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List of ECU Warning Codes - Check Engine Light CEL

Posted 02-16-2002 at 01:00 AM by drumsy
Updated 06-24-2011 at 11:14 AM by MeltMan

Picture this. It's the weekend, you're out enjoying the open road, and WHAM, your "Check Engine" light rears it's ugly head. Ever wondered what was wrong with the engine? Not have enough money to take it to your mechanic and let him decipher the enigma? Well here's how you can learn what you're Electronic Control Unit (ECU) is trying to tell you.

Like the code machines of old, the ECU loves to talk in code. The only problem is deciphering it. Fortunately, you have this article to help you interpret it.

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. Replacing the LED though is a flashing check engine light. All that you need now is to pull the trouble codes, and you can do it with a jumper wire.

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





Here is where it gets tricky.

Deciphering the code requires reading the light sequences. 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!

Equipped with that information, here are the codes for the '92-'00 Honda and '94-'00 Acura.
0 ECU
1 Oxygen Content
3 Map Sensor
4 Crank Angle Sensor
5 Map Sensor
6 Coolant Temperature
7 Throttle Angle
8 TDC Position
9 No 1 Cylinder Position
10 Intake Air Temperature
63 Intake Air Temperature
12 Exhaust Gas Recirculation System
13 Atmosphere Pressure
14 Electronic Air Control
15 Ignition Output Signal
16 Fuel Injector
17 Vehicle Speed Sensor
20 Electronic Load Detector
21 VTEC Solenoid Valve (1.8L GSR)
22 VTEC Oil Pressure Switch (1.8L GSR)
23 Knock Sensor
30 TCM Signal A
31 TCM Signal B
41 o2 Sensor Heater
43 Fuel Supply System
45 System Too Rich or Too Lean
48 Primary Heated o2 Sensor
54 Crankshaft Speed Fluctuation Sensor
61 Primary o2 Sensor Circuit
63 Secondary o2 Sensor Circuit
65 Secondary o2 Sensor Circuit
67 Catalyst System
70 Automatic Transaxle
71-74 Random Misfire
80 Exhaust Gas Recirculation
86 Engine Coolant Temperature Circuit
90 Evaporative Emission Control System Leak Detected
91 Fuel Tank Pressure Circuit
92 Evaporative Emission Control System Insufficient

Hope these codes help you greatly. Till next time!
Posted in ECU Information
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Comments

  1. Old Comment
    Veryyyy helpful what about the CEL codes for a 93 teg ?
    permalink
    Posted 06-30-2012 at 03:32 AM by Brandon93 Brandon93 is offline
  2. Old Comment
    This.is for obd1 right
    permalink
    Posted 03-07-2013 at 05:48 PM by 99tegsilver 99tegsilver is offline
  3. Old Comment
    Can I do this on my 1999 teg
    permalink
    Posted 03-07-2013 at 05:58 PM by 99tegsilver 99tegsilver is offline
  4. Old Comment
    Hello all, this may be stupid to ask, but if the check engine light only stays on does that mean that the ecu could be bad?
    permalink
    Posted 07-19-2013 at 09:06 AM by timstriumph timstriumph is offline
 

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