Honda OBD/OBD2 Codes >> Prelude 2.2/2.3L (1996 – 2002)

ModelYearEngine identificationSystem
Prelude 2.2L1996-02F22A1/H22A1/H22A4PGM-FI
Prelude 2.3L1996H23A1PGM-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) 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.
NOTE: If a trouble code is displayed but not listed in the trouble code table, suspect engine control module (ECM) fault.
  • Switch ignition OFF.
  • Remove jump lead.


  • After the faults have been rectified, erase the 3 3 trouble codes as follows:
  • Switch ignition OFF.
  • Remove clock/radio fuse No.43 (10A) 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 OBD-11 trouble code tables
1Heated oxygen sensor (H02S) – front – circuit/voltage low/highWiring open/short circuit, H025, fuel system, ECM
3Manifold absolute pressure (MAP) sensor – circuit/voltage high/lowWiring, MAP sensor, ECM
4Crankshaft position (CKP) sensor- circuit malfunction/range/performance problemWiring, CKP sensor, valve timing, ECM
5Manifold absolute pressure (MAP) sensor – range/performance problemHose leak, 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 – circuiUvoltage low/highWiring short/open circuit, ECT sensor, ECM
7Throttle position (TP) sensor – circuiU   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 disconnectionWiring
8P1361Crankshaft position (CKP) sensor – intermittent signalCKP sensor
8P1362Crankshaft position (CKP) sensor – 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 – circuiU   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- circuiUvoltage lowECM
13P1108Barometric pressure (BARO) sensor – circuiUvoltage highECM
14Idle 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 malfunction/range/performance problemWiring, VSS, ECM
20P1297Electrical load sensor – circuiUvoltage 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
30P1655AT – signal failureCommunication wire, ECM
41Heated oxygen sensor (H02S) – front – circuit malfunctionWiring, ECM
45Mixture too lean/richFuel system, front H02S, injectors, MAP   sensor, wiring, mechanical fault
61Heated oxygen sensor (H02S) -front – slow responseH02S, exhaust system
63Heated oxygen sensor (H02S) – rear – slow response/circuit/voltage low/highWiring, 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) AlBIC, 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
70P1709AT – Sport shift mode malfunctionWiring, mode switch, TCM
70P1738Automatic transmissionWiring, clutch pressure switch 2, TCM
70P1753AT – lock-up clutch not engagingWiring, lock-up control solenoid, TCM
70P1753AT – no gear shiftWiring, shift control solenoid A, TCM
70P1768AT – no gear shiftWiring, clutch pressure control solenoid   A, TCM
70P1773AT- no gear shiftClutch 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 – misfireFuel/ignition/EGR system, injector, wiring, mechanical fault
72Cylinder No.2 – misfireFuel/ignition/EGR system, injector, wiring, mechanical fault
73Cylinder No.3 – misfireFuel/ignition/EGR system, injector, wiring, mechanical fault
74Cylinder No.4 – misfireFuel/ignition/EGR system, injector, wiring, mechanical fault
P1300Random misfirelgnition/fuei/EGR system, 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 – circuit/voltage low/highHose leak/blockage, wiring, pressure sensor, ECM
92Evaporative emission (EVAP) canister purge system – incorrect flowWiring, EVAP solenoid/flow switch, throttle body, hose leak/blockage, ECM
92P1459Evaporative emission (EVAP) canister purge system – switch malfunctionWiring, EVAP flow switch, hose leak/   blockage, ECM
P1607Engine control module (ECM) – internal circuit failureECM