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2003 CHEVROLET ASTRO
78,000 MILES • 2.4L • V6 • 4WD
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DEQUESO
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Engine light on, scanner check no power. I check the terminal got ground through system got voltage through system. Used my ohm meter. Battery post 2 port got reading ground 3 ports got reading?
Jun 26, 2021 at 12:28 PM
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ASEMASTER6371
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Good afternoon,

I attached a diagram of the diagnostic port for you. Pin 16 is the power for the connector. Check the voltage there. It should have voltage all the time. Pin 4 is the ground.

I attached a diagram of the port for you to view. Check pin 16 for power.

Roy
Jun 26, 2021 at 3:56 PM
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DEQUESO
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Used jumper from positive post 2 #16 key off had power. Ohm meter on ohms got reading on terminal 3 and 4 how can a scanner show nothing?
Jun 27, 2021 at 8:00 AM
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ASEMASTER6371
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Forget checking for ohms. You do not use that as a check.

6 and 14 are the serial data line that should have 60 ohms but if the scanner has no power then it is a moot point.

Did you check pin 4 for ground? If you did, then it may be your scan tool not working. You should have the scanner to light up with 4 and 16 workings.

Roy
Jun 27, 2021 at 8:04 AM
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DEQUESO
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I will take it in and have AutoZone check it port 4 and 16 are good 16 hot key off 4 good ground .
Jun 27, 2021 at 8:11 AM
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ASEMASTER6371
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AutoZone sells parts. They are not technicians.

Just check and see if they can connect and their scan tool powers up.

Roy
Jun 27, 2021 at 8:15 AM
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DEQUESO
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Okay, I will be near one next week. will be in touch. thank you
Jun 27, 2021 at 8:42 AM
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ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
Jun 27, 2021 at 8:43 AM
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DEQUESO
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I went and had OBD port checked with 2 different scanners still no power. The cigarette lighter fuse feeds the OBD so when I checked the main cigarette lighter had power 2 aux lighter had no power the fuses are under the dash. l will get around 2 pulling them later. do you think possible short or can they just blow over time????
Jun 29, 2021 at 12:19 PM
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ASEMASTER6371
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There is either a wiring harness issue or a short. Make sure the lighter is not shorted internally. Disconnect it and check for power to the fuse.

Roy
Jun 29, 2021 at 3:13 PM
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DEQUESO
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Okay, asap thank you, be in touch.
Jun 29, 2021 at 3:29 PM
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DEQUESO
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Traced problem blown 25 amp fuse which is the aux power. 2 check 4 short I took my test light disconnected positive post clipped my test light 2 positive cable put the other 2 positive post light came on. This must power 2 aux cig lighter which didn't work. If I put a fuse in will pop?? How would go about trying 2 trace wire???
Jun 30, 2021 at 2:13 PM
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ASEMASTER6371
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Put the fuse in it. I would disconnect the wire behind the power port and see if it holds.

Roy
Jun 30, 2021 at 3:59 PM
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DEQUESO
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What do you need 2 release the wire?
Jun 30, 2021 at 4:30 PM
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ASEMASTER6371
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It should just pull off.

Roy
Jun 30, 2021 at 4:33 PM
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DEQUESO
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We fixed the code problem bad fuse replaced holding. My OBD works new prob. It states a fault in bank 2 sensor 1.? Is where is it located and how many????
Jul 2, 2021 at 10:57 AM
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ASEMASTER6371
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I found additional information on the data link connector. I attached them below for you to view.

Roy
Jul 2, 2021 at 12:05 PM
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ASEMASTER6371
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As far as the other issue, we can deal with one issue per question.

Please start a new question and I will be able to answer you on that issue. Please include the code number in your question.

Roy
Jul 2, 2021 at 12:06 PM
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DEQUESO
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Okay.
Jul 2, 2021 at 12:17 PM
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ASEMASTER6371
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I will be watching for it.

Roy
Jul 2, 2021 at 12:50 PM