P0689 engine code please help

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Feb 10, 2008 | 05:30 PM

cencalrx7

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P0689 engine code please help

I got this code p0689 ECM/PCM (Power Relay Sense Circuit Low) My car starts on fine idles good for about 5 minutes then when it warms up then starts running like **** ,misfires and difficult to start what can it be BTW I have a 93 Mazda RX-7 with a 06 LS2 GTO engine

Last edited by cencalrx7; Feb 27, 2008 at 08:35 AM.

Feb 10, 2008 | 07:57 PM

sreve

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what pcm? what OS corvette? it can make a differnce.
on corvette it's ignition relay feedback back voltage low.
if the pcm sees less than 10v for more than 5 seconds it will spit the code.

Feb 10, 2008 | 08:50 PM

cencalrx7

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Quote:

Originally Posted by sreve

what pcm? what OS corvette? it can make a differnce.
on corvette it's ignition relay feedback back voltage low.
if the pcm sees less than 10v for more than 5 seconds it will spit the code.

sorry man i'm new at this ls engines I have a 06 LS2 GTO engine

Feb 27, 2008 | 08:37 AM

cencalrx7

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BTW I checked for 12v on my PCM and it's good after I clear the code it does not come back but the main problem is that the car starts fine and after 5 minutes it starts misfiring anbody else can help me out

Last edited by cencalrx7; Feb 27, 2008 at 08:43 AM.