How To Test A Knock Sensor
How To Test A Knock Sensor. Turn the engine off and engage the emergency brake. I read somewhere ages ago.
Service manual calls for 'tapping' on the side of the block with something metalic, and making sure sensor outputs a knock reading. The knock sensor is located on the engine block, cylinder head, or intake manifold. Ignition timing should retard more with knock sensor connector disconnected than with knock sensor connector connected.
Start The Scope To See Live Data.
Turn the engine off and engage the emergency brake. A knock sensor detects abnormal sounds from the engine, which are called engine knock. If you can hear a slight change on the engine’s sound, then your knock sensor is working.
Park The Vehicle On A Level Surface.
Start engine and let idle. The lt blu wire is identified with the letter b in the photo above. Open the hood of the vehicle and then turn the engine.
You Can Lightly Tap The Area Surrounding The Sensor To Manually Test It.
It is typically found on the engine block or intake manifold. Well, knock sensor comes with two main uses: Ignition timing should retard more with knock sensor connector disconnected than with knock sensor connector connected.
Using Scan Tool, Check Data List Item No.
Service manual calls for 'tapping' on the side of the block with something metalic, and making sure sensor outputs a knock reading. Alternative and more sophisticated way of testing is hooking up sensor to the microphone input on a cellphone/laptop/pc but that would involve butchering a 3.5mm jack. This tutorial performs this method to help you test and repair your vehicle's knock sensor.
Click Through To Watch This Video On Mytopclip.com
Another issue could be the cable that is attached from the sensor to the main ecu (or wherever it goes). Clip the multimeter lead to the knock sensor; How to check a knock sensor for continuity.
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