Idle RPM on EK9 ? (PCT ecu on EK4)

Discussion in 'Engine' started by GC106XT, Aug 8, 2018.


  1. GC106XT

    GC106XT New Member

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    Hello all,

    I have an EK4 (98) with B16A2 engine (ODB2A), I rebuild the head with DC2 (98) camshaft, and with valve spring, and head mileage to have 10.8:1 (0.045mm), I mount also a DC2 fuel regulator, rail and injector.
    I have but not mount actually an EK9 intake manifold with IACV an IAT. I use an OEM IAT before the BT at this time (I will make a "harness" to use the EK9 IAT on intake manifold).

    Actually, I run with a P28 ecu tuned, but it too rich and the Vtec is to early, I bought a PCT ecu ODB2A to test.
    It run good but I have the idle to 1000 RPM, and it not decrease with the AC, light ...
    And when I slow down, the rpm takes time to come down.

    With my P28 or OEM (P2T) ecu, the idle are in 800/850 RPM. I test with unplug IACV and jump a diagnostic plug, the idle are to 500 RPM, so, I don't touch the iddle screw on body trottle, and I haven't any problème to slow down.

    IACV are good and clean, map it's ok ...

    I would like to know the real idle RPM on EK9 (I not found this information) and I don't found the EK9 Workshop. And why I slow down, the RPM decrease slowly with PCT Ecu ?
    And if it's possible to use a PCT a long time on my engine, because it's with this ecu that I have a best feeling.

    Thanks a lot (and sorry for my english, I work it !!!)
     
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  2. GC106XT

    GC106XT New Member

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    Hi,
    I bought a Hondash to test the PCT on my EK4, and I found one code error : Default ELD > Code 20.
    I search on the net but I don't found this information, what is the pin to ELD on the Ecu to EK9 ?
    On my car, it's normaly D16 pin on Ecu .

    Thanks all !
     
  3. GC106XT

    GC106XT New Member

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    I Found to "by pass" the ELD and stabilize the iddle to 800 rpm with the PCT ecu on my Euro EK4.
    It's necessary to put a 3.5 Kohm resistor between D16 pin and the ground, It simulate the ELD on low charge ;)
     
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  4. ALEX-CY

    ALEX-CY Active Member

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    if you leave it on low charge the your going to have problem with the battery charging. use around 850 ohms resistor and have all the time high charge and idle around 850rpm
     
  5. GC106XT

    GC106XT New Member

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    I haven't got a ELD system on euro EK4 (D16 pin doesn't exist on my OEM ecu), the alternator have 3 wires and not 4 wires (like a JDM alternator), so it's always to "full" charge. It the same system if you cut or unplug the A19 ecu wire, the alternator it always to full charge mode (with the ELD system).
    But the ecu return the error code 20 because it not detect the ELD, and it increase the idle. I found 4,66v between D16 pin and ground without the resistor.
    I read that a resistor value it different between ODB1 and ODB2, the 850 ohms it's good for ODB1 ecu, but not to ODB2.
    I test it with a potentiometer (I'm not sure with this translation), and I found 3.5 Kohms to have 3.5v between D16 and ground.
    I test it with the Hondash system, the idle are always to 800 rpm, the ELD think that the power consumed is from 6.5A, if I activate A/C compressor on full speed, hight beam ..., the alternator charge at 100%, if the car have not power consumption, the alternator charge at around 20% and the idle rest to 800 rpm, the battery are stabilize to 14.2V even if everything is on.

    I will receive the resistor tomorrow, I test it on real condition and say if it's ok or not ;)
     

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