Acura NSX/NSX-T 3.0/3.2L (1991 – 2005) OBD1 Codes

Model	Year	Engine identification	System
NSX/NSX-T 3.0L	1991-05	C30A1	PGM-FI
NSX/NSX-T 3.2L	1997-05	C32B1	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)-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.

Accessing

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.

Erasing

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 code	OBD-11 code	Fault location	Probable cause
–	PO, P2, uo	Refer to OBD-11 trouble code tables	–
0	–	Engine control module (ECM) –	Wiring, ECM
1	–	Heated oxygen sensor (H02S) – front bank, front sensor – circuit/voltage low/high	Wiring, H02S, fuel system, ECM
2	–	Heated oxygen sensor (H02S) – rear bank, front sensor – circuit/voltage low/high	Wiring, H02S, ECM
3	–	Manifold absolute pressure (MAP) sensor – circuit/voltage low/high	Wiring, MAP sensor, ECM
4	–	Crankshaft position (CKP) sensor 1 – range/performance/circuit malfunction	Wiring, CKP sensor, valve timing, ECM
5	–	Manifold absolute pressure (MAP) sensor – range/performance	Hose leak/blockage, MAP sensor
5	P1128	Manifold absolute pressure (MAP) sensor – pressure lower than expected	MAP sensor
5	P1129	Manifold absolute pressure (MAP) sensor – pressure higher than expected	MAP sensor
6	–	Engine coolant temperature (ECT) sensor – circuit/voltage low/high	Wiring, ECT sensor, ECM
7	–	Throttle position (TP) sensor – circuit/ voltage low/high	Wiring, TP sensor, ECM
9	P1382	Camshaft position (CMP) sensor 1 – signal malfunction	Wiring, CMP sensor, ECM
10	–	Intake air temperature (IAT) sensor- circuit/ voltage low/high	Wiring, IAT sensor, ECM
12	P1491	Exhaust gas recirculation (EGR) system – valve lift insufficient	Wiring, EGR valve/position sensor, EGR solenoid, hose leak/blockage, ECM
12	P1498	Exhaust gas recirculation (EGR) valve position sensor – voltage high	Wiring, EGR valve/position sensor, ECM
13	P1106	Barometric pressure (BARO) sensor – range/performance	ECM
13	P1107	Barometric pressure (BARO) sensor- circuit/voltage low	ECM
13	P1108	Barometric pressure (BARO) sensor- circuit/voltage high	ECM
14	–	Idle control system – malfunction	Idle speed, throttle body
17	–	Vehicle speed sensor (VSS) – voltage low	Wiring, VSS, ECM
22	P1279	VTEC control system malfunction – front bank	Wiring, VTEC solenoid/pressure switch, ECM
23	–	Knock sensor (KS) – front bank- circuit malfunction	Wiring, KS, ECM
31	P1671	AT to ECM signal – no signal	Wiring, TCM, ECM
31	P1672	AT to ECM signal – signal failure	Wiring, TCM, ECM
34	–	System voltage – malfunction	Wiring, poor connection, battery
35	P1676	ECM to traction control system signal – no signal	Wiring, traction control module, ECM
35	P1677	ECM to traction control system signal – signal failure	Wiring, traction control module, ECM
37	P1246	Accelerator pedal position (APP) sensor 1 – circuit malfunction	Wiring, APP sensor, ECM
37	P1247	Accelerator pedal position (APP) sensor 2 – circuit malfunction	Wiring, APP sensor, ECM
37	P1248	Accelerator pedal position (APP) sensor 1 & 2 – incorrect signals	APP sensor
40	P1241	Throttle actuator control (TAC) motor- circuit 1 – malfunction	Wiring, TAC motor, ECM
40	P1242	Throttle actuator control (TAC) motor – circuit 2 – malfunction	Wiring, TAC motor, ECM
40	P1243	Throttle position (TP) – insufficient	Throttle valve, TP sensor, TAC motor
40	P1244	Closed throttle position (CTP) – insufficient	Throttle valve, TP sensor
41	–	Heated oxygen sensor (H02S) -front bank, front sensor – heater circuit malfunction	Wiring, ECM
42	–	Heated oxygen sensor (H02S) – rear bank, front sensor – heater circuit malfunction	Wiring, ECM
45	–	Mixture too lean/rich – front bank	Fuel system, front H02S, MAP sensor, mechanical fault
46	–	Mixture too lean/rich – rear bank	Fuel system, front H02S, MAP sensor, mechanical fault
52	P1259	VTEC control system malfunction – rear bank	Wiring, VTEC solenoid/pressure switch, ECM
53	–	Knock sensor (KS) – rear bank – circuit malfunction	Wiring, KS, ECM
54	P1336	Crankshaft position (CKP) sensor 2 – range/performance	CKP sensor, valve timing
54	P1337	Crankshaft position (CKP) sensor 2 – circuit malfunction	Wiring, CKP sensor, ECM
59	P1386	Camshaft position (CMP) sensor 2 – intermittent signal	CMP sensor
59	P1387	Camshaft position (CMP) sensor 2 – no signal	Wiring, CMP sensor, ECM
60	–	Secondary air injection (AIR) system – malfunction	Wiring, AIR pump relay, AIR pump, ECM
60	P1410	Secondary air injection (AIR) system – malfunction	AIR pump
60	P1419	Secondary air injection (AIR) system – malfunction	AIR pipe(s), ECM
61	–	Heated oxygen sensor (H02S) -front bank, front sensor – slow response	H02S, exhaust system
62	–	Heated oxygen sensor (H02S) -rear bank, front sensor – slow response	H02S, exhaust system
63	–	Heated oxygen sensor (H02S) -front bank, rear sensor – slow response/circuit/voltage low/high	Wiring, H02S, ECM
64	–	Heated oxygen sensor (H02S) – rear bank, rear sensor – slow response/circuit/voltage low/high	Wiring, H02S, ECM
65	–	Heated oxygen sensor (H02S) -front bank, rear sensor – heater circuit malfunction	Wiring, H02S, ECM
66	–	Heated oxygen sensor (H02S) – rear bank, rear sensor – heater circuit malfunction	Wiring, H02S, ECM
67	–	Catalytic converter – front bank – efficiency below limit	Catalytic converter, rear H02S
68	–	Catalytic converter – rear bank – efficiency below limit	Catalytic converter, rear H02S
70	–	AT- lock-up clutch not engaging/no gear shift	Wiring, mainshaft speed sensor, countershaft speed sensor, lock-up control system, shift solenoid (SS) AlB, TCM
70	P1705	AT – gear shift malfunction	Wiring, range position switch, TCM
70	P1706	AT – gear shift malfunction	Wiring, range position switch, TCM
70	P1706	AT- lock-up clutch malfunction	Wiring, range position switch, TCM
70	P1709	AT- gear selection malfunction	Wiring, transmission gear selection switch, ECM
70	P1753	AT – lock-up clutch not engaging/ disengaging	Wiring, lock-up control solenoid A, TCM
70	P1758	AT- lock-up clutch not engaging	Wiring, lock-up control solenoid B, TCM
70	P1768	AT – poor gear shift	Wiring, linear solenoid, TCM
70	P1768	AT- lock-up clutch not engaging	Wiring, linear solenoid, TCM
70	P1788	AT- poor gear shift	Communication wire, ECM, TCM
70	P1790	AT – lock-up clutch not engaging	Wiring, TP sensor, TCM
70	P1791	AT- lock-up clutch not engaging	Wiring, VSS, TCM
70	P1792	AT- lock-up clutch not engaging	Wiring, ECT sensor, TCM
70	P1793	Automatic transmission	Wiring, MAP sensor, TCM
70	P1795	Automatic transmission	Wiring, APP sensor, TCM
71	P1201	Cylinder No.1 – misfire	Wiring, injector, ignition system, mechanical fault
71	P1301	Cylinder No.1 – misfire	Ignition system
72	P1202	Cylinder No.2 – misfire	Wiring, injector, ignition system, mechanical fault
72	P1302	Cylinder No.2 – misfire	Ignition system
73	P1203	Cylinder No.3 – misfire	Wiring, injector, ignition system, mechanical fault
73	P1303	Cylinder No.3 – misfire	Ignition system
74	P1204	Cylinder No.4 – misfire	Wiring, injector, ignition system, mechanical fault
74	P1304	Cylinder No.4 – misfire	Ignition system
75	P1205	Cylinder No.5 – misfire	Wiring, injector, ignition system, mechanical fault
75	P1305	Cylinder No.5 – misfire	Ignition system
76	P1206	Cylinder No.6 – misfire	Wiring, injector, ignition system, mechanical fault
76	P1306	Cylinder No.6 – misfire	Ignition system
–	P1300	Random misfire	EGR/fuel/ignition system, MAP sensor
79	P1316	Spark plug voltage detection – front bank – circuit malfunction	Wiring, voltage detection module, ECM
79	P1317	Spark plug voltage detection – rear bank – circuit malfunction	Wiring, voltage detection module, ECM
79	P1318	Spark plug voltage detection module reset – front bank – reset circuit malfunction	Wiring, voltage detection module, ECM
79	P1319	Spark plug voltage detection module reset – rear bank – reset circuit malfunction	Wiring, voltage detection module, ECM
80	–	Exhaust gas recirculation (EGR) solenoid – insufficient flow	EGR solenoid, hose/pipe leak or blockage
83	P1415	AIR pump electrical current sensor – open/ short circuit	Wiring, AIR pump electrical current sensor, ECM
83	P1416	AIR pump electrical current sensor – open circuit	Wiring, AIR pump electrical current sensor, ECM
86	–	Engine coolant temperature (ECT) sensor – range/performance problem	ECT sensor, cooling system
87	P1486	Thermostat – range/performance problem	Engine coolant blower motor, cooling system
90	P1456	Evaporative emission (EVAP) canister purge system (fuel tank system)- leak detected	Hose leak/blockage, fuel tank/pressure sensor, fuel filler cap, EVAP valve/ bypass solenoid, EVAP two way valve, EVAP canister/vent valve
90	P1457	Evaporative emission (EVAP) canister purge system (canister system)- leak detected	Hose leak/blockage, fuel tank/pressure sensor, EVAP valve/bypass solenoid, EVAP two way valve, EVAP canister/vent valve
91	–	Fuel tank pressure sensor – circuit/voltage low/high	Wiring, pressure sensor, ECM
92	–	Evaporative emission (EVAP) canister purge system – incorrect flow	EVAP solenoid/flow switch, wiring, throttle body, hose leak/blockage, ECM
92	P1459	Evaporative emission (EVAP) canister purge system – switch malfunction	Wiring, flow switch, hose leak/blockage, ECM
–	P1109	Barometric pressure (BARO) sensor- range/performance problem	BARO sensor, ECM
–	P1607	Engine control module (ECM) – internal circuit failure A	ECM
–	P1608	Engine control module (ECM) – internal circuit failure 8	ECM