Não consigo recuperar atualizar meu objeto JSF | Alura

estou tentando editar meu objeto, só que ao tentar editar consigo recuperar o objeto pelo ID. Ou seja, ele recupera da URI http://localhost:8080/suspension/carro/cadastroCarro.xhtml?carro=6 Só que não monta as informações no meu formulário, fiz um converter mais não consegui.

<ui:composition template="/WEB-INF/template/layoutPadrao.xhtml"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:f="http://xmlns.jcp.org/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:p="http://primefaces.org/ui">
    <f:metadata>
        <f:viewAction action="#{consultaCarroBean.inicializa}" />
    </f:metadata>
<ui:define name="titulo">Pesquisa de Carro</ui:define>

<ui:define name="corpo">

    <h1>Pesquisa de Veículos</h1>

    <h:form id="frmPesquisa">
        <p:messages id="messages" autoUpdate="true" closable="true" />

        <p:toolbar style="margin-top: 20px">
            <p:toolbarGroup>
                <p:button value="Novo"  outcome="cadastroCarro" />
            </p:toolbarGroup>
        </p:toolbar>

        <p:dataTable id="carrosTable" value="#{consultaCarroBean.carros}" var="carro" style="margin-top: 20px" 
                     emptyMessage="Nenhum carro encontrado." rows="5"
                     paginator="true" paginatorAlwaysVisible="false" paginatorPosition="bottom"
                     lazy="true" rowsPerPageTemplate="5,10,15">

                <p:column headerText="Código" style="text-align: center; width: 100px">
                    <h:outputText   value="#{carro.codigo}" style="text-align: center" />
                </p:column>
                <p:column headerText="Modelo" style="text-align: center; width: 150px">
                    <h:outputText  value="#{carro.modeloCarro.nome}"  />
                </p:column>
                <p:column headerText="Placa" style="text-align: center; width: 100px">
                    <h:outputText value="#{carro.placa}" />
                </p:column>
                <p:column headerText="Cor" style="text-align: center; width: 100px">
                    <h:outputText  value="#{carro.cor}" />
                </p:column>
            <p:column headerText="Ano" style="text-align: center; width: 100px">
                <h:outputText  value="#{carro.ano}" />
            </p:column>

            <p:column style="width: 100px; text-align: center" headerText="Editar / Excluir"  >
                <p:button outcome="cadastroCarro" icon="ui-icon-pencil" title="Editar">
                    <f:param name="carro" value="#{carro.codigo}" />
                </p:button>
                -
                <p:commandButton icon="ui-icon-trash" title="Excluir" oncomplete="PF('confirmacaoExclusao').show()"
                        process="@this" update=":frmPesquisa:confirmacaoExclusaoDialog">
                     <f:setPropertyActionListener value="#{carro}" target="#{consultaCarroBean.carroselecionado}" />
                </p:commandButton>
            </p:column>
        </p:dataTable>

        <p:confirmDialog id="confirmacaoExclusaoDialog" widgetVar="confirmacaoExclusao"
                message="Tem certeza que deseja excluir o carro de placa "  
                header="Exclusão de carro" severity="alert">
            <p:button value="Não" onclick="PF('confirmacaoExclusao').hide(); return false;" />
            <p:commandButton value="Sim" update=":frmPesquisa:carrosTable" process="@this" oncomplete="PF('confirmacaoExclusao').hide()" 
                        action="#{consultaCarroBean.excluir}"    />
        </p:confirmDialog>
    </h:form>
    </ui:define>
</ui:composition>

Cadastro

<ui:composition template="/WEB-INF/template/layoutPadrao.xhtml"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:f="http://xmlns.jcp.org/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:p="http://primefaces.org/ui" xmlns:o="http://omnifaces.org/ui">

<f:metadata>
    <o:viewParam name="carros" value="#{cadastroCarroBean.carro}" />
    <f:event listener="#{cadastroCarroBean.inicializar}" type="preRenderView" />
</f:metadata>

<ui:insert name="titulo">#{cadastroCarroBean.editando ? 'Editando Carro' : 'Novo Carro'}</ui:insert>

<ui:define name="corpo">

<h1>#{cadastroCarroBean.editando ? 'Editando Carro' : 'Novo Carro'}</h1>

    <h:form id="frmCadastro" enctype="multipart/form-data">
        <p:messages id="messages" autoUpdate="true" closable="true" />

        <p:toolbar style="margin-top: 20px">
            <p:toolbarGroup>
                <p:commandButton value="Salvar" action="#{cadastroCarroBean.salvar}"  id="botaoSalvar"    update="frmCadastro" />
            </p:toolbarGroup>
            <p:toolbarGroup align="right">
                <p:button value="Pesquisa" outcome="pesquisaCarro" />
            </p:toolbarGroup>
        </p:toolbar>

        <p:panelGrid columns="2" id="painel" style="width: 100%" columnClasses="rotulo, campo">
            <p:outputLabel value="Código" for="codigo" />
            <p:inputText id="codigo" value="#{cadastroCarroBean.carro.codigo}" size="20" maxlength="20" readonly="true" />

            <p:outputLabel value="Modelo Carro" for="modeloCarro" />
            <p:selectOneMenu id="modeloCarro" value="#{cadastroCarroBean.carro.modeloCarro}" required="true">
                <f:selectItem itemLabel="--escolha o carro--" noSelectionOption="true"/>
                <f:selectItems value="#{cadastroCarroBean.modeloCarros}" var="modeloCarros" itemLabel="#{modeloCarros.nome}"  itemValue="#{modeloCarros}"/>
            </p:selectOneMenu>                

            <p:outputLabel value="placa" for="placa" />
            <p:inputMask mask="aaa-9999" value="#{cadastroCarroBean.carro.placa}" size="11"    style="text-transform:uppercase;" styleClass="campo" 
                         id="placa" required="true" />

            <p:outputLabel value="ano" for="ano" />
            <p:inputMask mask="9999" value="#{cadastroCarroBean.carro.ano}" size="11" styleClass="campo" id="ano" required="true" />

            <p:outputLabel value="cor" for="cor" />
            <p:inputText maxlength="15" value="#{cadastroCarroBean.carro.cor}" size="11" styleClass="campo" id="cor" required="true">
                <f:validateRegex pattern="[a-zA-Z]+" />
            </p:inputText>
        </p:panelGrid>
    </h:form>
</ui:define>

Converter

package com.irmaosuspension.controleservico.converter;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.FacesConverter;

import com.irmaosuspension.controleservico.cdi.CDIServiceLocator;
import com.irmaosuspension.controleservico.dao.CarroDAO;
import com.irmaosuspension.controleservico.modelo.Carro;

@FacesConverter(forClass=Carro.class)
public class ConverterCarro implements Converter{

    private CarroDAO dao;

    public ConverterCarro() {
        this.dao = CDIServiceLocator.getBean(CarroDAO.class);
    }

    public Object getAsObject(FacesContext arg0, UIComponent arg1, String value) {
        Carro carro = null;

        if(value != null && value !=""){
            carro = this.dao.buscarPeloCodigo( new Long(value));
        }

        return carro;
    }

    public String getAsString(FacesContext arg0, UIComponent arg1, Object value) {

        if(value != null){
            Long code = ((Carro)value).getCodigo();
            return code == null ? null : code.toString();
        }
        return "";
    }


}

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