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I have a 2003 Nissan Frontier 2WD 2.4L 110000 miles with an interesting ABS issue. If I hit a significant bump with the rear wheels, the ABS warning light will come on. However, when I stop and restart the truck, the ABS light will go off. The one time I was able to get a code from the ABS, it was pointing to an abnormal ABS signal. I’ve tried to recreate the condition by moving the harness around (the rear ABS sensor goes around the pinion shaft going into the rear drive, see the attached FSM page) and by tapping the ABS sensor. However, I think the drive shaft would need to be turning to pick up any issue with the ABS signal. I’ve looked at the wiring for cracks, etc., but have found none. I removed, cleaned and used bulb grease on the connections with no luck.
Any thought on this? I’m hoping it’s not the ABS sensor, because (as you see from the attached FSM snapshot) it requires a final drive overhaul to replace the ABS sensor because of the collapsible spacer (thanks Nissan engineers).
Thanks
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What code was that you got? Check that the grounds are clean and tight. If your getting
a code for this sensor and you checked connections. I would have to replace the sensor.The code was a C1115 out of Nissan Consult II diagnostics (Wheel sensor input is abnormal). It’s just puzzling that it goes away on a restart of the engine and the ABS works.
I guess I may need to prepare to pull the rear end apart and spend a couple of hours trying to get the shims aligned correctly…
I would look around much more before I pulled the rear end apart (unless you have experience doing that)…. You have to set it back with proper preload… recommend you at least watch some youtube videos on rear ends and how to achieve proper torque and what part(s) you may have to replace (and know what the preload is as well as have he torque wrench to check it).
-Karl
Thanks Karl. I have (unfortunately) had the experience of doing a couple of rear ends. I’m going to look more this weekend before I commit to a big job, or given I have a workaround, I may live with it until it gets bad enough to be a consistent failure.
ABS SENSOR [ABNORMAL SIGNAL] [C1115]
Malfunction detecting condition – Wheel Sensor (shorted sensor circuit)This seems to be an electrical fault as opposed to a sensor fault. Check to make sure that there isn’t any chafed or damaged insulation on the wiring such that when you hit a bump a certain way it causes the wiring to pinch or touch creating a short-circuit.
For those of you that are curious, it is fixed. I looked at the entire harness and it was all OK. Given I could not find any electrical issue, I turned to technology to finally solve it.
I strapped my GoPro camera to the frame of the truck and focused on the ABS sensor then went for a drive. Went over a very rough railroad crossing and immediately triggered the issue. Looked at the video and the magnetic pickup part of the sensor that slides into the carrier jumped up about half an inch and the gradually settled back into place as I hit other bumps. Turns out that there is a bolt that was missing that holds the sensor in the carrier. Got the right bolt and locked it down, and no issue on a drive on every rough road I know of in the area. My feeling is that the bolt was missed or not fully tightened when I took the truck to a shop a couple of years ago for a pinion seal that I didn’t have time to do myself. The sensor is a tight fit without the bolt so it just eventually worked it’s way loose.
Sometimes it just something really simple. Thanks all for your input.
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