1995 Oldsmobile 98 Error Code P1640 Quad Driver Module 1 P1670 Module They

1995 OLDSMOBILE 98
18,600 MILES
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I have an error code P1640 Quad Driver Module 1 and a P1670 Quad Driver Module. They started late summer after the AC Cluch seized up. So far I have replaced the EGR Valve (cleaned the bypass pipe) and the Transmission shift solenoids. I was told it could be the fuel pump because of the pressure on fuel rail is reading 40 PSI. Could it be the fuel pump? If not what could it be? PLEASE HELP!

Thank you.
Jan 6, 2013 at 6:06 AM
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HMAC300
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for 1640 check fan fuse and cruise control fuse first.same for codes 1670 otherwise have apro check this out as it mayb be something really involved.
Jan 6, 2013 at 4:06 PM
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HMAC300
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fule pressure should be 41-47 psi with key on and engine not running. it should hold pressure of +-5 psi after shutdown but could be pump or filter.
Jan 6, 2013 at 4:07 PM
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