Lan System (Diagnostics): Other Subaru Forester SJ

PROCEDURE

Note. To check harness for open or short circuits, shake the suspected trouble spot or connector. Check List for Interview < Ref. to CHECK LIST FOR INTERVIEW . >

CHECK

Inspect the following item about the vehicle's state.

Scheme 23

Scheme 24

SUPPLEMENTAL RESTRAINT SYSTEM "AIRBAG"

Airbag system wiring harness is routed near the body integrated unit and twisted pair line.

Scheme 25

Scheme 26

1. Bus line of LAN system is twisted pair line. Be careful not to by-pass or partly unbind the twisted pair line.
2. Do not make clearance between bus lines (CAN High, CAN Low).
3. Difference of bus line length should be within 10 cm (3.94 in).
4. Fray near the connector should be within 8 cm (3.14 in).
5. If the characteristics of the twisted pair line are changed, it may extremely weaken against noise.
6. When repairing the harness, connect the wires using soldering and protect it with insulating tape etc.

TIME STAMP

There are three types of record data for the information of time stamp, and they are stored together with diagnostic codes.

Note. Depending on DTCs, time stamp may not be stored.

1. 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: Subaru Select Monitor screen (A/C system diagnostic code and time stamp) Code Description & trouble position Trouble occurrence record Trip Count Time Count Count B14E1 Air mix door actuator stepping motor circuit wire break (driver's seat) Detected on the first time 983 18000 Common B14E7 Heater core rear sensor circuit wire break Detected on the 2nd time 984 117800 Common 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.
2. 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: Subaru Select Monitor screen (A/C system diagnostic code and time stamp) Code Description & trouble position Trouble occurrence record Trip Count Time Count Count B14E1 Air mix door actuator stepping motor circuit wire break (driver's seat) Detected on the first time 983 18000 Common B14E7 Heater core rear sensor circuit wire break Detected on the 2nd time 984 117800 Common 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.
3. Count 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. < Ref. to «PROCEDURE»(ref-662108-S20335671152014101300000) , Basic Diagnostic Procedure. > NOTE: Subaru Select Monitor screen (A/C system diagnostic code and time stamp) Code Description & trouble position Trouble occurrence record Trip Count Time Count Count B14E1 Air mix door actuator stepping motor circuit wire break (driver's seat) Detected on the first time 983 18000 Common B14E7 Heater core rear sensor circuit wire break Detected on the 2nd time 984 117800 Common Even when multiple diagnostic codes are stored in multiple control modules, it is possible to determine the code stored first through the count function. NOTE: Troubleshooting for CAN system U-code occurrence When the first stored diagnostic code is a U-code for CAN system, perform the troubleshooting as a U code combination, instead of a U code alone. In addition, when CAN open circuit occurs, communication of the diagnostic device itself becomes impossible beyond the particular areas. However, trouble positions can also be determined by the combination of initial communication success/failure. Thus, by performing the basic diagnostic procedure in LAN system, trouble positions can be determined efficiently on the principle above. < Ref. to «PROCEDURE»(ref-662150-S19622750042014101300000) , Basic Diagnostic Procedure. >

GENERAL TOOL

Scheme 27

CHECK USING THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING

1. Network diagram

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Scheme 29

1. Check sheet of communication for initializing

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Scheme 31

1. Module installation check Write "-" marks in the field for installation check if the vehicle to be inspected does not have relevant module. Write "-" marks in all blank fields on the same row that the "-" mark has filled in. NOTE: Example of writing < Ref. to «EXAMPLE OF WRITING FOR THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING»(ref-662150-S01671619842014101300000) , COMMUNICATION FOR INITIALIZING IMPOSSIBLE, Subaru Select Monitor. >
2. SSM communication initialization check Write "o" marks in the field for communication initialization if the module succeeded in the communication for initializing with Select Monitor. If the communication with all modules is not possible, go to 3 ). Write "o" marks in all blank fields on the same row that the "o" mark has filled in. When at least one field in a column of wiring location is filled with the "o" mark, then the wiring for that location is normal. Write "o" marks in all blank fields on the same column that the "o" mark has filled in under the circled number. Check the open circuit of the modules which have no "o" mark in their columns of the wiring location in ascending order (closest to the data link connector first). (only for installed modules) If the communication is not possible after checking all harnesses, check the module power supply line. Perform the basic diagnostic procedure of the system if the power supply line is normal. Replace the module if the communication is not possible even after performing the basic diagnostic procedure. NOTE: Example of writing < Ref. to «EXAMPLE OF WRITING FOR THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING»(ref-662150-S01671619842014101300000) , COMMUNICATION FOR INITIALIZING IMPOSSIBLE, Subaru Select Monitor. > Inspection using the communication for initializing of Subaru Select Monitor cannot be used to diagnose the wiring location marked with "-". Example of DTC data not received < Ref. to «EXAMPLE OF DTC DATA NOT RECEIVED»(ref-662150-S18399297802014101300000) , LIST, List of Diagnostic Trouble Code (DTC). > and DTC matrix < Ref. to «DTC MATRIX»(ref-662150-S28561530012014101300000) , LIST, List of Diagnostic Trouble Code (DTC). > should be used to identify the faulty portion.
3. SSM communication initialization check (impossible to communicate with all modules) NOTE: Perform inspection regarding the trouble mode indicating that all CAN modules do not communicate. If at least one module becomes possible to communicate, return to 2 ). Check for the short circuit to ground. < Ref. to «GROUND SHORT INSPECTION»(ref-662150-S17018397372014101300000) , INSPECTION, CAN Communication Circuit Check. > If it is normal, go to the next. Check for the short circuit to battery. < Ref. to «BATTERY SHORT INSPECTION»(ref-662150-S25630065852014101300000) , INSPECTION, CAN Communication Circuit Check. > If it is normal, go to the next. Perform the inspection for the resistance of 52 ohms or less (short between wires). < Ref. to «52 ohms OR LESS»(ref-662150-S36807509822014101300000) , INSPECTION, CAN Communication Circuit Check. > If it is normal, go to the next. Check for the open circuit of data link connector (No. 12) in network diagram.

Non-turbo model

When (1) is open

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When (2) is open

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When (3) is open

Scheme 34

When (4) is open

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When (5) is open

Scheme 36

When (6) is open

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When (7) is open

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When (8) is open

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When (9) is open

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When (10) is open

Scheme 41

When (11) is open

Scheme 42

When (12) is open

Note. Perform inspection by referring to the SSM communication initialization check (impossible to communicate with all modules).

Scheme 43

When (13), (15) and (21) are open

Note. It is the same as in the case of open circuit of (13), (15) and (21). However, determination is possible through the difference in the data no-receive detection condition of each module. < Ref. to EXAMPLE OF DTC DATA NOT RECEIVED , LIST, List of Diagnostic Trouble Code (DTC). > If the remote engine starter does not operate even though no DTC has been detected, check the lines of the remote engine starter.

Scheme 44

When (14) is open

Scheme 45

When (16) is open

Scheme 46

When (17) is open

Scheme 47

When (18) is open

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When (19) is open

Scheme 49

When (20) is open

Scheme 50

Turbo model

When (1) is open

Scheme 51

When (2) is open

Scheme 52

When (3) is open

Scheme 53

When (4) is open

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When (5) is open

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When (6) is open

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When (7) is open

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When (8) is open

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When (9) is open

Scheme 59

When (10) is open

Scheme 60

When (11) is open

Scheme 61

When (12) is open

Note. Perform inspection by referring to the SSM communication initialization check (impossible to communicate with all modules).

Scheme 62

When (13), (15) and (20) are open

Note. It is the same as in the case of open circuit of (13), (15) and (20). However, determination is possible through the difference in the data no-receive detection condition of each module. < Ref. to EXAMPLE OF DTC DATA NOT RECEIVED , LIST, List of Diagnostic Trouble Code (DTC). > If the remote engine starter does not operate even though no DTC has been detected, check the lines of the remote engine starter.

Scheme 63

When (14) is open

Scheme 64

When (16) is open

Scheme 65

When (17) is open

Scheme 66

When (18) is open

Scheme 67

When (19) is open

Scheme 68

When (20) is open

Scheme 69

Note. When measuring the resistance of CAN communication circuit, measure it in sleep status. To enter sleep status With ignition switch OFF and key or switch operation stopped, keep the doors, trunk, and rear gate all closed for one minute or more. On models with keyless access function, keep the access key 2 m or more away from the vehicle. When the bus line is measured, combined resistance of the end resistance (120 ohms) in ECM and the end resistance (120 ohms) in VDC Control Module can be measured. The combined resistance is supposed to be approximately 53 - 61 ohms with the stabilizing circuit included. If the measured resistance value becomes 52 ohms or less, main wiring harness or related lines may be shorted. Or, the combined resistance may have changed because of a resistance other than the end resistance created on the circuit. If the measured value is 62 ohms or more, there may be a malfunction such as open circuit in one of the end resistances, or in the stabilizing circuit, or in the main wiring harness. Also, even when the resistance value falls within approx. 53 - 61 ohms, related lines may be open if an error of communication for initializing or a CAN system U-code has occurred. (The resistance won't be between approx. 53 - 61 ohms if the main wiring harness is open.)

LIST

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1. For "BUS OFF" or "NO-RECEIVE DATA" entry
2. For data error entry

1. Module installation check Write "-" marks in the field for installation check if the vehicle to be inspected does not have relevant module. Write "-" marks in all blank fields on the same row that the "-" mark has filled in.
2. Bus off detection/data not received NOTE: It becomes impossible for CAN diagnostic module to read DTC, if there is a current malfunction of open harness (data not received). If this occurs, perform the " «CHECK USING THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING»(ref-662150-S10588362332014101300000) " < Ref. to «CHECK USING THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING»(ref-662150-S10588362332014101300000) , COMMUNICATION FOR INITIALIZING IMPOSSIBLE, Subaru Select Monitor. >, and use this sheet to confirm that the corresponding part becomes the past malfunction. Mark "X" in the field corresponding to the DTCs that has been detected by each module in the check sheet. Identify and repair the faulty part by referring to the example of DTC data not received and the DTC matrix. < Ref. to «EXAMPLE OF DTC DATA NOT RECEIVED»(ref-662150-S18399297802014101300000) , LIST, List of Diagnostic Trouble Code (DTC). > < Ref. to «DTC MATRIX»(ref-662150-S28561530012014101300000) , LIST, List of Diagnostic Trouble Code (DTC). >
3. Data abnormal detection NOTE: If any DTC code that starts with P, B or C is detected after restarting the engine, perform the diagnosis for that code first. If any "BUS OFF" or "NO-RECEIVE DATA" condition is detected, perform the diagnosis for these problems first. If several modules detect the DTC for the same module, replace the detected module. If one module detects the DTC, replace the module of the detected side. If it does not return to the normal operation, re-install the module which has been replaced, and replace the module of the detected side. If it does not return to the normal operation, replace both modules.

When (13) (steering angle sensor vicinity) is open

Note. DTC is not detected except in VDC.

Scheme 72

When (15) (remote engine start Control Module vicinity) is open

Note. The remote engine starter does not operate while no DTC is detected.

When (21) (yaw rate & G sensor vicinity) is open

Note. DTC is not detected except in VDC.

Scheme 73

When (13) (steering angle sensor vicinity) is open

Note. DTC is not detected except in VDC.

When (15) (remote engine start Control Module vicinity) is open

Note. The remote engine starter does not operate while no DTC is detected.

When (20) (yaw rate & G sensor vicinity) is open

Note. DTC is not detected except in VDC.