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This is a good waveform |
| Vehicle: |
Vauxhall |
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Coolant Temperature Sensor – Vauxhall Waveform Notes
In this particular instance we are observing the relationship between the signal from the Crank Angle Sensor (CAS) and the Camshaft Sensor or Cylinder Identification sensor (CID).
The Coolant Temperature Sensor (CTS) on this particular vehicle has completely different voltage characteristic to that on an a conventional system. On the conventional CTS, the voltage will be seen to drop as the engine temperature increases. When cold the voltage will be approximately 3 to 4 volts, once normal operating temperature is achieved this voltage will be around 1 volt. The quoted voltages are however manufacturer specific. Most temperature sensors will have a Negative Temperature Coefficient (NTC) so the voltage decreases with an increase in engine temperature. Positive Temperature Coefficient (PTC) sensors will have an increasing voltage as the temperature rises.
The CTS used in the Multec system on the Vauxhall Vectra 1.6 Lt. engine has a distinctive waveform when viewed on the oscilloscope. The voltage seen at the CTS will display a conventional voltage reduction, until the engine reaches 40 - 50 °C at which point the voltage rises dramatically due to internal switching inside the Electronic Control Module (ECM). The reason for the voltage change is that at higher operating temperatures (50 °C plus), the ECM is now able to offer finer control with the increased voltage.
汽車診斷 | 汽車診斷儀 | 汽車故障診斷儀 | 汽車測(cè)試儀 | 汽車分析儀 | 汽車診斷示波器 | 汽車電路測(cè)試儀 | 汽車電路分析儀 | 發(fā)動(dòng)機(jī)分析儀 | 發(fā)動(dòng)機(jī)綜合分析儀 | 發(fā)動(dòng)機(jī)檢測(cè)中心 | 點(diǎn)火分析儀 | 點(diǎn)火測(cè)試儀 | 汽車傳感器測(cè)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(cè)儀 | 噴油嘴測(cè)試儀 | 點(diǎn)火線圈測(cè)試儀 | 蓄電池測(cè)試儀 | 發(fā)電機(jī)測(cè)試儀 | 起動(dòng)機(jī)測(cè)試儀 | ABS傳感器測(cè)試儀 | ECU測(cè)試儀 | ECM測(cè)試儀 | 進(jìn)氣真空/壓力測(cè)試儀 | 排氣壓力測(cè)試儀 | 汽車技術(shù)培訓(xùn) | 爆震傳感器測(cè)試儀 | 缺火測(cè)試儀 | 缺缸測(cè)試儀 | 線路測(cè)試儀 | 引出線 | 汽車數(shù)字示波器 | 真空傳感器 | 高壓感應(yīng)測(cè)試頭 | 無(wú)分電器點(diǎn)火測(cè)試頭 | 獨(dú)立點(diǎn)火（COP）感應(yīng)測(cè)試頭 | 漏電測(cè)試儀 | 氣缸相對(duì)壓縮測(cè)試 | 電腦測(cè)試儀 | 發(fā)動(dòng)機(jī)控制器測(cè)試儀 | 泄漏測(cè)試儀 | 熒光檢漏 | 超聲波檢漏 | 汽車數(shù)字萬(wàn)用表 | 電流鉗表 | 電流勾表 | 點(diǎn)火正時(shí)燈 |
