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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

5v ref. 1998 chevy astro van 4.3L p1404 set van runs good. here for mil light on

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3 years 10 months ago #52760 by BRAD70
5v ref. 1998 chevy astro van 4.3L p1404 set van runs good. here for mil light on was created by BRAD70
During testing noticed live data has glitch but only on scan tool. Back probed powers grounds and 5v ref with scope looks good. Very odd voltage fluctuates about 1v not sure if i will be able to upload data. I am new to this type of work. About ready to call pcm. THANKS IN ADVANCE BRAD

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3 years 10 months ago #52761 by Matt T
Replied by Matt T on topic 5v ref. 1998 chevy astro van 4.3L p1404 set van runs good. here for mil light on
Have you scoped EGR position signal and EGR sensor ground yet?

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3 years 10 months ago #52834 by BRAD70
Replied by BRAD70 on topic 5v ref. 1998 chevy astro van 4.3L p1404 set van runs good. here for mil light on
Thanks Matt EGR Position and sensor ground look good. Found tsb on this p1404 code. Looks like new flash could fix this problem. Still do not like how voltage on data fluctuates about 1v I will have to work on posting Attachments on here. THANKS AGAIN BRAD

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3 years 10 months ago #52944 by BRAD70
Replied by BRAD70 on topic 5v ref. 1998 chevy astro van 4.3L p1404 set van runs good. here for mil light on
Had never see this before. tsb new program fixed the 1v voltage fluctuation on the egr signal circuit and p1404 did not return. THANKS MATT FOR YOUR HELP

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