Infiniti Q45 4.1/4.5L (1996 – 2001) OBD1 Codes

Model	Year	Engine identification	System
Q45 4.1/4.SL	1996-01	VH410E/VH450E	ECCS

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) 1 [1], or by the malfunction indicator lamp (MIL).

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

Accessing – Mode 1

Switch ignition ON.
Check MIL illuminates.
Start engine. Allow to idle.
If MIL extinguishes, no trouble codes have been recorded.
If MIL remains illuminated, access trouble codes.

Accessing – Mode 2

Access engine control module (ECM) 1 [3].
Switch ignition ON. Do NOT start engine.
Turn diagnostic mode selector on ECM fully clockwise [2]
Wait at least 2 seconds.
Turn diagnostic mode selector on ECM fully counterclockwise [2].
Self-diagnosis now in Mode 2.
MIL should flash.
Count flashes and compare with trouble code table.
Each trouble code consists of four groups of one or more flashes.
The first group of flashes indicate the ‘thousands’ of the trouble code [3] [A].
The second group of flashes indicate the ‘hundreds’ of the trouble code [3] [B].
The third group of flashes indicate the ‘tens’ of the trouble code [3] [C].
The fourth group of flashes indicate the ‘units’ of the trouble code [3] [D].
Ten flashes in a group indicate ‘0’.
A short pause separates each trouble code group D [E].
A long pause separates each trouble code D [F].
For example: Trouble code P1130 displayed U

Switch ignition OFF.
Self-diagnosis will return to Mode 1.

Erasing

Trouble codes can be erased by using a Scan Tool connected to the data link connector (DLC) or as follows:
With the ignition switch ON and the engine control module (ECM) in diagnosis test mode 2.
Turn diagnostic mode selector on ECM fully clockwise [2]
Trouble codes are erased.
Switch ignition OFF.
Turn diagnostic mode selector on ECM fully counterclockwise [2].
Repeat checking procedure to ensure no data remains in ECM fault memory.

Trouble code identification

Flash code	OBD·II code	Fault location	Probable cause
–	PO, P2, uo	Refer to OBD-11 trouble code tables	–
101	–	Camshaft position (CMP) sensor – circuit malfunction	Wiring, CMP sensor, ECM
102	–	Mass air flow (MAF) sensor – circuit malfunction	Wiring, MAF sensor, ECM
103	–	Engine coolant temperature (ECT) sensor – circuit malfunction	Wiring, ECT sensor, ECM
104	–	Vehicle speed sensor (VSS) – circuit malfunction	Wiring, VSS, ECM
106	P1210	Traction control system – malfunction	Wiring, TP sensor, mechanical fault, ECM
107	–	ABS/TCS communication – circuit malfunction	Wiring, ABS/TCS control module, ECM
110	P1125	Throttle position (TP) sensor 1 & 2 – signal malfunction	Wiring, TP sensor, mechanical fault, ECM
111	P1447	Evaporative emission (EVAP) canister purge control system – malfunction	Wiring, EVAP valve, mechanical fault, ECM
113	P1443	Evaporative emission (EVAP) canister purge control system – circuit malfunction	Wiring, EVAP valve, ECM
114	–	Fuel trim LH – mixture too rich	H02S, fuel pressure, fuel system, mechanical fault, ECM
115	–	Fuel trim LH – mixture too lean	H02S, fuel pressure, fuel system, mechanical fault, ECM
201	P1320	Ignition signal – circuit malfunction	Wiring, ignition control module (ICM), ignition coil
203	–	Closed throttle position (CTP) switch – malfunction	Wiring, CTP switch, mechanical fault, ECM
205	–	Idle control system – malfunction	Wiring, lAC valve, mechanical fault,ECM
208	–	Overheat – circuit malfunction	Wiring, cooling fan, mechanical fault
209	–	Fuel trim RH – mixture too rich	H02S, fuel pressure, fuel system, mechanical fault, ECM
210	–	Fuel trim RH – mixture too lean	H02S, fuel pressure, fuel system, mechanical fault, ECM
212	–	Knock sensor (KS) RH – circuit	Wiring, KS, ECM
213	P1440	Evaporative emission (EVAP) canister purge control system – small leak	EVAP valve, hoses, mechanical fault
214	P1444	Evaporative emission (EVAP) canister purge control system – malfunction	Wiring, EVAP valve, hoses, mechanical fault, ECM
215	P1446	Evaporative emission (EVAP) canister purge control valve – malfunction	Wiring, EVAP valve, mechanical fault, ECM
301	–	Engine control module (ECM) – internal function failure	ECM
302	–	Exhaust gas recirculation (EGR) system – flow excessively high or low	Wiring, EGR solenoid valve, mechanical fault
303	–	Heated oxygen sensor (H02S) – RH front – circuit malfunction	H02S, ECM
304	–	Knock sensor (KS) LH – circuit	Wiring, KS, ECM
305	P1401	Exhaust gas recirculation (EGR) temperature sensor – circuit malfunction	Wiring, EGR temperature sensor, ECM
306	–	Exhaust gas recirculation (EGR) system – excess flow detected	EGR valve, mechanical fault
307	–	Closed loop control LH – inoperative	Wiring, H02S, fuel pressure, fuel system, mechanical fault, ECM
307	P1148	Closed loop control RH – inoperative	Wiring, H02S, fuel pressure, fuel system, mechanical fault, ECM
308	–	Closed loop control RH – inoperative	Wiring, H02S, fuel pressure, fuel system, mechanical fault, ECM
308	P1168	Closed loop control LH – inoperative	Wiring, H02S, fuel pressure, fuel system, mechanical fault, ECM
309	P1448	Evaporative emission (EVAP) canister purge control valve – malfunction	Wiring, EVAP valve, ECM
311	P1491	Evaporative emission (EVAP) canister purge control system – malfunction	Wiring, EVAP valve, ECM
312	P1493	Evaporative emission (EVAP) canister purge control valve – malfunction	Wiring, EVAP valve, ECM
313	–	Heated oxygen sensor (H02S) – RH rear – voltage high	Wiring, H02S, fuel pressure, fuel system, mechanical fault, ECM
314	–	Heated oxygen sensor (H02S)- RH rear- voltage low	Wiring, H025, fuel pressure, fuel system, mechanical fault, ECM
315	–	Heated oxygen sensor (H02S) – RH rear – no activity detected	Wiring, H025, fuel pressure, fuel system, mechanical fault, ECM
401	–	Intake air temperature (IAT) sensor- circuit malfunction	Wiring, IAT sensor, ECM
402	–	Fuel temperature sensor- circuit malfunction	Wiring, temperature sensor, ECM
403	–	Throttle position (TP) sensor 1 – circuit malfunction	Wiring, TP sensor, ECM
404	–	ABS/TCS communication – circuit malfunction	Wiring, ABS/TCS control module, ECM
406	P1120	Throttle position (TP) sensor 2 – circuit malfunction	Wiring, TP sensor, ECM
407	P1335	Crankshaft position (CKP) sensor- circuit malfunction	Wiring, CKP sensor, ECM
409	–	Heated oxygen sensor (H02S) – LH front- slow response	Wiring, H02S, fuel pressure, fuel system, mechanical fault, ECM
410	–	Heated oxygen sensor (H02S) – LH front- voltage high	Wiring, H025, fuel pressure, fuel system, mechanical fault, ECM
411	–	Heated oxygen sensor (H02S) – LH front – voltage low	Wiring, H025, fuel pressure, fuel system, mechanical fault, ECM
412	–	Heated oxygen sensor (H02S) – LH front – no activity detected	Wiring, H025, fuel pressure, fuel system, mechanical fault, ECM
413	–	Heated oxygen sensor (H02S) – RH front – slow response	Wiring, H02S, fuel pressure, fuel system, mechanical fault, ECM
414	–	Heated oxygen sensor (H02S)- RH front- voltage high	Wiring, H025, fuel pressure, fuel system, mechanical fault, ECM
415	–	Heated oxygen sensor (H02S) – RH front – voltage low	Wiring, H025, fuel pressure, fuel system, mechanical fault, ECM
503	–	Heated oxygen sensor (H02S) – LH front – circuit malfunction	Wiring, H02S, ECM
504	–	AT communication – circuit malfunction	Wiring, TCM
505	–	No self-diagnostic failure indicated	–
509	–	Heated oxygen sensor (H02S)- RH front- no activity detected	Wiring, H025, fuel pressure, fuel system, mechanical fault, ECM
510	–	Heated oxygen sensor (H02S) – rear – no activity detected/voltage high	Wiring, H025, fuel pressure, fuel system, mechanical fault, ECM
511	–	Heated oxygen sensor (H02S) – rear- voltage low	Wiring, H025, fuel pressure, fuel system, mechanical fault, ECM
512	–	Heated oxygen sensor (H02S) – LH rear – no activity detected	Wiring, H025, fuel pressure, fuel system, mechanical fault, ECM
514	P1402	Exhaust gas recirculation (EGR) temperature system – malfunction	Wiring, EGR temperature sensor, mechanical fault, ECM
601	–	Cylinder 8 – misfire	Wiring, ignition system, fuel system, fuel pressure, mechanical fault, ECM
602	–	Cylinder 7 – r(lisfire	Wiring, ignition system, fuel system, fuel pressure, mechanical fault, ECM
603	–	Cylinder 6 – misfire	Wiring, ignition system, fuel system, fuel pressure, mechanical fault, ECM
604	–	Cylinder 5 – misfire	Wiring, ignition system, fuel system, fuel pressure, mechanical fault, ECM
605	–	Cylinder 4 – misfire	Wiring, ignition system, fuel system, fuel pressure, mechanical fault, ECM
606	–	Cylinder 3 – misfire	Wiring, ignition system, fuel system, fuel pressure, mechanical fault, ECM
607	–	Cylinder 2 – misfire	Wiring, ignition system, fuel system, fuel pressure, mechanical fault, ECM
608	–	Cylinder 1 – misfire	Wiring, ignition system, fuel system, fuel pressure, mechanical fault, ECM
701	–	Random misfire	Wiring, ignition system, fuel system, EGR valve, fuel pressure, mechanical fault, ECM
702	–	Catalytic converter LH – efficiency below limit	Catalytic converter, rear H025
703	–	Catalytic converter RH – efficiency below limit	Catalytic converter, rear H025
704	–	Evaporative emission (EVAP) canister pressure sensor – malfunction	Wiring, pressure sensor, mechanical fault, ECM
705	–	Evaporative emission (EVAP) canister purge control system – small leak	Wiring, EVAP valve, mechanical fault, ECM
707	–	Heated oxygen sensor (H02S) – rear/ LH rear – circuit malfunction/slow response	Wiring, H02S, ECM
708	–	Heated oxygen sensor (H02S) – RH rear- slow response/circuit malfunction	Wiring, H025, ECM
715	P0455	Evaporative emission (EVAP) system – large leak detected	Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve
801	P1441	Evaporative emission (EVAP) canister purge control system – small leak	Wiring, EVAP valve, mechanical fault, ECM
801	P1490	Evaporative emission (EVAP) canister purge control system – malfunction	Wiring, EVAP valve, mechanical fault, ECM
802	–	Crankshaft position (CKP) sensor – circuit malfunction	Wiring, CKP sensor, ECM
803	–	Manifold absolute pressure (MAP) sensor – circuit malfunction	Wiring, MAP sensor, ECM
804	P1605	AT diagnosis communication – signal failure	Wiring, TCM
805	P1110	Camshaft position (CMP) actuator LH – malfunction	Wiring, CMP actuator, mechanical fault, ECM
807	–	Evaporative emission (EVAP) canister purge control system – circuit malfunction	Wiring, EVAP solenoid, ECM
807	P1492	Evaporative emission (EVAP) canister purge control valve – malfunction	Wiring, EVAP solenoid, ECM
901	–	Heated oxygen sensor (H02S)- LH front – heater circuit malfunction	Wiring, H02S, ECM
902	–	Heated oxygen sensor (H02S) – LH rear- heater circuit malfunction	Wiring, H02S, ECM
903	–	Evaporative emission (EVAP) canister purge control system – circuit malfunction	Wiring, EVAP valve, mechanical fault, ECM
905	P1336	Crankshaft position (CKP) sensor – signal malfunction	Wiring, CKP sensor, ECM
908	–	Insufficient coolant temperature for closed loop fuel control	Wiring, ECT sensor, mechanical fault, ECM
1001	–	Heated oxygen sensor (H02S) – RH front- heater circuit malfunction	Wiring, H02S, ECM
1002	–	Heated oxygen sensor (H02S) – RH rear- heater circuit malfunction	Wiring, H02S, ECM
1003	–	Park/neutral position (PNP) switch – circuit malfunction	Wiring, PNP switch, mechanical fault, ECM
1003	P1706	Park neutral position (PNP) switch – malfunction	Wiring, PNP switch, mechanical fault, ECM
1005	P1400	Exhaust gas recirculation (EGR) valve – voltage incorrect	Wiring, EGR valve, mechanical fault, ECM
1008	–	Evaporative emission (EVAP) canister purge control valve – circuit malfunction	Wiring, EVAP valve
1008	P1445	Evaporative emission (EVAP) canister purge control valve – circuit malfunction	Wiring, EVAP valve, ECM
1101	–	Park/neutral position (PNP) switch – 1998 – circuit	Wiring, PNP switch, mechanical fault, ECM
1102	–	AT- vehicle speed sensor (VSS)	Wiring, VSS, mechanical fault, ECM
1103	–	AT – first gear selection – malfunction	Wiring, mechanical fault
1104	–	AT- second gear selection- malfunction	Wiring, mechanical fault
1105	–	AT -third gear selection – malfunction	Wiring, mechanical fault
1106	–	AT -fourth gear selection – malfunction	Wiring, mechanical fault
1107	–	AT- signal circuit malfunction	Wiring, mechanical fault
1108	–	AT- shift solenoid A – voltage low	Wiring, shift solenoid, mechanical fault
1130	P1130	Intake manifold air control solenoid – malfunction	Wiring, control solenoid, intake system, hose leak/blockage, control vacuum check switch, ECM
1201	–	AT- shift solenoid 8- voltage low	Wiring, shift solenoid, mechanical fault
1203	P1760	AT- overrun clutch solenoid – voltage low	Wiring, solenoid, mechanical fault
1204	–	Torque converter clutch solenoid – voltage low	Wiring, solenoid, mechanical fault
1205	–	AT- line pressure solenoid – voltage low	Wiring, solenoid, mechanical fault
1206	P1705	AT- throttle position (TP) sensor- voltage high or low	Wiring, TP sensor, mechanical fault, ECM
1207	–	Engine speed (RPM) – incorrect voltage signal ECM to AT control module	Wiring, RPM sensor, mechanical fault, ECM
1208	–	Transmission fluid temperature sensor – excessively high or low voltage	Wiring, temperature sensor, mechanical fault, ECM
1301	P1135	Camshaft position (CMP) actuator RH – malfunction	Wiring, CMP actuator, mechanical fault, ECM
1302	P1105	MAP/BARO switching valve – circuit malfunction	Wiring, MAP/BARO switching valve
1303	P1140	Camshaft position (CMP) actuator LH – circuit malfunction	Wiring, CMP actuator, mechanical fault, ECM
1304	P1145	Camshaft position (CMP) actuator RH – circuit malfunction	Wiring, CMP actuator, mechanical fault, ECM
1305	P1220	Fuel pump (FP) control module – circuit malfunction	Wiring, FP control module
1308	P1900	Engine coolant blower motor – circuit	Wiring, blower motor, ECM