對(dui)前3種情況應(ying)(ying)清洗先導閥及活動(dong)鐵芯(xin)上的(de)(de)油(you)泥和雜質(zhi)。而電(dian)(dian)(dian)路(lu)(lu)故障一(yi)般又分(fen)為控制電(dian)(dian)(dian)路(lu)(lu)故障和電(dian)(dian)(dian)磁(ci)線(xian)(xian)圈故障兩類。在(zai)檢(jian)(jian)查(cha)(cha)電(dian)(dian)(dian)路(lu)(lu)故障前，應(ying)(ying)先將(jiang)換(huan)向(xiang)閥的(de)(de)手動(dong)旋鈕轉動(dong)幾下(xia)，看換(huan)向(xiang)閥在(zai)額定(ding)(ding)(ding)的(de)(de)氣壓(ya)(ya)下(xia)是(shi)否能(neng)正(zheng)常換(huan)向(xiang)，若能(neng)正(zheng)常換(huan)向(xiang)，則(ze)(ze)是(shi)電(dian)(dian)(dian)路(lu)(lu)有(you)故障。檢(jian)(jian)查(cha)(cha)時，可用儀表測量(liang)電(dian)(dian)(dian)磁(ci)線(xian)(xian)圈的(de)(de)電(dian)(dian)(dian)壓(ya)(ya)，看是(shi)否達到了額定(ding)(ding)(ding)電(dian)(dian)(dian)壓(ya)(ya)，如(ru)果電(dian)(dian)(dian)壓(ya)(ya)過低，應(ying)(ying)進(jin)一(yi)步檢(jian)(jian)查(cha)(cha)控制電(dian)(dian)(dian)路(lu)(lu)中的(de)(de)電(dian)(dian)(dian)源和相關聯(lian)的(de)(de)行(xing)程開關電(dian)(dian)(dian)路(lu)(lu)。如(ru)果在(zai)額定(ding)(ding)(ding)電(dian)(dian)(dian)壓(ya)(ya)下(xia)換(huan)向(xiang)閥不能(neng)正(zheng)常換(huan)向(xiang)，則(ze)(ze)應(ying)(ying)檢(jian)(jian)查(cha)(cha)電(dian)(dian)(dian)磁(ci)線(xian)(xian)圈的(de)(de)接頭(tou)(插頭(tou))是(shi)否松動(dong)或(huo)接觸(chu)不實。方法是(shi)，拔下(xia)插頭(tou)，測量(liang)線(xian)(xian)圈的(de)(de)阻值(zhi)，如(ru)果阻值(zhi)太大或(huo)太小，說明電(dian)(dian)(dian)磁(ci)線(xian)(xian)圈已(yi)損壞，應(ying)(ying)更換(huan)。