Erro scritp CSS Honda Fit 1.4

Identification of misfires in cylinders of gasoline and diesel engines
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Diogo_Vieira
Posts: 6
Joined: Mon Oct 14, 2019 2:21 am

Erro scritp CSS Honda Fit 1.4

Post by Diogo_Vieira » Tue Oct 29, 2019 10:05 pm

Hoje tive muitas dificuldades em testar um Honda 1.4 2004.
Meu script apresentava erro na parte que deveria mostrar compressão, conforme mostra a figura abaixo.


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Após exaustivos testes e estudos em postagens antigas, descobri o real problema: ao desligar a ignição, a tensão do sensor CKP era cortada imediatamente. O sensor CKP deste veículo fica próximo da polia dianteira e recebe um negativo e um positivo pós-chave.


Repeti o Script, liguei um fio diretamente no positivo 12 Volts da bateria. Consegui resolver este problema, conforme mostra as fotos abaixo:



A imagem mostra o comportamento do CKP no momento que a ignição é desligada. Cessa os pulsos de ignição e o motor para por inércia.

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Falta agora descobrir porque os cilindros tem velocidades angulares diferentes. parece não haver problema nos injetores ou ignição. Estou com dificuldades em determinar a origem da falha do cilindro 2.


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fit 1.4 css error corrigido.mwf
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Kelvin
Posts: 15
Joined: Sun Mar 01, 2015 10:35 pm

Re: Erro scritp CSS Honda Fit 1.4

Post by Kelvin » Wed Oct 30, 2019 11:35 am

RE:
1. To solve the power problem of the CKP sensor power, use Remote Power Off device.

2. The reason for the uneven operation of the cylinders at idle (and, in particular, the worst operation of cylinder #2) is the unequal composition of the mixture in different engine cylinders, that is, the unequal ratio of such gases:
"air" - "fuel vapor" - "exhaust gas".
The root causes may be:
- unequal injection of fuel by injectors at short duration of control pulses (when the engine is idling) due to the uneven degree of contamination of the internal surfaces of the fuel injectors (one fuel injector is more dirty, the other less); in this case, the mixture of the cylinder served by a more contaminated injector will not have enough fuel, and the efficiency of the cylinder will decrease.
- unevenly adjusted thermal gaps of the timing valves in different cylinders; in this case, less air will flow into the cylinder with the largest thermal clearance of the intake valve; it also includes a worn camshaft cam;
- unequal phase of valve overlap in different cylinders and, as a result, an unequal amount of exhaust gas will remain in different cylinders; The reason may be either uneven adjustment of the thermal clearances of the timing valves or wear on the camshaft cams;
- unequally polluted channels of the EGR system: more exhaust gases from the EGR system enter one cylinder, less into the other.

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