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No communications with scan tools

Tiny
2HASCKAY
  • MEMBER
  • 2008 CITROEN C4
  • 1.6L
  • TURBO
  • 2WD
  • MANUAL
  • 240,000 MILES
Hello, I got a Citroen C4 Picasso, year 2008, 1.6 HDI
The problem is that the car does not communicate with Lexia, I had the job at it because I replaced the EGR and had to reinitialize it, but I decided to leave it tomorrow. The next day it started to rain and I forgot that I gave the wipers down and the wipers, the water came in to the engine fuse box, it had a protective cover that was installed. So I think the water could not get in. But why my car does not communicate with Lexia anymore? I have a few errors since the last diagnosis, but since then the car did not communicate with Lexia.
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Friday, April 5th, 2019 AT 7:04 AM

9 Replies

Tiny
JOETECHPRO
  • MECHANIC
  • 705 POSTS
Hey 2HASCKAY,

First step will be to check all of the fuses.

I do not have the information for your vehicle so cannot provide you with wiring diagrams unfortunately.

Check all fuses and let us know what you find.

Next is to check power/ground at the DLC connector (OBD2 port)

Instructions below, Pin 16 - battery positive, pins 4 and 5 ground.

Hope that helps.

Let me know if your fuses are ok and you have battery voltage pin 16 and good grounds on pins 4 and 5.

Regards, Joe
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Sunday, April 7th, 2019 AT 11:24 AM
Tiny
2HASCKAY
  • MEMBER
  • 6 POSTS
Hello my friend, how to know if my batery voltage from 16 and grounds on pin 4 and 5 are good? What voltage I need to see?
All the fuses hace been replaced, they are all good.
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Sunday, April 7th, 2019 AT 12:37 PM
Tiny
JOETECHPRO
  • MECHANIC
  • 705 POSTS
Hey 2HasckaY,

Testing for voltage with a multi-meter you should have battery voltage (12V approx)

With your multi-meter test for voltage with the black lead to the battery negative terminal and with your red lead at pin 16 on the DLC (OBD2 connector)

You should have 12 volts.

Then keeping your red lead on pin 16 move your black lead to pin 4 and then pin 5.

You should still have 12 volts with your black lead on these two points.

Let me know what you have.

Regards, Joe
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Sunday, April 7th, 2019 AT 3:44 PM
Tiny
2HASCKAY
  • MEMBER
  • 6 POSTS
I have measured volts and I have 13, 15V / 13, 16V / 13, 14V is around 13V. But the car electrocution me when I get off of it and this just when I put the key in the contact, I start and stop.
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Monday, April 8th, 2019 AT 6:48 AM
Tiny
2HASCKAY
  • MEMBER
  • 6 POSTS
This is the last errors from my scan tool before can't communicate with ECU.
Lexia or Diagbox can't communicate with ecu or anything else, but I don't know why, there are some errors from ecu like "ECu low supply voltage" or "Battery low supply voltage", but I don't know why? My battery have 12+ volts, the car electrocution me when i'm in and want to get out and touch the doors. (This is happening only when I start the car and then turn off) Somebody explain my how to do something, anything.
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Monday, April 8th, 2019 AT 1:49 PM
Tiny
2HASCKAY
  • MEMBER
  • 6 POSTS
Is somebody that can help me? Give me some steps, please, I need to know why scan tools doesn't communicate with the ECU.
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Tuesday, April 9th, 2019 AT 1:27 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Have you confirmed the scanner works in other vehicles, also have you checked the system fuses. It will be a connection problem or the ECU stopped working. Please let us know what you find. We are interested to see what it is.
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Friday, April 12th, 2019 AT 11:15 AM
Tiny
2HASCKAY
  • MEMBER
  • 6 POSTS
I test my Lexia on a Citroen Xsara, it s work, all the fuses have been replaced, also I used another tools scan, still not communicating, I send my ECU and BSI to somebody to check it so I can find what is wrong and if can repaired I will replay then to say what was the problem that causes this "no communications"
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Friday, April 12th, 2019 AT 11:20 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like you are on the right trail with the ECU. Please let me know.
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Saturday, April 13th, 2019 AT 11:04 AM

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