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Air Flow Meter (Faulty Air Vane) Waveform Notes
This particular Air Flow Meter (AFM) was used on early electronic injection systems and has the same operational qualities as the later 5 volt systems. The voltage should be seen to rise as the air vane is moved with no breaks or loss of continuity. The example shown clearly demonstrates that just as the vane moves a loss of contact is seen with the same fault occurring again as the throttle is released and the engine returns to idle.
A time base of approximately 2 seconds plus is used, this enables the operator to view the AFM's movement on one screen, from idle, through acceleration and back to idle again.
An AFM with this particular output would produce ‘flat-spots’ or ‘hesitations’ when driven. As the carbon tile has sustained damage the only way to rectify this problem is to change the unit for a new one. Removal of the plastic cover will invariably show the white plastic of the tile clearly visible through the carbon track, however this may only become apparent when the track is cleaned with a solvent spray such as carburettor cleaner.
汽車診斷 | 汽車診斷儀 | 汽車故障診斷儀 | 汽車測試儀 | 汽車分析儀 | 汽車診斷示波器 | 汽車電路測試儀 | 汽車電路分析儀 | 發動機分析儀 | 發動機綜合分析儀 | 發動機檢測中心 | 點火分析儀 | 點火測試儀 | 汽車傳感器測試儀 | CAN總線示波器 | LIN總線示波器 | 汽車故障記錄儀 | 汽車傳感器分析儀 | 汽車檢測儀 | 噴油嘴測試儀 | 點火線圈測試儀 | 蓄電池測試儀 | 發電機測試儀 | 起動機測試儀 | ABS傳感器測試儀 | ECU測試儀 | ECM測試儀 | 進氣真空/壓力測試儀 | 排氣壓力測試儀 | 汽車技術培訓 | 爆震傳感器測試儀 | 缺火測試儀 | 缺缸測試儀 | 線路測試儀 | 引出線 | 汽車數字示波器 | 真空傳感器 | 高壓感應測試頭 | 無分電器點火測試頭 | 獨立點火（COP）感應測試頭 | 漏電測試儀 | 氣缸相對壓縮測試 | 電腦測試儀 | 發動機控制器測試儀 | 泄漏測試儀 | 熒光檢漏 | 超聲波檢漏 | 汽車數字萬用表 | 電流鉗表 | 電流勾表 | 點火正時燈 |
