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Old 03-07-2021, 07:51 AM
Dr Dave Dr Dave is offline
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Default Not so square wave

Can some one tell me what this square wave from a Toyota VVT oil control solenoid 4.0 means? I think that since the wiring to the ECM check out I see the ECM not able to pull a solid ground .That would be a ECM internal /transister? or maybe a bad ground to the ECM/?
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Old 03-07-2021, 08:43 AM
Dr Dave Dr Dave is offline
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Default attmt.

hopefully this is it if not Ill try tomarrow at the shop
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File Type: jpg toy vvt capture.jpg (20.4 KB, 31 views)
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Old 03-08-2021, 05:07 AM
Rich Shepherd Rich Shepherd is offline
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Quote:
Originally Posted by Dr Dave View Post
Can some one tell me what this square wave from a Toyota VVT oil control solenoid 4.0 means? I think that since the wiring to the ECM check out I see the ECM not able to pull a solid ground .That would be a ECM internal /transister? or maybe a bad ground to the ECM/?
A square wave will look like the one in your image if your black lead is not making a connection to ground. Since the waveform looks normal when you connect the black lead to the battery negative, check your ground connection at the sensor when connecting there.
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