EA3-x NTC 0x0AE(0) Motor Current Independent Signals Too Low
NTC Overview
NTC 0x0AE.0 Motor Current Independent Signals Too Low
Description:
SF049A Loss of Assist Manager 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 MotCurrIdptSig_Cnt_u08 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: F3 Notification Only
The diagnostic is set to an F3. The fault is intended to produce not immediate change in system behavior. Its purpose is to allow disabling of EPS at the beginning of the Nth ignition cycle.
Probable Sources (Most to Least Probable):
•For EA3 single-inverter applications, the input signal is coming from SF031A Current Reasonableness.
Initialization | |
Periodic | |
Event | X |
Date | Revision | Initials |
3/27/2015 | Initial Release | Kevin Derry |
Description of Unusual Event setting NTC | Root Cause / Explanation |
Date | FDD & Rev | Modifications to Diagnostic Function |
3/27/2015 | SF049A v1.0.0 | Initial Implementation |
Algorithm Changes / Lessons Learned / Revision Log