OBD2 cannot connect

Tiny
POWERMOTORSPORTS
  • MEMBER
  • 2004 TOYOTA COROLLA
Computer problem 4 cyl Front Wheel Drive Automatic

Car get flooded, change a new ECU, but OBD scanner cannot connect and get codes?
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Thursday, January 21st, 2010 AT 10:17 PM

13 Replies

Tiny
KEN
  • ADMIN
There is an OBD fuse that I would check first, check out the wiring diagrams for the ALDL connector so you can see how the system works.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the fuse panel and ALDL wiring diagrams (Below)

Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
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Friday, January 22nd, 2010 AT 6:28 AM
Tiny
POWERMOTORSPORTS
  • MEMBER
OBD fuse is OK, check the power of OBD port is also OK, since OBD is directly connected to ECU for memory, I wonder why it does not respond since it is already new ECU. Check the lline an everything is ok
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Friday, January 22nd, 2010 AT 8:50 PM
Tiny
MMPRINCE4000
  • EXPERT
If diagnostic port fuse is OK, then it could be a loose/kinked/pulled wire to link. Scanner should power up when connected to port regardless of position of ignition switch. Does the dash light up when the key is on?
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Saturday, January 23rd, 2010 AT 8:17 AM
Tiny
POWERMOTORSPORTS
  • MEMBER
OBD port has several pins that I checked, I only have some based on the service manual. Like Power, GND, Signal GND. All these are OK we have 12 volts supply and to the ignition switch but not coming out so I replaced the switch and the car came back to life thanks for your help I love this site.
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Sunday, January 24th, 2010 AT 9:48 PM
Tiny
MMPRINCE4000
  • EXPERT
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help

Cheers
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Friday, January 29th, 2010 AT 5:23 AM
Tiny
NIXO22
  • MEMBER
Hello house, I just joined. I have the same ODB2 connection problem. I have a 2006 Toyota corolla and each time I tried connecting an ODB scanner to it, I always get an "error in connection". Where do I start from?
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Friday, February 23rd, 2018 AT 1:50 AM
Tiny
KEN
  • ADMIN
Hello,

Have you looked a the OBD fuse? 7.5 amp.

Check out the diagrams and guide in my above post and get back to me.

Cheers, Ken
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Saturday, February 24th, 2018 AT 12:50 PM
Tiny
NIXO22
  • MEMBER
Yes I did check the 7.5A fuse for OBD and the fuse was ok though I didn t test with a test indicator to confirm. The metal strip in the fuse was still intact.
However the round illuminating light around the cigarette jack does not come on when I switch on my lights.
I have both the ABS and Brake check light on in the dash.
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Sunday, February 25th, 2018 AT 6:37 AM
Tiny
KEN
  • ADMIN
There is a 30 amp fuse in the passengers fuse panel that powers all of the systems you have mentioned.

Use the post above to see how to find and test

Cheers, Ken
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Monday, February 26th, 2018 AT 11:57 AM
Tiny
NIXO22
  • MEMBER
Hi there, finally I was able to fix the Brake and ABS dash lights all by my self at $0 cost. I just checked the integrity of the connection from the 2 front ABS sensors to where they connect with the ABS unit. Both wires were sheared so I just did a thorough termination( had the two terminals of the battery taken out first before proceeding). Connected back the battery, started the car and BINGO all lights were off.

I think the very first things we should do when trying to troubleshoot such problems are to carry out visual inspections and look out for open lines.
Thanks for your wonderful suggestions.

Nixo.
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Sunday, March 4th, 2018 AT 8:18 AM
Tiny
KEN
  • ADMIN
Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
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Monday, March 5th, 2018 AT 10:36 AM
Tiny
NIXO22
  • MEMBER
My OBD port is still a problem. Cannot communicate with an OBD II scanner.
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Monday, March 5th, 2018 AT 10:56 PM
Tiny
KEN
  • ADMIN
I know you said you checked the OBD fuse and it was good but does it have power?

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please let us know what happens.

Cheers, Ken
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Tuesday, March 6th, 2018 AT 12:32 PM

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