Bad square wave signal from CPS?

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BristolE30
E30 Zone Regular
E30 Zone Regular
Posts: 532
Joined: Thu May 16, 2019 7:43 pm
Location: Bristol

Post Sat Mar 20, 2021 12:32 pm

Hey guys,

Is it just me or should this CPS signal be square wave?

Have had a terrible dying idle on the rev come down for a while. Thinking it could this dirty signal?
Last edited by BristolE30 on Sat Mar 20, 2021 7:05 pm, edited 1 time in total.
BMW E30 316 ‘87
BMW E30 325i ‘88 :bmw:
Bristol, UK
BristolE30
E30 Zone Regular
E30 Zone Regular
Posts: 532
Joined: Thu May 16, 2019 7:43 pm
Location: Bristol

Post Sat Mar 20, 2021 12:33 pm

BMW E30 316 ‘87
BMW E30 325i ‘88 :bmw:
Bristol, UK
BristolE30
E30 Zone Regular
E30 Zone Regular
Posts: 532
Joined: Thu May 16, 2019 7:43 pm
Location: Bristol

Post Sat Mar 20, 2021 8:18 pm

@brianmooore any thoughts?

From reading the wiki it clearly states the CPS should convert the sine wave into a square wave. My oscilloscope is showing a sine wave though!! And also it’s really intermittent it seems.
BMW E30 316 ‘87
BMW E30 325i ‘88 :bmw:
Bristol, UK