Low Frequency Initiator
The LFI is located at each vehicle wheel house(F/L, F/R, R/R). An LFI unit is mounted in each wheel well of a vehicle to enable the Receiver unit to determine the vehicle position of each WE for which it has a stored ID code. Using a LIN communition line to each LFI, the Receiver can activate an LFI to send out an LF message and trigger the WE sensor near its location to respond with an RF transmission. By activating the LFI units one at a time, the Receiver can automatically locate the vehicle position of each WE. For fault detection, the LFI will report back its “operating properly” status to the Receiver via the LIN communition line.
This DTC indicates that a LIN failure is detected when the LFI does not respond to communication check request when triggered for the 3 time. LIN failure leads to a localization failure. Therefore, this failure is verified only when localization failed. In the event of ECU over or under voltage the LFI is not powered thus DTC is not stored.
Item
Detecting Condition
Possible Cause
DTC Strategy
Check pulse and voltage
Open / Short to ground in FL LFI LIN circuit
Open in FL LFI LIN ground circuit
Short to battery in LFI LIN circuit
Enable Conditions
IGN ON (not over and under voltage detected)
On start of driving after parking for more than 19 min.
Threshold value
LFI 3 times successively triggered and LFI never respond.
Diagnosis time
Within 1 minute after IGN ON