2010 Civic

Andy Diagnostician Ontario Posted   Latest  
Unsolved
Braking
2010 Honda Civic EX-L 1.8L (R18A1) — 2HGFG1B03AH000825
Abs/Vsa Activation Intermitantly When Braking

Good morning everyone I hope you all enjoyed your time off. I am working on this civic that activates both rear inlet solenoids when braking from about 70km. It isn't very consistent thus making it difficult to track down. I have scoped all the wheel sensors when it happens and no irregularities are found during activation. From what I have read the inlet valves open in response to perceived low braking power. This car has had all brakes replaced and the abs unit(other shop). I'm trying to rule out a misreading yaw rate sensor or similar. All tires are identical and summer set did the same thing. If any one has any light to shed it would be appreciated.

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Saifullah Diagnostician
Ontario
Saifullah
 

When it activates, do you lose communication to the ABS unit? Monitor yaw sensor data on level surface.

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Andy Diagnostician
Ontario
Andy
 

No I do not lose com. But you did bring up a good point. Above 50km it kicks us out and the problem is most readily duplicated braking from 70km just to make matters more interesting.

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Saifullah Diagnostician
Ontario
Saifullah
 

Getting kicked out while ABS is activated is normal.

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Saifullah Diagnostician
Ontario
Saifullah
 

Check for high resistance in speed sensor harness wiring. Run overlays, load wires etc.

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Frank Owner/Technician
Ontario
Frank
 

Hi Andy, hope all is well! I assume there are no codes, in any module, pending or stored? I agree getting ‘kicked’ out at speeds above 50km is sadly normal - does make for a more interesting path to diagnosis. To the best of your knowledge has this car been in an accident? You clearly stated that you've scoped the speed sensors during activation with no anomalies found. I would ask that…

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Andy Diagnostician
Ontario
Andy
 

Hey Frank I hope you had a great holiday. I have a feeling this issue is due to incorrect information from either sas or yaw rate. It never happens at low speeds or during aggressive corner braking. This post was a last ditch effort I dont think this customer will spend anymore. She looked at me like I had two heads when I told her this might be a difficult diag. Even though the mechanic she…

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Andrew Owner/Technician
Australia
Andrew
 

Hi Andy, we had a Mitsubishi Triton that did a similar thing, you have probably already done this but make sure the steering angle sensor is ok and reading correctly. The issue we had was that ABS would activate if you where going at 80 Klm or over and braked even lightly. This particular vehicle did not log any codes and all sensors and systems were fine, it just thought it was trying to turn…

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Helpful
Interesting
Andy Diagnostician
Ontario
Andy
 

Yes Andrew I had come to that conclusion as well. Either the yaw rate sensor isn't showing the deceleration or its getting a funny sas. Only issue neither can be viewed above 50km which is when it mostly happens as rare as it does. but yea the sas is good when I read it at 50 and below

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