Subaru Legacy BN/BS (2015-2019) Service Manual: Caution

• Bus line of LAN system is twisted pair line. Be careful not to by-pass or partly unbind the twisted pair line.

• Do not make clearance between bus lines (CAN High, CAN Low).

• Difference of bus line length should be within 10 cm (3.94 in).

• Fray near the connector should be within 8 cm (3.14 in).

• If the characteristics of the twisted pair line are changed, it may extremely weaken against noise.

• When repairing the harness, connect the wires using soldering and protect it with electrical tape etc.

Depending on DTCs, time stamp may not be stored.

(a) Trip Count

This indicates the number of times that the ignition has been turned to ON since the vehicle was manufactured. The ignition ON count of when the diagnostic code is stored is displayed on the diagnostic code check screen.

NOTE:

The current Trip Count can be checked at “Current Data Display & Save” in “Integ. unit mode”.

By comparing the current Trip Count and the Trip Count of when the diagnostic code was stored, it is possible to determine that it is how many ignition-ON operations ago that DTC was stored.

(b) Time Count

The elapsed time from when the ignition is turned to ON to when the diagnostic code is stored is displayed on the diagnostic code check screen. It is possible to determine the length of time that passed between when the user started driving and when the diagnostic code was stored. Therefore, if Trip Count until the vehicle-received-date is determined by interviewing the user, it is possible to estimate where the user was driving when the diagnostic code was stored, using the information such as Trip Count and Time Count. This estimate is useful information to perform diagnosis including checking of repeatability.

NOTE:

When multiple diagnostic codes are recorded for one trouble, it is extremely important to determine the diagnostic code that was stored first. (It is important to perform the diagnosis for the first recorded diagnostic code.) In this case, it is also possible to immediately determine which diagnostic code was recorded first, using the information such as Trip Count and Time Count.

(c) Category

Each unit individually counts the elapsed time since the ignition is turned to ON. However, these time counts may have some errors, and therefore, the control modules need to be adjusted to the time carried by the master-time unit (the body integrated unit). When the count is set as common, it means that each control module is already adjusted to the master time, and the display for the master integrated unit is always indicated as “Common”. When the count is indicated as “Originally”, it means that the time is not synchronized with the master time. In this case, check the communication between the corresponding control module and integrated unit. When all controls other than the body integrated unit is indicated as “Originally”, perform the basic inspection for the body integrated unit. Basic Diagnostic Procedure > PROCEDURE

NOTE:

Even when multiple diagnostic codes are stored in multiple control modules, it is possible to determine the code stored first through the categorizing feature.

NOTE: