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Hi All,
Thank you to all who have helped me find the appropriate connectors and wiring to investigate this fault. As expected, all the lights on the dash for ABS, stability control, driving modes, etc., are all faulting. I made progress, but still haven't fully solved this.
I used Forscan to discover an open circuit on the front right wheel speed sensor. I initially just replaced the sensor, but damaged the old one during removal. With the new sensor, the issue persists.
This past weekend, with more information, I examined the wiring and found that the harness behind the inner fender had been chewed by mice. The damage occurred after intermediate connector C1137 on the harness that feeds the wheel speed sensor and other components, such as the front diff lock. The damaged wires were a twisted pair, with the low-side sensor wire completely severed. The power wire was damaged but remained intact.
I repaired the wires using 20-gauge wire, replicating the twist as best as I could. I soldered and shrink-wrapped the wires. I consider myself fairly capable with this, and believe I made a solid repair. I measured 0.6 ohms of resistance from the speed sensor connector to the ABS module connector pin.
Even after this repair, I am still getting a code for insufficient wheel speed sensor transitions. Back to the drawing board, I measured the voltage across the speed sensor. With the engine off and key on, it measures about 11.3V, indicating that the ABS module is providing power to the sensor. However, when I spin the tire, I don't see any voltage fluctuation. I suspect the new sensor I installed may have been damaged because I hadn't fully corrected the wiring yet. That's my hope, at least.
There was a large mouse nest in the inner fender well, near the bottom of the door. I noticed missing pieces on the pad around the battery when I removed it and suspected a mouse, and found it all in this nest.
Thank you to all who have helped me find the appropriate connectors and wiring to investigate this fault. As expected, all the lights on the dash for ABS, stability control, driving modes, etc., are all faulting. I made progress, but still haven't fully solved this.
I used Forscan to discover an open circuit on the front right wheel speed sensor. I initially just replaced the sensor, but damaged the old one during removal. With the new sensor, the issue persists.
This past weekend, with more information, I examined the wiring and found that the harness behind the inner fender had been chewed by mice. The damage occurred after intermediate connector C1137 on the harness that feeds the wheel speed sensor and other components, such as the front diff lock. The damaged wires were a twisted pair, with the low-side sensor wire completely severed. The power wire was damaged but remained intact.
I repaired the wires using 20-gauge wire, replicating the twist as best as I could. I soldered and shrink-wrapped the wires. I consider myself fairly capable with this, and believe I made a solid repair. I measured 0.6 ohms of resistance from the speed sensor connector to the ABS module connector pin.
Even after this repair, I am still getting a code for insufficient wheel speed sensor transitions. Back to the drawing board, I measured the voltage across the speed sensor. With the engine off and key on, it measures about 11.3V, indicating that the ABS module is providing power to the sensor. However, when I spin the tire, I don't see any voltage fluctuation. I suspect the new sensor I installed may have been damaged because I hadn't fully corrected the wiring yet. That's my hope, at least.
There was a large mouse nest in the inner fender well, near the bottom of the door. I noticed missing pieces on the pad around the battery when I removed it and suspected a mouse, and found it all in this nest.
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