Guest wheelsport Posted January 15, 2015 Share Posted January 15, 2015 I earlier posted a question about my turbo coming on and off under heavy acceleration. Hemi suggested that there is a problem with correct waste gate operation. I have determined that the waste gate is working fine. I get a test code of 14 which indicates that the voltage at the map sensor isn't right. While testing the map sensor, I find the voltage to #3 wire is only 2.5 volts not 4.7. The ground wire reads 7 volts instead of 12 volts when checked. The other wire voltage is 5 volts. The sensor voltage varies when tested with a vacuum pump. Any ideas? Link to comment Share on other sites More sharing options...
Digger914 Posted January 16, 2015 Share Posted January 16, 2015 I earlier posted a question about my turbo coming on and off under heavy acceleration. Hemi suggested that there is a problem with correct waste gate operation. I have determined that the waste gate is working fine. I get a test code of 14 which indicates that the voltage at the map sensor isn't right. While testing the map sensor, I find the voltage to #3 wire is only 2.5 volts not 4.7. The ground wire reads 7 volts instead of 12 volts when checked. The other wire voltage is 5 volts. The sensor voltage varies when tested with a vacuum pump. Any ideas?Voltage comes from and goes to engine control module, MAP sensors are easier to get and cost less than control module, bad connections add resistance to lines causing voltage drop, and where did you reference voltage / plug on or off the MAP. Thoughts only as I don't have a book for an 89, check and re-seat all connections, replace MAP first if problem persists. Link to comment Share on other sites More sharing options...
Guest wheelsport Posted January 16, 2015 Share Posted January 16, 2015 The plug was still connected to the MAP for the voltage variance and disconnected for ground test. Where is the control module located? Link to comment Share on other sites More sharing options...
Bill Reichert Posted January 16, 2015 Share Posted January 16, 2015 Very simple check... pull the vac line on the fuel pressure regulator. Sniff for gas odor. If the fpr leaks, it can throw the map off! Link to comment Share on other sites More sharing options...
Digger914 Posted January 16, 2015 Share Posted January 16, 2015 Very simple check... pull the vac line on the fuel pressure regulator. Sniff for gas odor. If the fpr leaks, it can throw the map off!If you didn't do this first, Do what Bill said.Control on driver side surrounded by air box and battery, Link to comment Share on other sites More sharing options...
Hemi Dude Posted January 19, 2015 Share Posted January 19, 2015 Where is the control module located? To a question such as this, my advice is to take your car to a professional mechanic. One who is familiar with Chrysler engines and their electronics Link to comment Share on other sites More sharing options...
89TC-16V Posted January 19, 2015 Share Posted January 19, 2015 To a question such as this, my advice is to take your car to a professional mechanic. One who is familiar with Chrysler engines and their electronicsof course you will probly not find many. most of them will see the TC and jack up their rate Link to comment Share on other sites More sharing options...
Hemi Dude Posted January 19, 2015 Share Posted January 19, 2015 (edited) of course you will probly not find many. most of them will see the TC and jack up their rateDo honest, professionals in your part of the country really do that, jack up the prices based on the make of automobile showing up at their door? Oh, I see you are in the Garden State. Is it still run by the Maffia? I use to live there, in the '60s. Glad I'm not now. Edited January 19, 2015 by Hemi Dude needed to add a little... (see edit history) Link to comment Share on other sites More sharing options...
Bill Reichert Posted January 20, 2015 Share Posted January 20, 2015 Funny you should mention that Hemi. A couple of years ago I stopped at a gas station in Hannibal Mo. Two cars pulled up on the other side of the pumps. First one had opera blaring on the stereo. Occupants were in the finest Jersey clothing and hair styles. The second car had two gorillas to guard the occupants of the first car. I couldn't figure out if they were on the way to Lake of the Ozarks or Branson........ Maybe they just wanted to see Mark Twain's home? Link to comment Share on other sites More sharing options...
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