So I decided to do a write up on this since I get this question a lot and it’s not in the FAQ

Tools needed:
Paper clip or wire

Step 1: Locate the 2P connector behind the console driver’s side (near the gas pedal). It’s the blue one shown here.



Step 2: Take a paper clip or wire and form it into a U to use as your jumper.



Step 3: Insert the jumper in the 2P
Connector



Step 4: Turn the ignition to ON without starting the car.
The Check engine light should start to blink revealing your code. Codes 1-9 are indicated by short blinks. Codes 10-43 are revealed with short and long blinks. Long blinks indicated the first digit and short blinks the second digit. For exemple: Two long blinks and three short blinks would indicate code 23 (i.e. Knock Sensor, one I have personally seen many times lol). Multiple codes will be shown one after the other in order from 1 to 43. I personally have had 6 at the same time. After you have read the code(s) remember to remove the jumper.

Step 5: Reset the ECU by removing the clock/radio (10A) fuse or removing the negative cable from the battery.



Heres a list of the codes/helms manual reference:

0
ECU
Page: 11-31

1
OXYGEN SENSOR
Page: 11-36

3-5
MANIFOLD ABSOLUTE PRESSURE (MAP SENSOR)
Page: 11-44

4
CRANK ANGLE (CRANK SENSOR)
Page: 11-50

6
COOLANT TEMPERATURE (TW SENSOR)
Page: 11-52

7
THROTTLE ANGLE
Page: 11-54

8
TDC POSITION (TDC SENSOR)
Page: 11-50

9
No. 1 CYLINDER POSITION (CYL SENSOR)
Page: 11-50

10
INTAKE AIR TEMPERATURE (TA SENSOR)
Page: 11-56

12
EXHAUST GAS RECIRCULATION SYSTEM (EGR)
Page: 11-135

13
ATMOSPHERIC PRESSURE (PA SENSOR)
Page: 11-58

14
ELECTRONIC AIR CONTROL (EACV)
Page: 11-76

15
IGNITION OUTPUT SIGNAL
Page: 11-60

16
FUEL INJECTOR
Page: 11-96

17
VEHICLE SPEED SENSOR
Page: 11-62

20
ELECTRIC LOAD DETECTOR (ELD)
Page: 11-64

23
KNOCK SENSOR
Page: 11-68

30
A/T Fl SIGNAL A
Page: 11-70

31
A/T Fl SIGNAL B
Page: 11-70

41
OXYGEN SENSOR HEATER
Page: 11-38

43
FUEL SUPPLY SYSTEM
Page: 11-42

Remiss

 

Code 36 on the jdm P13 ecu is traction control witch only came in the jdm prelude obviously

discoverd that mine is throwing this today haha

 

If the CEL does not blink at all and just stays on does that indicate a 0 fault code indicating ecu?

 

If the MIL is on but not flashing (when jumped), there are MANY steps to take in the service manual before you need to replace the ECU....like 2-3 pages worth.

 

 

This is great!!! Thanks guys!!!
Guess I better go steal a clip from my wife and go checking.

 

Cut the connector and wire in a switch.

Now you can check codes very quickly

 

kind of confused a little fellas, i've got 3 connectors, 2 are 2-pin(yellow&blue) and 1 is 3-pin (blue/grey)
when i jump the 2-pin blue the abs light flashes 4 slow 1 fast
when i jump the yellow 2-pin cel just stays on solid, while others all go off

 

subscribing......

 

Well if it's not to late the 2 pin blue connector is the right one. Did you find out the abs code?

 

What if my CEL doesn't come on when I just turn the key to the on spot only comes on when I start it ?

 

I have one code it's 22 I dont see a readout for 22?

 

Codes 21 and 22 are VTEC system codes. The 21 is a VTEC solenoid (spool valve) and the 22 is the VTEC pressure switch.