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Unread 2008-12-26, 03:21 PM   #1
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Default Check Engine Light (CEL)

Originally Posted by damnit*
First and foremost:
Please do not send me a PM asking, "I have do I fix it?"
I only list how to check the cel, I do not know how to fix every single issue that may pop up. A cel can come up for lots of reasons, so there is no one set answer for each of them.
If you do get a cel, check the number here and then search for what other people have done...if you cant find an answer, make a new post about it.
Again, do NOT send me a PM asking me to tell you how to fix it. The simple answer is that I cant...


Do you have a CEL?
Dont just reset the ecu by pulling the battery's neg. cable. Sure, that will reset the light, but youre not finding out whats wrong with your car! The light will always come back, until you fix it.

This is how you check your own cel (Check Engine Light), at home, without driving to a mechanic, auto store, dealer. Numbers for the light are listed farther below.

5 Easy to Follow Steps:
1) Get a CEL

2) On the passener side, remove the kick panel at the floor.
Behind it, is your ecu and a jumper plug.

3) Locate the jumper plug (Civic 92-95 is grey, 96-00 its blue). Its a 2 pin plug.
(I am not sure if the connector is in the same location for all hondas..I assume so - I dont know all the connector colors...)

For EK, there is 1 brown wire and 1 black wire

For EG, there is 1 tan wire and 1 green

4) WITH THE CAR OFF, insert either a 2pin connector clip, or loop a thin enough piece of wire into both holes on the connector.

5) Back in the driver's seat, turn the key to the 'ON' position. The CEL light will come on at startup, like normal, but it will then begin to flash.
**By counting the number of flashes, you can decipher the CEL #.
SHORT flashes are single digits (1/2 second)
LONG flashes are 10's (1 second)

-----CEL # List-----
1 O2A - Oxygen sensor #1
2 O2B - Oxygen sensor #2
3 MAP - manifold absolute pressure sensor
4 CKP - crank position sensor
5 MAP - manifold absolute pressure sensor
6 ECT - water temperature sensor
7 TPS - throttle position sensor
8 TDC - top dead centre sensor
9 CYP - cylinder sensor
10 IAT - intake air temperature sensor
12 EGR - exhaust gas recirculation lift valve
13 BARO - atmospheric pressure sensor
14 IAC (EACV) - idle air control valve
15 Ignition output signal
16 Fuel injectors
17 VSS - speed sensor
19 Automatic transmission lockup control valve
20 Electrical load detector
21 VTEC spool solenoid valve
22 VTEC pressure valve
23 Knock sensor
30 Automatic transmission A signal
31 Automatic transmission B signal
36 traction control found on JDM ecu's
41 Primary oxygen sensor heater
43 Fuel supply system
45 Fuel system too rich or lean
48 LAF - lean air fuel sensor
54 CKF - crank fluctuation sensor
58 TDC sensor #2
61 Primary oxygen sensor
63 Secondary oxygen sensor circuit
65 Secondary oxygen sensor heater wire (black wires)
67 Cat Converter
71 random misfire cylinder 1
72 random misfire cylinder 2
73 random misfire cylinder 3
74 random misfire cylinder 4
80 EGR Valve/Line
86 ECT sensor - Cooling System
91 Fuel Tank pressure sensor
92 EVAP Solenoid/Valve/Vacuum Lines

Now, if you take your OBD2 car (with cel) to a place that has a scanning tool (IE - AutoZone) the #'s will be different -> 5 digit codes.
If you go that route, the #'s are available here:
(I have never used a scan tool, so I do not know the validity of that list.)

Now that you have the corresponding # for your light, you can begin to go about fixing it. How you do that, is your call, but there are lots of members here that can probably assist you with any issue.
Once you have fixed the problem, reset the ecu, by either pulling the battery's neg. cable or pulling the ecu fuse itself.

Happy fixing
(All #'s were painstakingly pulled from a Helms manual)
Dr.John is offline