Post by ccss on Oct 13, 2020 10:50:15 GMT 1
Jun 21, 2017 21:18:18 GMT 1 @Deleted said:
I have been given the headache of investigating a none charging Ford Fiesta that appears to stop charging when the alternator is warmed up.I have conflicting information from the aftermarket suppliers and technical information I have read on the internet about vehicle batteries!
The Fiesta is a 2012, 1.4 engine code SPJC. Most Smart Charging Systems I have come across on Ford vehicles have 3 small wires to the alternator, however this Ford has one LIN connection only. On the three wire system I have read test details that advise while the engine is KOEO, unplug the 3 pin plug and then start the engine, if the alternator works then its either a wiring fault or the ECM, however I am not 100% sure how to test the single wire LIN setup!
I have had VERUS on it and code U0120 is logged, I have also had the scope on it and the LIN signal is there. When the alternator has been run a while the battery light illuminates, a glitch on a couple of PIDS shows up, the fault code is logged, the scope shows battery voltage all the time when the battery light is on or not, and the LIN signal never changes whether the battery light is illuminated or not.
The history;
About a month ago the same problem was present on this car, I concluded that the alternator had failed, the auto electrician said the regulator had failed and put a new one in. I was advised by the aftermarket suppliers that I did not need to fit a calcium type battery, I was told that the lead acid battery is the same, I questioned that ?
I read on the internet that a calcium battery actually is a lead acid battery but the plates are coated, I went with the suppliers advice and put the lead acid battery type on a month a go.
The alternator is going to the auto electricians tomorrow for test and if necessary repair. I am going to ask about the regulator fitted and wonder if there is or could be a compatability issue with that and the battery and ECM LIN data transmission!
Does anyone know the correct test procedure to test the alternator on these cars with the single wire LIN connection please!