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Discussion Starter #1
I've seen this asked quite alot on the UK forum so I decided I'd do a write-up. Hopefully it'll be of some use to you guys as well.

If anyone would do anything different then please say and I'll correct/change it.

The code is determined by long and short flashes, if you have seen the animation above you should see what I mean by this.

A long flash = 10
A short flash = 1

So in the animation the code returned is 12 - this points me towards the EGR system.

If you have more than one code the CEL will flash them out and continually loop. IE. 12, 14, 15, 12, 14, 15, 12 .....

Here is a list of codes for the 4G Prelude ONLY

  • 0 Engine Control Module (ECM)
    1 Heated Oxygen Sensor (HO2S)
    3 Manifold Absolute Pressure (MAP SENSOR)
    5 Same as above
    4 Crankshaft Position (CKP SENSOR)
    6 Engine Coolant Temperature (ECT SENSOR)
    7 Throttle Position (TP SENSOR)
    8 Top Dead Centre Position (TDC SENSOR)
    9 No. 1 Cylinder Position (CYP SENSOR)
    10 Intake Air Temperature (IAT SENSOR)
    12 Exhaust Gas Recirculation (EGR VALVE LIFT SENSOR)
    13 Barometric Pressure (BARO SENSOR)
    14 Idle Air Control (IAC VALVE)
    15 Ignition Output Signal
    16 Fuel Injector
    17 Vehicule Speed Sensor (VSS)
    20 Electric Load Detector (ELD)
    21 Variable Valve Timing & Valve Lift Electronic Control (VTEC) Solenoid Valve
    22 Variable Valve Timing & Valve Lift Electronic Control (VTEC) Pressure Switch
    23 Knock Sensor (KS)
    41 Heated Oxygen Sensor (HO2S) Heater
    43 Fuel Supply System
Once you have the codes, I would reset the ECU. You can do this by pulling out the clock/radio fuse from under the hood for a minute or so.

Once reset leave the to car idle for 5-10 mins, then go for a drive again. If your CEL light appears again, do the above steps, if its the same code then more investigation is required.

A good online resource is

Hope this is useful to a few anyway. :bigthumb:

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