EA4-x NTC 0x0AE LoaCurrMeasIdptSigNrFlt

Nexteer Confidential

LOA Current Measure Independent Signals Number Fault Overview
NTC 0x0AE.0

FDD: SF049A

Description:

SF049A Loss of Assist Manager(LoaMgr) tries to avoid system shutdown when safe sensor redundancy is still in tact.  However, customers want to prevent EPS from operating when issues occur repeatedly across ignition cycles.  Nexteer’s strategy is to provide NTCs for each issue to be tracked.

Diagnostic Overview:

Input signal Current Measure Independent Signals represents the currently active number of Motor Current signals.  When the number of independent signals is equal to or less than a calibration in LoaMgr, the fault status is set instantly to Failed.  LoaMgr can react instantly because the function providing the input signal is expected to debounce before dropping to a lower value.

Typical Fault Response:  

1. • –LOA Based Systems 

1. • • •Response of the diagnostic is F3.
        

Probable Sources (Most to Least Probable):

1. • –For EA3 single-inverter applications, the input signal is coming from SF031A Current Reasonableness.