Low Trac Light from 60-65mph after rear end swap...
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Low Trac Light from 60-65mph after rear end swap...
Hello,
I recently swapped out my 10bolt rear end for a MWC Fab 9. I had the rear end narrowed 3" per side, so I had to bend the **** out of my brake lines for them to fit for now. I know thats a halfass way, but will be installing shortened lines soon. So my question is, what would cause my low trac light to come on going 60-65mph on the highway? The gears were only increased from 3.42's to 3.50's. Also, I have 3" wheel adapters on right now since my 3pc wheels are not finished being built.
Any help would be great!
thanks!
I recently swapped out my 10bolt rear end for a MWC Fab 9. I had the rear end narrowed 3" per side, so I had to bend the **** out of my brake lines for them to fit for now. I know thats a halfass way, but will be installing shortened lines soon. So my question is, what would cause my low trac light to come on going 60-65mph on the highway? The gears were only increased from 3.42's to 3.50's. Also, I have 3" wheel adapters on right now since my 3pc wheels are not finished being built.
Any help would be great!
thanks!
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it depends. are you running the factory wheels and tire size? if so i would look into the airgap on the wheel speed sensors and reluctor rings if its a 4chn rear. eric at mwc is a good guy he will help you out if you cant figure it out.
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if it is a four chn car then no. at least not in my book. you have to grind out the new housing ends or the backing plates. neither are the right way. use a feeler gauge and let us know what the air gap is between the sensors and the reluctor rings. if i remeber correctly i think it is going to be between 40-50 thousands.
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I'm sorry I wish I would of seen this before I left the shop. I would of got you all the proper measurements you needed. I might be swinging in their tomorrow because we have a ton of stuff going on I will look it up and get back to you, other wise i will call Eric and have him get the measurements you need.
Last edited by MidwestChassis; 12-17-2010 at 09:14 PM.
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Distance from the back of the wheel studs to the ring is around 60-80 thousands and the sensor to the ring is 45 thousands.
Something that popped into my head that can be causing an issue is this right here as well.
I would get your new wheels on with out the spacers and see if that changes anything.
Something that popped into my head that can be causing an issue is this right here as well.
I have 3" wheel adapters on right now
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if it is a four chn car then no. at least not in my book. you have to grind out the new housing ends or the backing plates. neither are the right way. use a feeler gauge and let us know what the air gap is between the sensors and the reluctor rings. if i remeber correctly i think it is going to be between 40-50 thousands.
Distance from the back of the wheel studs to the ring is around 60-80 thousands and the sensor to the ring is 45 thousands. Something that popped into my head that can be causing an issue is this right here as well.I would get your new wheels on with out the spacers and see if that changes anything.
thanks!
I will check this also, but pretty sure they are on the correct side of the car as I labeled them.
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Okay so I finally got my new wheels on with the correct backspacing. After driving the car with no wheel adapters, I am still getting the low trac light. Another light has been coming on since I have started to drive the car again. So the low trac light comes on and off but only at highway speeds, once I am driving for around 10 minutes on the highway the ABS inop light comes on..... I am getting hptuners by the end of the month and will calibrate the gears, and Im checking the air gaps tomorrow. If these two things dont work, what would be the solution Midwest?
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I had sort of the same problem when I did my s60 swap with 4:10s. My traction control would come on when I stepped on the brake pedal. The sensors for the traction control are magnets and a bunch of crud stuck to them during the swap. Cleaned them off and everything was fine. Its worth the check..
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Check the air gap, recalibrate for the tire height and gear change, check to make sure a sensor didn't go bad, make sure the sensors are plugged in all the way, and making sure they are clean is also another good option.
The backing plates, reluctor rings, and sensors are all units that came off your vehicle. The housing itself doesn't dictate anything to do with TCS, how ever gear ration can as well as tire size.
The backing plates, reluctor rings, and sensors are all units that came off your vehicle. The housing itself doesn't dictate anything to do with TCS, how ever gear ration can as well as tire size.
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This is what they measure:
-Distance from back of the wheel stud to the ring is:
driver side: 0.035"
passenger side: 0.040"
-Distance from the sensor to the ring is:
driver side: 0.080"
passenger side: 0.065"
Looks like the gaps are way out of spec unless your got your measurements backwards?
here are pics of what I was measuring, these pics are of the driver side.
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okay, but how is that relevant for the traction control system to work correctly when the important gap is the distance from the reluctor ring to to sensor?
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So I just re-calibrated the tire size and gear ratio and still getting the low trac light at highway speeds. Here are the codes that came up:
[Brake] C0046 - Brake Pressure Sensor A/B (History)
[Brake] U1000 - Class 2 Communication Malfunction (History)
[Brake] C0245 - Wheel Speed Sensor Frequency Error (History)
[Restraints] U1000 - Class 2 Communication Malfunction (History) (Immature)
[Restraints] U1016 - Loss of Class 2 Communication with VCM (History) (Immature)
[HUD] U1000 - Class 2 Communication Malfunction (History) (Immature)
Any idea? Ill check the flange to ring gap this week and get back...
[Brake] C0046 - Brake Pressure Sensor A/B (History)
[Brake] U1000 - Class 2 Communication Malfunction (History)
[Brake] C0245 - Wheel Speed Sensor Frequency Error (History)
[Restraints] U1000 - Class 2 Communication Malfunction (History) (Immature)
[Restraints] U1016 - Loss of Class 2 Communication with VCM (History) (Immature)
[HUD] U1000 - Class 2 Communication Malfunction (History) (Immature)
Any idea? Ill check the flange to ring gap this week and get back...
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It doesn't look like it is communication with the sensor, bad sensor, frayed wire, sensor not bolted in square with the backing plate, grease or debris on the ring or sensor itself, voltage and reference test at each sensor find the abnormal reading and make sure your rotor isn't bent or the pads grabbing.