Acura OBD/OBD2 Codes >> 3.0CL (1997 – 1999)

ModelYearEngine identificationSystem

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 be displayed by using a Scan Tool connected to the data link connector (DLC) 1 [1] or by the malfunction indicator lamp (MIL) with the service check connector jumped [1] [2].

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


  • Ensure ignition switched OFF.
  • Jump service check connector terminals [1] [2].
  • 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, trouble codes can be erased by using a Scan Tool connected to the data link connector (DLC) or as follows:
  • Switch ignition OFF
  • Remove fuse No.39 (7.5A- Radio) 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 080-11 trouble code. tables
1Heated oxygen sensor (H02S) -front- circuit/voltage low/highWiring, H02S, fuel system, ECM
3Manifold absolute pressure (MAP) sensor – circuit/voltage low/highWiring, MAP sensor, ECM
4Crankshaft position (CKP) sensor – range/   performance problem/circuit malfunctionWiring, CKP sensor, valve timing, ECM
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
7P1121Throttle position (TP) sensor – position lower than expectedTP sensor
7P1122Throttle position (TP) sensor – position higher than expectedTP sensot
8P1361Camshaft position (CMP) sensor 1 – intermittent signalCMP sensor
8P1362Camshaft position (CMP) sensor 1 – no signalWiring, CMP sensor, ECM
10Intake air temperature (IAT) sensor- range/   performance problem/circuit/voltage low/highWiring, IAT sensor, ECM
12P1491Exhaust gas recirculation (EGR) system – valve lift insufficientWiring, EGR valve/lift sensor, EGR   solenoid, hose leak/blockage, ECM
12P1498Exhaust gas recirculation (EGR) valve position sensor – voltage highWiring, EGR valve/lift sensor, ECM
13P1106Barometric pressure (BARO) sensor – range/performance problemECM
13P1107Barometric pressure (BARO) sensor- circuit/voltage lowECM
13P1108Barometric pressure (BARO) sensor- circuit/voltage highECM
14Idle control system – malfunctionlAC valve, fast idle thermo valve, throttle body
14P1519Idle 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
30P1655AT – signal failureCommunication wire, ECM
41Heated oxygen sensor (H02S) – front- circuit malfunctionWiring, ECM
45Mixture too lean/richFuel/exhaust system, front H02S, MAP   sensor, mechanical fault
58P1366Camshaft position (CMP) sensor 2 – intermittent signalCMP sensor
58P1367Camshaft position (CMP) sensor 2 – no signalWiring, CMP sensor, ECM
61Heated oxygen sensor (H02S) – front – slow responseH02S, exhaust system
63Heated oxygen sensor (H02S)- rear – slow response circuit/voltage high/lowWiring, H02S, ECM
65Heated oxygen sensor (H02S) – rear – circuit malfunctionWiring, ECM
67Catalytic converter – 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
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
70P1738Automatic transmissionWiring, clutch pressure switch 2, TCM
70P1739Automatic transmissionWiring, clutch pressure switch 3, TCM
70P1753AT- lock-up clutch not engaging/disengagingWiring, lock-up control solenoid A, TCM
70P1768AT- no gear shiftWiring, clutch pressure control solenoid  
70P1773AT – poor gear shiftWiring, clutch pressure control solenoid   B, TCM
70P1790AT- lock-up clutch not engagingWiring, TP sensor, TCM
70P1791AT – lock-up clutch not engagingWiring, VSS, TCM
71Cylinder No.1 – misfireWiring, injector, ignition/fueiiEGR system, MAP sensor, lAC valve, mechanical fault
72Cylinder No.2 – misfireWiring, injector, ignition/fueiiEGR system, MAP sensor, lAC valve, mechanical fault
73Cylinder No.3 – misfireWiring, injector, ignition/fuei/EGR system, MAP sensor, lAC valve, mechanical fault
74Cylinder No.4 – misfireWiring, injector, ignition/fueiiEGR system, MAP sensor, lAC valve, mechanical fault
75Cylinder No.5 – misfireWiring, injector, ignition/fueiiEGR system, MAP sensor, lAC valve, mechanical fault
76Cylinder No.6 – misfireWiring, injector, ignition/fueiiEGR system, MAP sensor, lAC valve, mechanical fault
P1300Random misfirelgnition/fueiiEGR system, MAP sensor, lAC valve
80Exhaust gas recirculation (EGR) solenoid – insufficient flowEGR valve, hose leak/blockage
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- circuiUvoltage low/highWiring, pressure sensor, ECM
P1607Engine control module (ECM) – internal circuit failureECM