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Old 04-05-2016, 03:45 PM   #2
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,606
 

2003 L-Series 3.0L Sedan
Default Re: ABS Light on but no OBDII Codes found

1-Generic low cost readers are basically designed to read emissions errors, 'P' type codes like P0341, P0300, P0422, etc.. Most low cost readers will not decode many other error codes with prefixes; 'B', C', 'U', and 'N'. ABS error codes are 'C' type. Google 'ABS error codes' for a general list that aren't read by most readers. You may be in luck if your local Autozone has the newer updated reader capable of reading abs error codes. Call or visit one if you have one nearby as other members just started reporting their Autozone's are now reading abs error codes.

2-The previous owner is more or less correct. ABS faults basically falls into three areas that are all external to the abs control module sitting next to the brake master cylinder and protected in the engine bay; all external wiring from abs module to each wheel, the wheel speed sensors and the reluctor (the toothed steel ring used to help generate timing signals from each wheel speed sensor).

Having a reader decode abs errors narrows down the problem immensely otherwise it can be as simple as a visual inspection of each wheel where the wiring, wheel speed sensor and reluctor are mounted. Some parts are hidden in some models while all parts are visible in other models. Damaged reluctors are usually cracked or missing altogether. Wheel speed sensors are damaged, bent in their brackets or out of range/dead (ohm resistance). Wiring from the abs module to each wheel speed sensor can be obvious when inspecting where wiring is tied/clamped.

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