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Discussion Starter #1
So the latest bug in the system is a curious one. Whilst driving 2 weeks ago the ABS/ESP/BAS and handbrake warnings lights came on. As the self test is real time, the lights go off when the vehicle is shutdown and restarted. When the vehicle speed gets to around 12 mph the lights come on again, this was telling me something was possibly faulty.

keeping a cool head, I connected my ‘ThinkDiag’ scan tool to iPhone and dig into the chassis codes. This pulled up a C2200 ABS module internal fault code. Other peripheral components could trigger the code, so I started the usual rat run testing all WSS’s first by disconnecting each and testing resistance, each came back with between 477kohms and 484kohms. Testing each supply harness gave me between 11.8 and 12.3 volts. The odd thing here is youtubers say you can spin the wheel and generate AC voltage for testing when the WSS us disconnected...we’ll this didn’t work on any of them...not sure why.

so another way of testing the sensors was to record live data through the scan tool by selecting all four sensors in the software then drive it fir a bit. This proved all four were working and reporting wheel speeds to the ECU, there were slight variations between wheels as expected as wheels do not rotate at identical speeds when turning left and right. The good news was confirming they were all operational.

All brake pads were replaced and each corner burped to remove any resident air, the ABS module was also activated confirming at jest the pump was operational.

this was the limit of what I could realistically do on the driveway, so now fearing the electronic module attached to the hydraulic abs block might now be bad as per the C2200 code I booked it in to an ABS specialist locally who has Chrysler scan gear. Fortunately that appointment is a week away...because whilst driving it today the lights have all mysteriously gone off and tested as no codes present, no more C2200 on the scan tool.

if it was a bad module it would not sort itself out, so fairly sure I have an intermittent problem somewhere else, who knows, or the work I did led to a fault correcting itself after driving.

Either way, for now we’re good to go.

This may help others who pull a C2200 code, don’t assume it is the ABS module. The scan tool I use is a ‘ThinkDiag’ plug in costing a £100, connected to an IPhone by Bluetooth with the Chrysler software download if anyone’s interested.
 

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Discussion Starter #2
Update:

the warning lights have remained silent for now which is good news (for now). knowing how prone to electrical gremlins my Nitro is, I wouldn’t be surprised if they come back on at some point.

to try to find the potentially intermittent fault, I removed all four sensors and gave them a good clean. I also checked all harness connectors which in my mind is a weak spot. The front left connector was wet, and with what looked like coolant dry whitish residue on it. It could be that when I cleaned this up I cleared the problem as this was the only issue I could find.

as the why this connector was wet with no rain for a week, we then move to what was sitting above in in the engine bay. The LPG fuel pressure reducer is bolted To the side inner wing, this has a coolant flow and return loop attached coming from the cabin heater connectors in the bulkhead. One if these was weeping coolant which has obviously run down the harness which feeds through to the WSS connector mounted directly below on the wheel arch inner splash guard.

this might be the indirect cause...onky other thing I can think of is metal or rust particles from a tone wheel fouling one if the sensors
 

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Discussion Starter #3
...sorry about the typos I’ve got iPhone incompatible fat fingers 😳
 
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