Honda Honda 86-89 Accord 2.0L & 87-91 Civic/CRX & 85-91 Prelude 2.0L Trouble Code Info

General Information

  • Trouble codes are displayed by LED in engine control module (ECM)

Accessing Trouble Codes

  • Access engine control module (ECM):
    • Civic/CRX and Prelude (B20A5) Image 1
    • Accord Image 2
    • Prelude (BT/A20A3) Image 3
  • Switch ignition ON.
  • Check ECM LED is flashing.
  • Multiple codes are separated by a 2 second pause
  • Switch ignition OFF
Scan0004 Scan0003   Honda Accord 86-89 Prelude 85-91 CivicCRX 87-91

Clearing Trouble Codes

  • After the faults have been rectified, erase the trouble codes as follows:
  • Ensure ignition switched OFF
  • Prelude 2.0L (BT) – disconnect battery ground cable for 10 seconds minimum
  • Civic/CRX – remove fuse No.34 (10A) from underhood fusebox for 10 seconds minimum
  • Accord (2.0L) – remove fuse No.11 (10A) from underhood fusebox for 10 seconds minimum
  • Prelude 2.0L (A20A3) – remove fuse No.10 (10A) from underhood fusebox for 10 seconds minimum
  • Prelude 2.0L (B20A5) – remove fuse No..35 (10A) from underhood fusebox for 10 seconds minimum
  • Reinstall fuse
  • Repeat accessing procedure to ensure no data remains in ECM fault memory

 Trouble Codes

86-89 Accord 2.0L Engine Code: BT/A20A3

87-91 Civic/CRX 1.5L Engine Code: D15B1/2/6

87-91 Civic/CRX 1.6L Engine Code: D16A6

85-87 Prelude 2.0L Engine Code: BT

87-88 Prelude 2.0L Engine Code: A20A3

88-91 Prelude 2.0L: Engine Code: B20A5

Trouble code Fault location Probable Cause
0 Engine control module (ECM) Wiring, ECM
1 Oxygen sensor (02S) LH or single Fuel system, wiring, 02S, ECM
2 Engine control module 1985-87 Wiring, ECM
2 Oxygen sensor (02S)- RH- 1988-91 Fuel system, wiring, 02S, ECM
3 Manifold absolute pressure (MAP) sensor Wiring, MAP sensor, ECM
4 Crankshaft position (CKP)/engine speed (RPM) sensor 1988-91 Wiring, CKP/RPM sensor, ECM
4 Engine control module – 1985-87 Wiring, ECM
5 Manifold absolute pressure (MAP) sensor Hose leak
6 Engine coolant temperature (ECT) sensor Wiring, ECT sensor, ECM
7 Throttle position (TP) switch/sensor Wiring, TP switch/sensor, ECM
8 Crankshaft position (CKP)/engine speed (RPM) sensor 1 Wiring, CKP/RPM sensor, ECM
9 Crankshaft position (CKP)/engine speed (RPM) sensor 1 – 1985-87 Wiring, CKP/RPM sensor, ECM
9 Camshaft position (CMP) sensor 1 or A – 1988-91 Wiring, CMP sensor, ECM
10 Intake air temperature (IAT) sensor Wiring, lAT sensor, ECM
11 Engine control module (ECM) ECM
12 Exhaust gas recirculation (EGR) system Hose leak/blockage, wiring, EGR valve/ position  sensor, EGR solenoid, ECM
13 Barometric pressure (BARO) sensor Wiring, BARO sensor, ECM
14 Idle air control (lAC) valve Wiring, lAC valve, ECM
15 Ignition output signal Wiring, ignition module, ECM
16 Injectors Wiring, injector, ECM
17 Vehicle speed sensor (VSS) Wiring, VSS, ECM
19 Lock-up control solenoid valve (AT) Wiring, Jock-up control solenoid valve, ECM
20 Electrical load sensor Wiring, electrical load sensor, ECM