OBD1 – Engine Trouble Code Info-Honda 95 & Earlier

Paper Clip Trick
Paper Clip Trick

It’s the weekend, you’re out enjoying the open road, and WHAM, your “Check Engine” light rears it’s ugly head.

Now you are wondering what is wrong with the engine? While all you need now is some OBD1 Trouble Code Info to steer you in the right direction.

So here’s how you can learn what you’re Electronic Control Unit (ECU) is trying to tell you. Consequently the ECU loves to talk in code. Therefore the only problem is deciphering it.

As a result you have this article to help you interpret it.

OBD1-Hence the ’86-’91 Honda and ’86-’93 Acura were equipped with a window on the ECU. On the other side of this window is an LED. This little LED would flash the code when the key was in the ON position. But unfortunately, the ’92-’00 Honda and ’94-’00 ECU was upgraded without an access window or LED. Now replacing the LED  is a flashing check engine light. As a result all that you need now is to pull the trouble codes, and you can do it with a jumper wire. ( Paper Clip )

Locate the factory diagnostic plug next to the ECU for the Integra and Civic. Consequently you’ll find this plug in the passenger side foot well underneath the far right hand side of the glove box.

Honda Paper Clip Trick
Honda Paperclip Trick
OBD1 Connector
OBD1 Connector

So there is a two-pin connector that contains a brown and black wire. Jump these two wires together and turn your key to the ON position.

Furthermore here is where it gets tricky, learning to read your OBD1 Trouble Code Info.

Deciphering the code requires reading the light sequences. Hence when the car is in the ON position, the check engine light emits two different flashes; a long extended flash means 10, and a rapid flash means 1.   So, one long flash, another long flash, followed by 3 quick flash stands for……………….23!

Furthermore equipped with this information, here are the codes for the ’92-’00 Honda and ’94-’00 Acura.

OBD1 Trouble Codes:

Code 0 and 11 Electronic Control Module (ECM)

1 Heated oxygen sensor A

2 Oxygen content B

3 and 5 Manifold Absolute Pressure

4 Crank position sensor

5 Map Sensor

6 Engine coolant temperature

7 Throttle position sensor

8 Top dead center sensor

9 No.1 cylinder position sensor

10 Intake air temperature sensor

12 Exhaust recirculation system

13 Barometric pressure sensor

14 Idle air control valve or bad ECM

15 Ignition output signal

16 Fuel Injector

17 Vehicle speed sensor

19 A/T lock-up control solenoid

20 Electric load detector

21 V-TEC control solenoid

22 V-TEC pressure solenoid

23 Knock sensor

30 TCM Signal A

31 TCM Signal B

41 Heated oxygen sensor heater

43 Fuel supply system

45 Fuel supply metering

48 Heated oxygen sensor

54 Crankshaft Speed Fluctuation Sensor

61  Primary Front heated oxygen sensor

63  Secondary Rear heated oxygen sensor

65 Rear heated oxygen sensor heater

67 Catalytic converter system

70 Automatic transaxle

71 Misfire detected cylinder 1

72 Misfire detected cylinder 2

73 Misfire detected cylinder 3

74 Misfire detected cylinder 4

75 Misfire detected cylinder 5

76 Misfire detected cylinder 6

80 Exhaust recirculation system

86 Coolant temperature

90 Evaporative Emission Control System Leak Detected

91 Fuel Tank Pressure Circuit

92 Evaporative emission control system

Clearing Codes:

Disconnect the negative battery cable for at least 10 seconds to clear codes.

Disclaimer: We cannot guarantee the accuracy of all trouble codes.We try and make them as accurate as we can, but sometimes we all make mistakes. Warning: Please check for manufacturer specific codes with an appropriate manual.