Honda OBD/OBD2 Codes >> Honda 86-89 Accord 2.0L & 87-91 Civic/CRX & 85-91 Prelude 2.0L

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

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