Acura 3.2CL – MDX 3.5L – RSX 2.0L (2000 – 2006) OBD1 Codes

Model	Year	Engine identification	System
3.2CL	2000-03	J32A1/2	PGM-FI
MDX 3.5L	2000-06	J35A3/5	PGM-FI
RSX 2.0L	2002-06	K20A2/3	PGM-FI

General information

Refer to the front of this manual for general test conditions, terminology, detailed descriptions of wiring faults and a general trouble shooter for electrical and mechanical faults.
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.

Accessing

Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC) [1] – 3.2CL, [2] – MDX or [3] – RSX.

Erasing – 2002

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.
3.2CL- Remove clock/backup fuse (15A) from RH fascia fusebox for 10 seconds minimum [4].
MDX- Remove clock/backup fuse (7.5A) from RH fascia fusebox for 10 seconds minimum [5].
RSX – Remove ECM fuse (15A) from underhood fusebox for 10 seconds minimum [6]
Reinstall fuse.
Repeat checking procedure to ensure no data remains in ECM fault memory.

Erasing – 2003

• Trouble codes can only be erased by using a Scan Tool connected to the data link connector (DLC).

Trouble code identification

Flash code	OBD-11 code	Fault location	Probable cause
–	PO, P2, uo	Refer to OBD-11 trouble code tables	–
1	–	Heated oxygen sensor (H02S) – front – circuit/voltage high/low	Wiring short/open circuit, H025, fuel system, ECM
3	–	Manifold absolute pressure (MAP) sensor – circuit/voltage low/high	Wiring, MAP sensor, ECM
4	–	Crankshaft position (CKP) sensor – circuit malfunction/range/performance problem	Wiring, CKP sensor, ECM
5	–	Manifold absolute pressure (MAP) sensor – range/performance problem	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 short/open circuit, ECT sensor, ECM
7	–	Throttle position (TP) sensor – circuit/voltage low/high	Wiring, TP sensor, ECM
7	P1121	Throttle position (TP) sensor – position lower than expected	TP sensor
7	P1122	Throttle position (TP) sensor – position higher than expected	TP sensor
8	P1359	Crankshaft position (CKP) sensor – connector disconnection	. Wiring
8	P1361	Crankshaft position (CKP) sensor 1 – intermittent signal	CKP sensor
8	P1362	Crankshaft position (CKP) sensor 1 – no signal	Wiring, CKP sensor, ECM
9	P1381	Camshaft position (CMP) sensor – intermittent signal	CMP sensor
9	P1382	Camshaft position (CMP) sensor – no signal	Wiring, CMP sensor, ECM
10	–	Intake air temperature (IAT) sensor- circuit/voltage low/high	Wiring short/open circuit, 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 problem	ECM
13	P1107	Barometric pressure (BARO) sensor- circuit/voltage low	Wiring, TCM, ECM
13	P1108	Barometric pressure (BARO) sensor- circuit/voltage high	ECM
14	P1519	Idle control system – malfunction	lAC valve, fast idle thermo valve, throttle body
14	P1508	Idle air control (lAC) valve – circuit failure	Wiring, lAC valve, ECM
17	–	Vehicle speed sensor (VSS) – circuit malfunction	Wiring, VSS, ECM
20	P1297	Electrical load sensor – circuit/voltage low	Wiring, electrical load sensor, ECM
20	P1298	Electrical load sensor – circuit/voltage high	Wiring, electrical load sensor, ECM
22	P1259	VTEC system malfunction	Wiring, VTEC solenoid/pressure switch, ECM
23	–	Knock sensor (KS) – circuit malfunction	Wiring, KS, ECM
30	P1681	AT to ECM – signal A – voltage low	Wiring, TCM, ECM
30	P1682	AT to ECM – signal A – voltage high	Wiring, TCM, ECM
31	P1686	AT to ECM – signal 8 – voltage low	Wiring, TCM, ECM
31	P1687	AT to ECM – signal 8 – voltage high	Wiring, TCM, ECM
34	P1549	Generator system – high voltage	Wiring, generator, ECM
35	P1676	ABS/TCS control module – communication malfunction	Wiring, ABS/TCS control module, ECM
35	P1678	A8SffCS control module – communication malfunction	Wiring, ABSffCS control module, ECM
37	P1656	Electronic stability programme (ESP) control module – communication malfunction	Wiring, ESP control module
40	P1683	Throttle motor – default position spring performance problem	Wiring, throttle sticking/mechanically damaged, throttle motor
40	P1684	Throttle motor – return spring performance problem	Wiring, throttle sticking/mechanically damaged, throttle motor
41	–	Heated oxygen sensor (H02S) – front – circuit malfunction	Wiring, ECM
41	P1166	Heated oxygen sensor (H02S) 1 – RSX – heater circuit malfunction	Wiring, H02S, ECM
41	P1167	Heated oxygen sensor (H02S) 1 – RSX – heater system malfunction	Wiring, H02S, ECM
45	–	Mixture too lean/rich	Fuel system, front H025, MAP sensor, mechanical fault
48	P1157	Heated oxygen sensor (H02S) 1 – RSX – circuit malfunction ·	Wiring, H02S, ECM
48	P1162	Heated oxygen sensor (H02S) – 1 – RSX – circuit malfunction	Wiring, H02S, ECM
54	P1336	Crankshaft position (CKP) sensor 2 – intermittent signal	CKP sensor
54	P1337	Crankshaft position (CKP) sensor 2 – no signal	Wiring, CKP sensor, ECM
56	P1009	Camshaft position (CMP), intake/left/front, bank 1 – circuit malfunction/timing over-advanced/system performance	Wiring, valve timing, engine mechanical fault, CMP actuator, ECM
58	P1366	Crankshaft position (CKP) sensor 2 – intermittent signal	CKP sensor
58	P1367	Crankshaft position (CKP) sensor 2 – no signal	Wiring, CKP sensor, ECM
61	–	Heated oxygen sensor (H02S) – front – slow response	H02S, exhaust system
61	P1163	Heated oxygen sensor (H02S)- 1 – RSX- slow response	H025
61	P1164	Heated oxygen sensor (H02S)- 1 – RSX- range/performance problem	Wiring, H025, ECM
61	P1172 [1]	Heated oxygen sensor (H02S) 1 – circuit malfunction	Wiring, H025, ECM
63	–	Heated oxygen sensor (H02S) – rear- slow response/circuiUvoltage low/high	Wiring, H025, ECM
63	P1710	AT- 2004-06 MDX- 1st gear hold switch	Wiring, range position switch, detent bracket/plunger/spring, ECM
65	–	Heated oxygen sensor (H02S) – rear – circuit malfunction	Wiring, ECM
67	–	Catalytic converter – efficiency below limit	Catalytic converter, rear H025
70	–	AT- lock-up clutch not engaging/no gear shift	Wiring, mainshaft speed sensor, countershaft speed sensor, lock-up control system, shift solenoid (55) AlB, TCM
70	P1656	Electronic stability programme (ESP) control module – communication malfunction	Wiring, ESP control module
70	P1660	AT to ECM – signal failure	Wiring, TCM, ECM
70	P1705	AT- gear shift malfunction	Wiring, range position switch, TCM
70	P1705	AT – lock-up clutch not engaging	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, detent bracket, detent plunger/spring, ECM
70	P1710	AT – 1st gear hold switch	Wiring, range position switch, detent bracket/ plunger/spring, ECM
70	P1717	AT – gear selection malfunction	Wiring, range position switch, ECM
70	P1739	AT- 3rd clutch pressure switch	Wiring, range position switch, 3rd clutch pressure switch, ECM
70	P1740	AT – 4th clutch pressure switch	Wiring, range position switch, 4th clutch pressure switch, ECM
70	P1750	AT- hydraulic system mechanical malfunction	Wiring, shift solenoids, ECM, transmission mechanical fault
70	P1751	AT – hydraulic system mechanical malfunction	Wiring, shift solenoids, ECM, transmission mechanical fault
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	Shift solenoid (SS) A	Wiring, shift solenoid, ECM
70	P1773	Shift solenoid (SS) B	Wiring, shift solenoid, ECM
70	P1778	Shift solenoid (SS) C	Wiring, shift solenoid, ECM
70	P1786	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	P1794	Automatic transmission – BARO signal	Wiring, ECM, TCM
71	–	Cylinder No.1 – misfire	Wiring, injector, ignition system, mechanical fault
72	–	Cylinder No.2 – misfire	Wiring, injector, ignition system, mechanical fault
73	–	Cylinder No.3 – misfire	Wiring, injector, ignition system, mechanical fault
74	–	Cylinder No.4 – misfire	Wiring, injector, ignition system, mechanical fault
86	–	Engine coolant temperature (ECT) sensor – range/performance problem	ECT sensor, cooling system
90	P1456	Evaporative emission (EVAP) canister purge system (fuel tank system) – leak detected	Hose, 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, 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
91	P1454	Fuel tank pressure sensor – range/performance problem	Wiring, hose, fuel tank pressure sensor, fuel filler cap, EVAP canister/vent valve, ECM
92	–	Evaporative emission (EVAP) canister purge system – incorrect flow	Wiring, EVAP solenoid, hose leak/blockage, ECM
106	P1077	Intake manifold air control system – high RPM	Wiring, intake manifold air control solenoid, ECM
106	P1078	Intake manifold air control system – low RPM	Wiring, intake manifold air control solenoid, ECM
118	P1450	Evaporative emission (EVAP) two way valve, bypass valve – voltage low	Wiring, EVAP two way valve/bypass solenoid, ECM
118	P1451	Evaporative emission (EVAP) two way valve, bypass valve – voltage high	Wiring, EVAP two way valve/bypass solenoid, ECM
121	P1460	Fuel gauge tank sensor – supply circuit	Wiring, tank sensor, ECM
–	P1109	Barometric pressure (BARO) sensor- range/performance problem	BARO sensor, ECM
–	P1116	Engine coolant temperature (ECT) sensor – range/performance problem	Wiring, ECT sensor, ECM
–	P1172	Heated oxygen sensor (H02S) – rear – circuit malfunction	Wiring, H02S, ECM
–	P1174	Heated oxygen sensor (H02S) – front- circuit malfunction	Wiring, H02S, ECM
–	P1300	Random misfire	Fuel/ignition system, MAP sensor, lAC valve
–	P1399	Random misfire	Fuel/ignition system, MAP sensor, lAC valve
–	P16BB	Generator system – low voltage	Wiring, generator, ECM
–	P16BC	Generator system – low voltage	Wiring, generator, ECM
–	P1607	Engine control module (ECM) – internal circuit failure	ECM