Vehicle: 2010 Nissan Armada, 4WD, V8-5.6L (VK56DE), Flex Fuel, Automatic Transmission/Transaxle
Problem: The customer stated that the dash goes dead, and the throttle response is poor shortly after the vehicle has been driven awhile and the engine is up to operating temperature. The malfunction indicator light (MIL) was not on.
Case Details: The technician called ALLDATA Tech-Assist for a little help. The consultant advised connecting a good, capable scan tool and road test the vehicle to duplicate the issue while watching the various sensor parameter identification data (PIDs). He advised paying close attention to the battery voltage PID and any over or undercharging conditions as they can cause these weird symptoms.
The technician performed the suggested diagnostics and found that when the cluster went dead, the alternator charging PID was 15.9 volts.
When inspecting the battery and cables, he found the battery was very hot from the overcharging condition.
Confirmed Repair: The technician replaced the alternator and load tested the battery. The road test went well. The dash remained functional, and the throttle response was perfect. Fixed!
The ALLDATA Tech-Assist team fields cases like this every day. See how Tech-Assist can help your shop save time and money with on-call diagnostic support from ASE-certified Master Technicians. More Tech Tips
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