP) sensor 2 – circuit malfunctionWiring, CKP sensor, ECM
59P1386Camshaft position (CMP) sensor 2 – intermittent signalCMP sensor
59P1387Camshaft position (CMP) sensor 2 – no signalWiring, CMP sensor, ECM
60Secondary air injection (AIR) system – malfunctionWiring, AIR pump relay, AIR pump, ECM
60P1410Secondary air injection (AIR) system – malfunctionAIR pump
60P1419Secondary air injection (AIR) system – malfunctionAIR pipe(s), ECM
61Heated oxygen sensor (H02S) -front bank, front sensor – slow responseH02S, exhaust system
62Heated oxygen sensor (H02S) -rear bank, front sensor – slow responseH02S, exhaust system
63Heated oxygen sensor (H02S) -front bank, rear sensor – slow response/circuit/voltage low/highWiring, H02S, ECM
64Heated oxygen sensor (H02S) – rear bank, rear sensor – slow response/circuit/voltage low/highWiring, H02S, ECM
65Heated oxygen sensor (H02S) -front bank, rear sensor – heater circuit malfunctionWiring, H02S, ECM
66Heated oxygen sensor (H02S) – rear bank, rear sensor – heater circuit malfunctionWiring, H02S, ECM
67Catalytic converter – front bank – efficiency below limitCatalytic converter, rear H02S
68Catalytic converter – rear bank – 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 (SS) AlB, TCM
70P1705AT – gear shift malfunctionWiring, range position switch, TCM
70P1706AT – gear shift malfunctionWiring, range position switch, TCM
70P1706AT- lock-up clutch malfunctionWiring, range position switch, TCM
70P1709AT- gear selection malfunctionWiring, transmission gear selection switch, ECM
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
70P1768AT – poor gear shiftWiring, linear solenoid, TCM
70P1768AT- lock-up clutch not engagingWiring, linear solenoid, TCM
70P1788AT- poor gear shiftCommunication wire, ECM, TCM
70P1790AT – lock-up clutch not engagingWiring, TP sensor, TCM
70P1791AT- lock-up clutch not engagingWiring, VSS, TCM
70P1792AT- lock-up clutch not engagingWiring, ECT sensor, TCM
70P1793Automatic transmissionWiring, MAP sensor, TCM
70P1795Automatic transmissionWiring, APP sensor, TCM
71P1201Cylinder No.1 – misfireWiring, injector, ignition system, mechanical fault
71P1301Cylinder No.1 – misfireIgnition system
72P1202Cylinder No.2 – misfireWiring, injector, ignition system, mechanical fault
72P1302Cylinder No.2 – misfireIgnition system
73P1203Cylinder No.3 – misfireWiring, injector, ignition system, mechanical fault
73P1303Cylinder No.3 – misfireIgnition system
74P1204Cylinder No.4 – misfireWiring, injector, ignition system, mechanical fault
74P1304Cylinder No.4 – misfireIgnition system
75P1205Cylinder No.5 – misfireWiring, injector, ignition system, mechanical fault
75P1305Cylinder No.5 – misfireIgnition system
76P1206Cylinder No.6 – misfireWiring, injector, ignition system, mechanical fault
76P1306Cylinder No.6 – misfireIgnition system
P1300Random misfireEGR/fuel/ignition system, MAP sensor
79P1316Spark plug voltage detection – front bank – circuit malfunctionWiring, voltage detection module, ECM
79P1317Spark plug voltage detection – rear bank – circuit malfunctionWiring, voltage detection module, ECM
79P1318Spark plug voltage detection module reset – front bank – reset circuit malfunctionWiring, voltage detection module, ECM
79P1319Spark plug voltage detection module reset – rear bank – reset circuit malfunctionWiring, voltage detection module, ECM
80Exhaust gas recirculation (EGR) solenoid – insufficient flowEGR solenoid, hose/pipe leak or blockage
83P1415AIR pump electrical current sensor – open/ short circuitWiring, AIR pump electrical current sensor, ECM
83P1416AIR pump electrical current sensor – open circuitWiring, AIR pump electrical current sensor, ECM
86Engine coolant temperature (ECT) sensor – range/performance problemECT sensor, cooling system
87P1486Thermostat – range/performance problemEngine coolant blower motor, cooling system
90P1456Evaporative emission (EVAP) canister purge system (fuel tank system)- leak detectedHose leak/blockage, 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 leak/blockage, 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 flowEVAP solenoid/flow switch, wiring, throttle body, hose leak/blockage, ECM
92P1459Evaporative emission (EVAP) canister purge system – switch malfunctionWiring, flow switch, hose leak/blockage, ECM
P1109Barometric pressure (BARO) sensor- range/performance problemBARO sensor, ECM
P1607Engine control module (ECM) – internal circuit failure AECM
P1608Engine control module (ECM) – internal circuit failure 8ECM