ABS can bus scope

Aly Diagnostician Congo City, Congo Posted   Latest   Edited  
Question
Braking
Network Communications
2011 Jeep Grand Cherokee Overland 5.7L (T EZH) 5-spd (545RFE)
Lost Communication With Abs Module

Hi,

plz take a look on the video attachment for the can scope reading at abs module,and tell me if the signal is normal.

thanks

0
Randy Diagnostician
Glendora, California
Randy Default
 

You need to zoom in on your capture

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Eric Mechanic
Chapel Hill, North Carolina
Eric Default
 

Yep. Shorten your time base to maybe 5 or 10ms per devision. You first capture seems to have only one trace.

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Ok i will do

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Randy Curriculum Developer
Raleigh, North Carolina
Randy Default
 

Also separate the traces a bit so they don't overlap.

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Albin Diagnostician
Leavenworth, Washington
Albin Default
 

If you post up the Pico file, others can zoom it and do what is needed to see the needed data

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Todd Mobile Technician
Morinville, Alberta
Todd Default
 

I don't think its a Pico Albin.

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Hi, its maxiscope .

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Ok

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Aly Diagnostician
Congo City, Congo
Aly Update
 

Hi again, another attachment for the Abs can bus ,plz i need to know if it is normal ,we already order 4 abs modules each works for sometimes and we get communication with it ,then suddenly we lost communication again it look like the ecu communication circuit damaged. plz i need help to solve this issue . this is my email :…

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Todd Mobile Technician
Morinville, Alberta
Todd Default
 

It's not the greatest capture but it is definitely funky looking. Could you either zoom in on it or take it at a much shorter time base so we can look at the integrity of the 2 bus legs? Like a 200 Microsecond screen, + - 5 volts.

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Chris Diagnostician
Bryans Road, Maryland
Chris Default
 

Have you scanned all the modules? Is U0121 the only code you have in all of the modules? Have you checked and load tested the powers and ground at the ABS module when you have no communication? Its safe to say its probably not the ABS module if you have replaced 4 of them with the same issue. In your newer scope picture you still need to zoom in some more. I would also check pin tension and do a…

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Aly Diagnostician
Congo City, Congo
Aly Default
 

HI CHRIS. YES U0121 is the only fault on others modules;i have checked the power and the ground many times when no communication. on scope capture i check can high pin 5 and can low pin 6 on abs connector. as i post again when i was replaced the new modules i get communication and i do configuaration of the module and all works good,but after some hours i come back to car i find that i lost…

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Chris Diagnostician
Bryans Road, Maryland
Chris Default
 

Ok I would check pin tension on the powers and grounds and comm lines at the abs module. Maybe try wiggling the ABS connector/harness and see if communication will come for any time. Has the TIPM been replaced on this car? Any other history on this car ? Did this problem just come up out of no where?

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Aly Diagnostician
Congo City, Congo
Aly Default
 

hi again yes i find another tipm on the car that Customer told me that it was replaced due to fuel pump relay problem,i instal it but still abs not communicate. As i told you before i check tension power and ground many times ,i try also wiggling the abs connector but still not communicate : As i post before, when i instal new module i get communication with it,i do progamming without any…

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Randy Diagnostician
Glendora, California
Randy Default
 

Start disconnecting every thing that abs controls . Like wheel speed sensors but I would disconnect vacuum pressure sensor first

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Anthony Technical Support Specialist
Kirkwood, Pennsylvania
Anthony Default
   

Hi Aly: Take what I'm about to say with a grain of salt. I only use the OEM tool on these and don't know if your tool is accurate, in this …e. You have all of the hallmarks of a failing TIPM. I don't know anyone who has successfully installed a donor TIPM in a vehicle which requires "TIPM registration". (I'm not saying that it can't be done. I'm saying that I don't know anyone who has done…

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Todd Mobile Technician
Morinville, Alberta
Todd Default
 

You don't have to program the ABS module on those, you just need to perform an ABS Initialization routine with a capable scan tool. Lets take it from the top. You are saying that intermittently you have a communication issue with the ABS module, correct? This results in the ABS and/or the ESP light being illuminated, correct? And this is what the customer notices, correct?

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Hi , 1-yes we do initialization routine by autel maxisys tool. 2-car come to our shop with abs and esp illuminated and scanner can not communicate with Abs module.i open the trunk i find 4 new ABS modules and 1 tipm that it was replaced by another shop trying to solve the communication problem with abs without success and they told customer that all the new ABS was damaged due to unknown…

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Randy Diagnostician
Glendora, California
Randy Default
 

Did you check for ac ripple on power feeds.

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Hi randy, no I did not check for ac ripple on power feeds; but I check ground to chassis it is connected properly,power supply not have a short and its fuses amp is same as required,I check all wires for the sensors that enter to ecu it no have short circuit, plz advice thanks

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Aly Diagnostician
Congo City, Congo
Aly Update
 

Hi again, In related to abs communication problem on the jeep: I measure the resistence on can bus C between can+ and can-, it give 54 ohms .is this means that i have a short circuit to can lines????? its possible that can + and can- lines if have problem damage the abs module????????!!!!!!!!!!! YOU CAN LOOK TO CAN BUS C CIRCUIT ON ATTACHMENT! I RECEIVE ANOTHER NEW ABS MODULE BUT I AM AFRAID TO…

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Randy Diagnostician
Glendora, California
Randy Default
 

Did you. zero your meter ????

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Yes

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Randy Diagnostician
Glendora, California
Randy Default
 

Are you checking with abs module plugged in .

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Yes randy ,i check it several times.

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Randy Diagnostician
Glendora, California
Randy Default
 

Disconnect battery and recheck

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Randy Diagnostician
Glendora, California
Randy Default
 

Are replacing just abs module or the hole unit ?????

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Randy Diagnostician
Glendora, California
Randy Default
 

And with what tool did you check power and grounds ???

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Multimeter

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Randy Diagnostician
Glendora, California
Randy Default
 

You can not check with a meter you have to load circuit. What kind of test light do you have

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Which test light i should use?!

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Randy Diagnostician
Glendora, California
Randy Default
 

what do you have

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Randy Diagnostician
Glendora, California
Randy Default
 

So you do not have a good test light either ??? That's ok you can make your own get a old tail light harness and cut the socket out of it for the brake light bulb . And putt connectors on it this should load your circuit and see if bulb stays bright

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Aly Diagnostician
Congo City, Congo
Aly Default
 

I should connect it to ground and power of the abs connector?!

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Randy Diagnostician
Glendora, California
Randy Default
 

No you need to test the ground and power sides separate . First check powers at connector with one side of test light and the other hooked to ground at battery and see how bright light is . Next check ground on connector now hook to positive cable and see how bright light is .

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Ok

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Randy Diagnostician
Glendora, California
Randy Default
 

You can use our scope to measure voltage drop on circuit butt you probably do not now how to do that . Training a lot of great you tube channels for learning tecks . I will try to call you tomorrow . Watch some videos tonight

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Randy Diagnostician
Glendora, California
Randy Default
 

Go to you tube and in search bar type in test light .

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Abs module only,we check pump it not stuck it function normally

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Randy Diagnostician
Glendora, California
Randy Default
 

And how much amperage is pump pulling

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Aly Diagnostician
Congo City, Congo
Aly Default
 

how i can check i should actuate it Externally ?!

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Randy Diagnostician
Glendora, California
Randy Default
 

Does it use a separate fuse for the pump

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Yes

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Randy Diagnostician
Glendora, California
Randy Default
 

Find your power and ground feed in abs connector for pump run them direct to battery and see what pump is drawing for amperage . You do have a amp clamp right

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Aly Diagnostician
Congo City, Congo
Aly Default
 

This is circuit diagram for abs module

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Randy Diagnostician
Glendora, California
Randy Default
 

Check can lines on another module in same network

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Aly Diagnostician
Congo City, Congo
Aly Default
 

It 54ohms on each module on can bus C

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Randy Diagnostician
Glendora, California
Randy Default
 

You should be ok you can communicate with other modules right

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Randy Diagnostician
Glendora, California
Randy Default
 

What brand meter are you using

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Its not an orginal multimeter but i use it normally on many measure purpose normally

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Randy Diagnostician
Glendora, California
Randy Default
 

What brand ???????? Who makes it

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Aly Diagnostician
Congo City, Congo
Aly Default
 

China

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Randy Diagnostician
Glendora, California
Randy Default
 

Throw it away and buy a good meter .

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Yes ,i can communicate with others modules.

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Randy Diagnostician
Glendora, California
Randy Default
 

Not a can bus issue . If you had a problem with can lines going to abs module or module it self you would not be able to comm to other modules

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Aly Diagnostician
Congo City, Congo
Aly Default
 

Hi randy, this is my whatsapp number … can you give me live assistance tomorrow to check power supply of abs again?!

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Randy Diagnostician
Glendora, California
Randy Default
   

What time my time do you start work ??? And go to you tube to night and check out scanner danner checking power and grounds. sounds like you need a little training . he is a good teacher

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Randy Diagnostician
Glendora, California
Randy Default
 

How did your testing. come out

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