LARRY-27 Posted July 10, 2008 Report Share Posted July 10, 2008 Hey, i have a 97"deville and both of my cooling fans stopped working. I was playing my a/c when i notice a burning smell. I turn'd off my a/c then my car started to run hot. later i turn'd my a/c on and notice my fans had stopped working. I'm getting a code pcm p1376 can someone tell me how to fix this problem? Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 10, 2008 Report Share Posted July 10, 2008 Check the fuses and the AC Comp fuse for the cooling fans. The cooling fans are on the same circuit as the AC compressor, does your AC compressor engage? P1376 - Ignition Ground Circuit DTC P1376 Ignition Ground Circuit Circuit Description The PCM applies 2.5 volts on the Ref Lo voltage (CKT 453) circuit to the Ignition Control Module. Ref Lo voltage to the PCM represents the voltage difference between Ref Lo and the PCM power ground. This is needed to ensure that the PCM and IC module signals all have the same ground reference. If the Ref Lo input voltage goes too high or low, DTC P1376 will set. Conditions for Setting the DTC Test Condition DTC P0560 is not set. Failure Conditions Ignition Control Module Ref Lo input is + 1.48 volts or greater for 1 second. OR Ignition Control Module Ref Lo input is - 1.01 volts or less for 1 second. This DTC may set due to an improperly installed PCM. This may cause the PCM to not be electrically isolated from the body ground. Using the scan tool the normal average Ref Lo voltage displayed is 0.00 volts + or - 0.20 volts. Test Description Number(s) below refer to the step number(s) on the Diagnostic Table. If the snapshot ignition ground voltage is 1.1 volt or less, this means that the PCM ground voltage is floating high causing P1376 to set. Voltage measured at ignition control module connector C4 terminal F should be less than 0.1 volt. If the voltage is higher, then the module must have a bad ground causing the module to try to ground through the Ref Lo input to the PCM. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
LARRY-27 Posted July 10, 2008 Author Report Share Posted July 10, 2008 I CHECKED ALL FUSES AC COMP FUSE,RELAY NEXT TO THE FUEL PUMP RELAY. MY AC COMPRESSOR NOW WILL ENGAGE WHEN DISGAGE. ARE THERE ANY MORE RELAYS FOR THE FANS? Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 10, 2008 Report Share Posted July 10, 2008 See this recent thread, there is a lot of information in it on cooling fans http://caddyinfo.ipbhost.com/index.php?showtopic=17942 Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
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