ABS question
Posting Guru
Joined: Apr 2003
Posts: 1,153
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From: Venezuela
Truck's ABS General Information...
Well, we need some clarifications on this post:
1º The speed sensor was located at tranny output until 1991, from 1992 to 1996 it is located in the rear axle and is shared with ABS
2º The speed sensor is connected in parallel to ABS or RABS computer and Instrument cluster (Speed meter), which also send a modified speed signal to PCM.
3º The error codes to be read, comes from ABS/RABS computer, it has a simple wire and connector, has to be grounded to obtain flashing codes from Yellow ABS light. This codes are available only when the Yellow ABS light is on. Those codes are not stored in any memory, should be read before turn off engine. While the Yellow ABS light is on, the ABS system is disable.
4º The RABS valve is located on left frame just under drivers. I have never seen an ABS valve on Bronco's but I guess it was installed right beside to Master Cylinder.
5º A yellow ABS light mostly identify electrical problems between ABS/RABS computer and valve.
6º Error codes are just a number from 2 to 14, numbers 1 AND 15 are not valid codes. Computer only diagnose one code at time, if several error codes are present, should be diagnose and corrected one by one.
1º The speed sensor was located at tranny output until 1991, from 1992 to 1996 it is located in the rear axle and is shared with ABS
2º The speed sensor is connected in parallel to ABS or RABS computer and Instrument cluster (Speed meter), which also send a modified speed signal to PCM.
3º The error codes to be read, comes from ABS/RABS computer, it has a simple wire and connector, has to be grounded to obtain flashing codes from Yellow ABS light. This codes are available only when the Yellow ABS light is on. Those codes are not stored in any memory, should be read before turn off engine. While the Yellow ABS light is on, the ABS system is disable.
4º The RABS valve is located on left frame just under drivers. I have never seen an ABS valve on Bronco's but I guess it was installed right beside to Master Cylinder.
5º A yellow ABS light mostly identify electrical problems between ABS/RABS computer and valve.
6º Error codes are just a number from 2 to 14, numbers 1 AND 15 are not valid codes. Computer only diagnose one code at time, if several error codes are present, should be diagnose and corrected one by one.
