EA4 NTC 0x0E3 RoadWhlFrqInCalcOutOfRng
Road Wheel Frequency Input Calculated Out Of Range
Overview
NTC 0x0E3.(0, 1, 4, 5)
FDD: CF018A
Description:
Diagnostic to detect if the calculated left and calculated right wheel frequency are out of range, or changing by too large value.
Diagnostic Overview:
This function calculates a left and right wheel frequency based on multiple serial communication messages. The function compares pulse counters to timestamps from the vehicle bus to calculate wheel frequency. If these timestamps and counters get out of sequence by too large of a margin, then the calculated wheel frequency will be an unrealistic number and this diagnostic would set notify the user that something may be wrong with the wheel speed signals.
If the amount of change from one calculated wheel frequency to the next is too large, this diagnostic will also set. This diagnostic is in place to protect against large changes in the Wheel Imbalance Rejection command.
Typical Fault Response:
–LOA Based Systems
•F3
–Non-LOA Based Systems
•F3
Probable Sources (Most to Least Probable):
–Incorrect wheel speed signals
–Incorrect tire sizes
Initialization | X |
Periodic | X |
Event |
Bit | Cause |
0 | Left Frequency Out Of Range |
1 | Left Frequency Change Out Of Range |
4 | Right Frequency Out Of Range |
5 | Right Frequency Change Out Of Range |
Rev | Revision |
1.0 | Initial Release |
Revision Log