Thread: S40 (New) Electrics : - ECU fault maybe
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Old Jun 28th, 2021, 11:42   #7
moggycat
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Last Online: Feb 1st, 2022 15:55
Join Date: Jun 2020
Location: Thetford
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Originally Posted by moggycat View Post
Well I took the CEM apart and cleaned it. All contacts were good with no damage.
Apparently I have cooked the battery and need a new one.
I had left my side lights on and the battery went flat so had to jump start the car using a 2lt diesel ambulance which had an up rated alternator which produces a lot more Amps than my battery could take, so although the car started, my mechanic thinks that the battery got fried as it is not holding a charge now.
New battery on order, I'll update further as to if this solves the problem.
Well I fitted a new battery, car started and ran for about 30-45 seconds then stopped. All the dash warning lights and error messages came on prior to the engine stopping. Took the key out, put it back in and nothing, battery was showing approx 12.4v on my multi-meter but I've got no electrics, not even internal lights such as courtesy/foot well lights.

I think it might be a time for 5ltrs petrol and a box of matches then go and get myself another Jag.
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