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The abs and VSC engage briefly when changing lanes or

Customer Question
decelerating. JA: How many miles are...
The abs and VSC engage briefly when changing lanes or decelerating.
JA: How many miles are on the car? How has the car been handling lately?
Customer: All maintenance has been performed as scheduled. Tried putting new struts and an alignment...no change. The car has 153,600 miles.
JA: What year is your 600?
Customer: 2002 RX300 AWD
JA: Are you fixing your 600 yourself? What have you tried so far?
Customer: been trying to fix this car for 2 weeks
JA: Anything else you want the mechanic to know before I connect you?
Customer: not at this time
Submitted: 1 year ago.Category: Lexus
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Answered in 1 minute by:
10/20/2016
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago
David Craig
David Craig, Auto Mechanic
Category: Lexus
Satisfied Customers: 4,507
Experience: Owner/Mechanic at 3D Automotive
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Hi Im David, when this happens does the abs or trac light come on?

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Customer reply replied 1 year ago
The issue is intermittent. I can cause the issue by changing lanes and decelerating the vehicle while driving. Lights do come on briefly and the alarm goes off. No codes are generated. Seems like the car believes it is in a skid.
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

when you say no codes are generated are you interrogating the abs control module and not just the engine control module?

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Customer reply replied 1 year ago
only the abs control module. I have recorded all live data on my autel scanner. There is nothing indicating an issue with vehicle speed sensors or any other sensor. The Zero Yaw is reading -1 and does not change. All other values are accurate.
Customer reply replied 1 year ago
I have performed a zero calibration on the Yaw sensor. Did not correct the issue.
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

Have you monitored the abs system while driving and inducing the conditions?

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Customer reply replied 1 year ago
the computer does not indicate there is an issue. The only sensor I can not see is the acceleration/deceleration sensor.
Customer reply replied 1 year ago
There is a diagnostic test for this sensor that is kind of old school.
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

check the wiring at the abs control module. remove the connector and check for pin integrity and corrosion. also make sure the grounds for it are clean and tight.

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Customer reply replied 1 year ago
All wiring and grounds are good. Pins appear to be fine.
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

OK. let me see what else we can look at

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Customer reply replied 1 year ago
My technician wants to replace the ABS Control Module W/ Pump. We have now tested the Yaw Sensor and Acceleration/Decceleration Sensor. Both passed.
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

i was waiting to see if they tested good or bad.

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Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

what about testing or recalibrating the steering angle sensor

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Customer reply replied 1 year ago
any thoughts???
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

what about testing or recalibrating the steering angle sensor?

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Customer reply replied 1 year ago
I did that first...before any other work was performed. The Steering Angle Sensor is working and tested to specified voltages.
Customer reply replied 1 year ago
I have never seen a Lexus do this before. I know there are issues related to the steering angle sensor and yaw sensor correlation. Base on what we can see, the hardware is working the way it should. Is this a new problem for you?
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

very unusual indeed. its like the abs module is sensing a slipping motion. but changes lanes? the tires are all the same size i hope?

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Customer reply replied 1 year ago
The tires are all the same size. The front struts were pitching forward past 28 degrees and rolling over past 20 degrees. We replaced them with much improved numbers (10 - 18 degrees). Even still, the ABS thinks the car is skidding out of control when changing lanes.
Customer reply replied 1 year ago
Put some more thought into it for me. I know this is an unusual issue. I have ordered a salvage yard ABS module from a very reliable source. I am going to put the unit on when it arrives on Monday. If you can give me any other suggestions, it would be greatly appreciated.
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

i think i have a few more brain cells left. let me think about it.

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Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

I got nothin my friend.... did you replace the module yet?

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Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

hello?

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Customer reply replied 1 year ago
Waiting on the module to come in. I'll get back to you!
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

ok

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