No communication

Tiny
DEQUESO
  • MEMBER
  • 2003 CHEVROLET ASTRO
  • 2.4L
  • V6
  • 4WD
  • 78,000 MILES
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?
Do you
have the same problem?
Yes
No
Saturday, June 26th, 2021 AT 12:28 PM

20 Replies

Tiny
ASEMASTER6371
  • EXPERT
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
Was this
answer
helpful?
Yes
No
+1
Saturday, June 26th, 2021 AT 3:56 PM
Tiny
DEQUESO
  • MEMBER
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?
Was this
answer
helpful?
Yes
No
Sunday, June 27th, 2021 AT 8:00 AM
Tiny
ASEMASTER6371
  • EXPERT
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
Was this
answer
helpful?
Yes
No
+1
Sunday, June 27th, 2021 AT 8:04 AM
Tiny
DEQUESO
  • MEMBER
I will take it in and have AutoZone check it port 4 and 16 are good 16 hot key off 4 good ground.
Was this
answer
helpful?
Yes
No
Sunday, June 27th, 2021 AT 8:11 AM
Tiny
ASEMASTER6371
  • EXPERT
AutoZone sells parts. They are not technicians.

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

Roy
Was this
answer
helpful?
Yes
No
+1
Sunday, June 27th, 2021 AT 8:15 AM
Tiny
DEQUESO
  • MEMBER
Okay, I will be near one next week. Will be in touch. Thank you
Was this
answer
helpful?
Yes
No
Sunday, June 27th, 2021 AT 8:42 AM
Tiny
ASEMASTER6371
  • EXPERT
You are welcome.

Always glad to help.

Roy
Was this
answer
helpful?
Yes
No
Sunday, June 27th, 2021 AT 8:43 AM
Tiny
DEQUESO
  • MEMBER
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?
Was this
answer
helpful?
Yes
No
Tuesday, June 29th, 2021 AT 12:19 PM
Tiny
ASEMASTER6371
  • EXPERT
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
Was this
answer
helpful?
Yes
No
Tuesday, June 29th, 2021 AT 3:13 PM
Tiny
DEQUESO
  • MEMBER
Okay, asap thank you, be in touch.
Was this
answer
helpful?
Yes
No
Tuesday, June 29th, 2021 AT 3:29 PM
Tiny
DEQUESO
  • MEMBER
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?
Was this
answer
helpful?
Yes
No
Wednesday, June 30th, 2021 AT 2:13 PM
Tiny
ASEMASTER6371
  • EXPERT
Put the fuse in it. I would disconnect the wire behind the power port and see if it holds.

Roy
Was this
answer
helpful?
Yes
No
Wednesday, June 30th, 2021 AT 3:59 PM
Tiny
DEQUESO
  • MEMBER
What do you need 2 release the wire?
Was this
answer
helpful?
Yes
No
Wednesday, June 30th, 2021 AT 4:30 PM
Tiny
ASEMASTER6371
  • EXPERT
It should just pull off.

Roy
Was this
answer
helpful?
Yes
No
Wednesday, June 30th, 2021 AT 4:33 PM
Tiny
DEQUESO
  • MEMBER
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?
Was this
answer
helpful?
Yes
No
Friday, July 2nd, 2021 AT 10:57 AM
Tiny
ASEMASTER6371
  • EXPERT
I found additional information on the data link connector. I attached them below for you to view.

Roy
Was this
answer
helpful?
Yes
No
Friday, July 2nd, 2021 AT 12:05 PM
Tiny
ASEMASTER6371
  • EXPERT
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
Was this
answer
helpful?
Yes
No
+1
Friday, July 2nd, 2021 AT 12:06 PM
Tiny
DEQUESO
  • MEMBER
Okay.
Was this
answer
helpful?
Yes
No
Friday, July 2nd, 2021 AT 12:17 PM
Tiny
ASEMASTER6371
  • EXPERT
I will be watching for it.

Roy
Was this
answer
helpful?
Yes
No
Friday, July 2nd, 2021 AT 12:50 PM

Please login or register to post a reply.

Sponsored links