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I change all component in HIC1 except capacitor, now the HIC1 no CEL 4. Thank you dip, without you i will never know about the comparator Ic..

Good news.
Happy for you.

So Majdi... What was the actual part that was the root cause?

Im sorry e-tech, because laziness attitude i change the all component at one time, i should change one component and test for CEL 4, because i do not expect it work, i just change all the component and the CEL 4 gone. I no guarantee if fix in future.

I would really like to know the most common issue with the CKP circuit, I have 2 P2T (99-00 Civic SI) ecus that throw P0335 (CEL 4), but the car drives fine with a P28 and adapter harness. If anyone has any info it would be greatly appreciated. Or what happens to make the ecu get fried, because I have no idea what caused it.

What is the total reference of your two P2T
37820-P2T-???

I believe P2T-A11, if memory serves me correctly.

I called the largest used parts place that I know of (LKQ) and they couldn't locate a P2T ecu. I know these ecus had issues with the oxygen sensor circuit, and the response from Honda if you had this issue was to replace the ecu, so many of these ecus have simply been thrown in the trash by dealerships. I would have taken a broken one just for parts.

http://www.ebay.com/itm/1999-2000-Honda-Civic-SI-ECU-P2t-Computer-37820-p2t-a11-5-speed-manual-ecu-/141039483271

its better if we know the actual component in HIC1 causing the error code 4... lets study hard...anyone found the component would be appreciated to share here...

Agreed, it's better to fix the failed component.

anyone know the name of component above labeled A3, B3 and C3?

The answer is on the second drawing.

If it hard to find SMD type of diode, just replace with 1N4148 or 1N4150 or 1N4449 High speed switching diode. It work well

Op-Amp circuit which is used to convert sine waveform into rectangular waveform is the schmitt trigger circuit.



-The frequency of the output of the Schmitt trigger is same as the frequency of the input signal.
-The peak to peak value of the output rectangular waveform is approximately 2Vsat.



*The above shown schematic is the sine to rectangular conversion circuit. For proper conversion of input signal from sine to rectangular, the input must be large enough to pass through both the tripping voltages.


Guess if CKP sinusoidal signal can pass this circuit, we can use to replace the module circuit.

Dual diode smd cheap and very easy to find.
Example : http://www.conrad-electronic.co.uk/ce/en/product/153208/Infineon-Technologies-BAS-40-04-Dual-Schottky-Diode-120mA-SOT-23

I frequently use in my productions.