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Ok guys, need some help.

2005 WRX ABS on constant at ignition. No flashing on or off.. just stays on.

OHM tested all sensors ..OK

Swapped ABS pump.. OK

Vehicle had a a turbo gauge as well as a turbo timer installed from previous owner. No idea if this is a direct cause or not.

Any and all help would be appreciated!!!
 

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have you had somone pull the code? ohm testing a sensor doesn't really tell you if its good or not, there is a spec for most vehicles on checking the switching voltage w/ a certain wheel rotation, also inspect the abs rings themselves for damage or improper gap, although I own a wrx i have never had to work on the abs system, i am very familiar on how they all work, wrx use a 2 or 3 wire sensor? if its a 2 your looking for a/c 3 wire dc voltage.
 

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I am not sure what the spec is on a wrx but for instance a typical abs sensor (2 wire) has typically 1 volt of ac when the wheel is spinning typically 1 revolution per second, you would want to check this voltage w/ the sensor connected by back probing any connector between the sensor and the module, I don't have a subby WSM handy, but I know for instance ford WSM's have this spec available in the ABS section. Also a chipped or missing tooth, or improper gap can cause this light. Unfortunately a 2 wire sensor means its a VRS sensor (variable reluctance sensor) and is very susceptible to improper gap and tooth imperfections, a 3 wire (hall effect) is much harder to effect... but obviously subby didn't use it.
 
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