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.
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
86 Coolant temperature
90 Evaporative Emission Control System Leak Detected
91 Fuel Tank Pressure Circuit
92 Evaporative emission control system