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1994 Chevy Beretta I would like to know what the codes mean

Tiny
CHI_TOWN9999
  • MEMBER
  • 1994 CHEVROLET BERETTA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 10,200 MILES
I took my car to a shop and they said something about this car has a odb something and show me some codes. They said it was code number 75, 76, 77
And they said they are not sure why these codes are showing up in the computer thing. I brought the car in because the check engine ligt comes on after about 20 minutes or so into the drive. But when you shut the car off. Then restart it it doesnt pop up again for another 20 minutes into a drive. They car engine sounds ok. I mean on the dashboard nothing is happening. Like the oil or overheating gauge just the check engine. Can you please help me?

Sincerely,
Chi_town9999@yahoo. Com
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Friday, April 3rd, 2009 AT 11:31 AM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, I can tell you, they are egr codes. With a digital egr, there may be three solenoids. There is one code for each solenoid. The wires at the egr valve are B+ and three grounds, one ground for each solenoid. The mil and egr use the voltage circuit, so if the mil comes on, the voltage circuit is ok to that point. I can't tell if the egr valve is faulty or what.
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Friday, April 3rd, 2009 AT 12:23 PM
Tiny
CHI_TOWN9999
  • MEMBER
  • 2 POSTS
So do I have to replace the cylenidod or the vavle for the three codes? The codes are 75 76 77. Withthe egine light. Is there a proccess of elimbnation I can do to pint point the problem?

P.S lamens terms.
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Friday, April 3rd, 2009 AT 6:29 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS


https://www.2carpros.com/forum/automotive_pictures/170934_digital_egr_1.jpg



The yes column, means the codes will turn on the mil, I don't have a code set criteria.

Simply unplug the four-wire connector. Run a fused 12-volt wire to B+ terminal and alternately touch each of the other terminals to ground with a test probe. This will cause each solenoid to pull open. You can do this test with the engine idling and check for an rpm drop as you ground each solenoid. If you don't get a good rpm drop on this or any other EGR valve, you may have plugged or restricted EGR passages, which can cause a code to be set.

The above info courtesy of a trade publication. I'm not sure if I can give the name, forum rules.
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Saturday, April 4th, 2009 AT 8:47 AM

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