Honda Prelude 2.2/2.3L (1996 – 2002) OBD1 Codes

Model	Year	Engine identification	System
Prelude 2.2L	1996-02	F22A1/H22A1/H22A4	PGM-FI
Prelude 2.3L	1996	H23A1	PGM-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.

Accessing

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.

Erasing

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 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 low/high	Wiring open/short circuit, H025, fuel system, ECM
3	–	Manifold absolute pressure (MAP) sensor – circuit/voltage high/low	Wiring, MAP sensor, ECM
4	–	Crankshaft position (CKP) sensor- circuit malfunction/range/performance problem	Wiring, CKP sensor, valve timing, ECM
5	–	Manifold absolute pressure (MAP) sensor – range/performance problem	Hose leak, 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 – circuiUvoltage low/high	Wiring short/open circuit, ECT sensor, ECM
7	–	Throttle position (TP) sensor – circuiU 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 – intermittent signal	CKP sensor
8	P1362	Crankshaft position (CKP) sensor – 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 – circuiU 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- circuiUvoltage low	ECM
13	P1108	Barometric pressure (BARO) sensor – circuiUvoltage high	ECM
14	–	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/range/performance problem	Wiring, VSS, ECM
20	P1297	Electrical load sensor – circuiUvoltage 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	P1655	AT – signal failure	Communication wire, ECM
41	–	Heated oxygen sensor (H02S) – front – circuit malfunction	Wiring, ECM
45	–	Mixture too lean/rich	Fuel system, front H02S, injectors, MAP sensor, wiring, mechanical fault
61	–	Heated oxygen sensor (H02S) -front – slow response	H02S, exhaust system
63	–	Heated oxygen sensor (H02S) – rear – slow response/circuit/voltage low/high	Wiring, H02S, ECM
65	–	Heated oxygen sensor (H02S) – rear – circuit malfunction	Wiring, ECM
67	–	Catalytic converter – efficiency below limit	Catalytic converter, rear H02S
70	–	AT- lock-up clutch not engaging/no gear shift	Wiring, mainshaft speed sensor, countershaft speed sensor, lock-up control system, shift solenoid (SS) AlBIC, TCM
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 – Sport shift mode malfunction	Wiring, mode switch, TCM
70	P1738	Automatic transmission	Wiring, clutch pressure switch 2, TCM
70	P1753	AT – lock-up clutch not engaging	Wiring, lock-up control solenoid, TCM
70	P1753	AT – no gear shift	Wiring, shift control solenoid A, TCM
70	P1768	AT – no gear shift	Wiring, clutch pressure control solenoid A, TCM
70	P1773	AT- no gear shift	Clutch pressure control solenoid B, TCM
70	P1790	AT – lock-up clutch not engaging	Wiring, TP sensor, TCM
70	P1791	AT – lock-up clutch not engaging	Wiring, VSS, TCM
71	–	Cylinder No.1 – misfire	Fuel/ignition/EGR system, injector, wiring, mechanical fault
72	–	Cylinder No.2 – misfire	Fuel/ignition/EGR system, injector, wiring, mechanical fault
73	–	Cylinder No.3 – misfire	Fuel/ignition/EGR system, injector, wiring, mechanical fault
74	–	Cylinder No.4 – misfire	Fuel/ignition/EGR system, injector, wiring, mechanical fault
–	P1300	Random misfire	lgnition/fuei/EGR system, lAC valve
80	–	Exhaust gas recirculation (EGR) solenoid – insufficient flow	EGR valve, hose leak/blockage
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	Hose leak/blockage, wiring, pressure sensor, ECM
92	–	Evaporative emission (EVAP) canister purge system – incorrect flow	Wiring, EVAP solenoid/flow switch, throttle body, hose leak/blockage, ECM
92	P1459	Evaporative emission (EVAP) canister purge system – switch malfunction	Wiring, EVAP flow switch, hose leak/ blockage, ECM
–	P1607	Engine control module (ECM) – internal circuit failure	ECM