Acura OBD/OBD2 Codes >> 3.2CL – MDX 3.5L – RSX 2.0L (2000 – 2006)

ModelYearEngine identificationSystem
MDX 3.5L2000-06J35A3/5PGM-FI
RSX 2.0L2002-06K20A2/3PGM-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.


  • 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 codeOBD-11 codeFault locationProbable cause
PO, P2, uoRefer to OBD-11 trouble code tables
1Heated oxygen sensor (H02S) – front – circuit/voltage high/lowWiring short/open circuit, H025, 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 – circuit/voltage low/highWiring short/open circuit, ECT sensor, ECM
7Throttle position (TP) sensor – circuit/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 disconnection. Wiring
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 8 – voltage lowWiring, TCM, ECM
31P1687AT to ECM – signal 8 – voltage highWiring, TCM, ECM
34P1549Generator system – high voltageWiring, generator, ECM
35P1676ABS/TCS control module – communication malfunctionWiring, ABS/TCS control module, ECM
35P1678A8SffCS control module – communication malfunctionWiring, ABSffCS control module, ECM
37P1656Electronic stability programme (ESP) control module – communication malfunctionWiring, ESP control module
40P1683Throttle motor – default position spring performance problemWiring, throttle sticking/mechanically damaged, throttle motor
40P1684Throttle motor – return spring performance problemWiring, throttle sticking/mechanically damaged, throttle motor
41Heated oxygen sensor (H02S) – front – circuit malfunctionWiring, ECM
41P1166Heated oxygen sensor (H02S) 1 – RSX – heater circuit malfunctionWiring, H02S, ECM
41P1167Heated oxygen sensor (H02S) 1 – RSX – heater system malfunctionWiring, H02S, ECM
45Mixture too lean/richFuel system, front H025, MAP sensor, mechanical fault
48P1157Heated oxygen sensor (H02S) 1 – RSX – circuit malfunction ·Wiring, H02S, ECM
48P1162Heated oxygen sensor (H02S) – 1 – RSX – circuit malfunctionWiring, H02S, ECM
54P1336Crankshaft position (CKP) sensor 2 – intermittent signalCKP sensor
54P1337Crankshaft position (CKP) sensor 2 – no signalWiring, CKP sensor, ECM
56P1009Camshaft position (CMP), intake/left/front, bank 1 – circuit malfunction/timing   over-advanced/system performanceWiring, valve timing, engine mechanical fault, CMP actuator, 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 responseH02S, exhaust system
61P1163Heated oxygen sensor (H02S)- 1 – RSX- slow responseH025
61P1164Heated oxygen sensor (H02S)- 1 – RSX- range/performance problemWiring, H025, ECM
61P1172 [1]Heated oxygen sensor (H02S) 1 – circuit malfunctionWiring, H025, ECM
63Heated oxygen sensor (H02S) – rear- slow response/circuiUvoltage low/highWiring, H025, ECM
63P1710AT- 2004-06 MDX- 1st gear hold switchWiring, range position switch, detent bracket/plunger/spring, ECM
65Heated oxygen sensor (H02S) – rear – circuit malfunctionWiring, ECM
67Catalytic converter – efficiency below limitCatalytic converter, rear H025
70AT- lock-up clutch not engaging/no gear shiftWiring, mainshaft speed sensor, countershaft speed sensor, lock-up control system, shift solenoid (55) AlB, TCM
70P1656Electronic stability programme (ESP) control module – communication malfunctionWiring, ESP control module
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
70P1709AT- gear selection malfunctionWiring, transmission gear selection switch, detent bracket, detent plunger/spring, ECM
70P1710AT – 1st gear hold switchWiring, range position switch, detent bracket/ plunger/spring, ECM
70P1717AT – gear selection malfunctionWiring, range position switch, ECM
70P1739AT- 3rd clutch pressure switchWiring, range position switch, 3rd clutch pressure switch, ECM
70P1740AT – 4th clutch pressure switchWiring, range position switch, 4th clutch pressure switch, ECM
70P1750AT- hydraulic system mechanical malfunctionWiring, shift solenoids, ECM, transmission mechanical fault
70P1751AT – hydraulic system mechanical malfunctionWiring, shift solenoids, ECM, transmission mechanical fault
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
70P1768Shift solenoid (SS) AWiring, shift solenoid, ECM
70P1773Shift solenoid (SS) BWiring, shift solenoid, ECM
70P1778Shift solenoid (SS) CWiring, shift solenoid, ECM
70P1786AT – 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
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
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
91P1454Fuel tank pressure sensor – range/performance problemWiring, hose, fuel tank pressure sensor, fuel filler cap, EVAP canister/vent valve, ECM
92Evaporative emission (EVAP) canister purge system – incorrect flowWiring, EVAP solenoid, hose leak/blockage, ECM
106P1077Intake manifold air control system – high   RPMWiring, intake manifold air control solenoid, ECM
106P1078Intake manifold air control system – low   RPMWiring, intake manifold air control solenoid, ECM
118P1450Evaporative emission (EVAP) two way valve, bypass valve – voltage lowWiring, EVAP two way valve/bypass solenoid, ECM
118P1451Evaporative emission (EVAP) two way valve, bypass valve – voltage highWiring, EVAP two way valve/bypass solenoid, ECM
121P1460Fuel gauge tank sensor – supply circuitWiring, tank sensor, ECM
P1109Barometric pressure (BARO) sensor- range/performance problemBARO sensor, ECM
P1116Engine coolant temperature (ECT) sensor – range/performance problemWiring, ECT sensor, ECM
P1172Heated oxygen sensor (H02S) – rear – circuit malfunctionWiring, H02S, ECM
P1174Heated oxygen sensor (H02S) – front- circuit malfunctionWiring, H02S, ECM
P1300Random misfireFuel/ignition system, MAP sensor, lAC valve
P1399Random misfireFuel/ignition system, MAP sensor, lAC valve
P16BBGenerator system – low voltageWiring, generator, ECM
P16BCGenerator system – low voltageWiring, generator, ECM
P1607Engine control module (ECM) – internal circuit failureECM