Cars made by Honda between years 1990 and 1995 are equipped with the OBD1 computer operating system. If a check engine light is observed, one or more diagnostic trouble codes have been stored on the computer's memory. A diagnostic two terminal blue connector is used to trigger the code display mode which is located on the passenger's side, under dash, near the lower kick panel. Use a jumper wire to connect the two electrical terminals together to initiate the code sequence after the ignition key has been turned to the "ON" position (do not start engine).
Codes are presented by the number of flashes the check engine light produces. The first digit of the code will be defined by long check engine light blinks followed by short blinks as the second number. If there are only long blinks the code is single digit.
For example if the check engine light blinks four long blinks and one short blink the code is 41. To restart the code gathering sequence turn the ignition key "OFF" and then "ON" again. To clear codes after the repair has been made, disconnect the negative battery terminal for thirty seconds and reconnect.
Code 0 and 11 Electronic Control Module (ECM) Computer
Code 1 Heated oxygen sensor A
Code 2 Oxygen content B
Code 3 and 5 Manifold Absolute Pressure
Code 4 Crank position sensor
Code 6 Engine coolant temperature
Code 7 Throttle position sensor
Code 8 Top dead center sensor
Code 9 No.1 cylinder position sensor
Code 10 Intake air temperature sensor
Code 12 Exhaust re-circulation system
Code 13 Barometric pressure sensor
Code 14 Idle air control valve or bad ECM
Code 15 Ignition output signal
Code 16 Fuel Injector
Code 17 Vehicle speed sensor
Code 19 A/T lock-up control solenoid
Code 20 Electric load detector
Code 21 V-TEC control solenoid
Code 22 V-TEC pressure solenoid
Code 23 Knock sensor
Code 30 A/T FI signal A
Code 30 A/T FI signal B
Code 41 Heated oxygen sensor heater
Code 43 Fuel supply system
Code 45 Fuel supply metering
Code 48 Heated oxygen sensor
Code 61 Front heated oxygen sensor
Code 63 Rear heated oxygen sensor
Code 65 Rear heated oxygen sensor heater
Code 67 Catalytic converter system
Code 70 Automatic trans-axle
Code 71 Misfire detected cylinder 1
Code 72 Misfire detected cylinder 2
Code 73 Misfire detected cylinder 3
Code 74 Misfire detected cylinder 4
Code 75 Misfire detected cylinder 5
Code 76 Misfire detected cylinder 6
Code 80 Exhaust re-circulation system
Code 86 Coolant temperature
Code 92 Evaporate emission control system
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