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Diagnostic Procedure for Select Monitor Communication


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     DIAGNOSTIC PROCEDURE FOR SELECT MONITOR COMMUNICATION
AUTOMATIC TRANSMISSION (DIAGNOSTICS)

13.Diagnostic Procedure for Select Monitor Communication
A: COMMUNICATION FOR INITIALIZING IMPOSSIBLE
DIAGNOSIS:
Faulty harness connector
TROUBLE SYMPTOM:
Select Monitor communication failure
WIRING DIAGRAM:
                                                                                                                                                   BATTERY




                                                                                                                          SBF-5
                                                     SBF-1
                 NO.4




                                                                                                                                                                         E
                                                     SBF-4




                                                                                                                                           F44
                             F45




                                                                                                                                  7
                        9




                                                                    IGNITION                                                               B61
                             B62
                                                                    SWITCH
                                                                                                                                                                 1
                                                                                                                                                                10
                                                                                                                                                                       DATA LINK
                                                     NO.11




                                                                                                                                                                 6
                                                                                                                                                                       CONNECTOR
                                                                                                                                                                12
                                                                                                                                                                13

                                                                                                                                                               B40
                                                                                                         A22
                                               A23

                                                              A24




                                                                                                   B7
                        B6




                                          A: B54                     B: B55        TCM
                                                                                                                                   2
                                                                                                                                   4




                                                                                                                     B300

                                                                                                                       LINE END
                                                                                                                        CHECK
                                                              B19
                                               B9




                                                                                                                      CONNECTOR



                                                                                                                                                         B21
                                                                                                                                                    16




                                                                     B11                                                                                 E2
                                                              16




                                                                      T4




                                                             E
                                                                                                                                                   E
                                             TRANSMISSION


          F44                               B40                                               B21                                                  B11          B300


       1 2 3 4                                                                           1    2    3    4                                  1   23 4             1 2 3
                                   1 2 3 4 5 6 7 8
       5 6 7 8                                                                           5    6    7    8                             5     6 7     8           4 5 6
                                   9 10 11 12 13 14 15 16                                9    10   11   12                              9 10   11 12
                                                                                         13   14   15   16                            13   14 15   16
                                                                                                                                       17 18   19 20

                F45                                          B55                                               B54


      1 2 3        4 5 6 7             1 2 3 4               5 6      7    8 9            1 2 3 4              5 6 7          8       9
      8 9 10 11 12 13 14 15 16         10 11 12 13           14 15    16   17 18          10 11 12 13          14 15 16       17      18
                                       19 20 21                       22   23 24          19 20 21                   22       23      24
                                                                                                                                                                             AT-00424




                                                                               4AT(H4SO)-30
    DIAGNOSTIC PROCEDURE FOR SELECT MONITOR COMMUNICATION
                                                                     AUTOMATIC TRANSMISSION (DIAGNOSTICS)

                     Step                           Check                    Yes                                 No
1     CHECK SUBARU SELECT MONITOR POW- Is the voltage more than 10 V? Go to step 2.                    Repair the har-
      ER SUPPLY CIRCUIT.                                                                               ness and connec-
      Measure the voltage between data link con-                                                       tor between
      nector and chassis ground.                                                                       battery and data
       Connector & terminal                                                                            link connector, and
        (B40) No. 1 (+) -- Chassis ground (-):                                                         poor contact in
                                                                                                       coupling connec-
                                                                                                       tor.
2     CHECK SUBARU SELECT MONITOR                   Is the resistance less than 1   Go to step 3.      Repair the open
      GROUND CIRCUIT.                               ?                                                  circuit in harness
      Measure the resistance of harness between                                                        between data link
      data link connector and chassis ground.                                                          connector and
       Connector & terminal                                                                            ground terminal,
         (B40) No. 12 -- Chassis ground:                                                               and poor contact
         (B40) No. 13 -- Chassis ground:                                                               in coupling con-
                                                                                                       nector.
3     CHECK COMMUNICATION OF SUBARU SE-             Are the name and year of sys- Go to step 8.        Go to step 4.
      LECT MONITOR.                                 tem displayed on Subaru
      1) Turn the ignition switch to ON.            Select Monitor?
      2) Using the Subaru Select Monitor, check
      whether communication to engine systems can
      be executed normally.
4     CHECK COMMUNICATION OF SUBARU SE-             Are the name and year of sys- Go to step 6.        Go to step 5.
      LECT MONITOR.                                 tem displayed on Subaru
      1) Turn the ignition switch to OFF.           Select Monitor?
      2) Disconnect the TCM connector.
      3) Check whether communication to engine
      systems can be executed normally.
5     CHECK COMMUNICATION OF SUBARU SE-             Are the name and year of sys- Inspect the ECM.     Go to step 6.
      LECT MONITOR.                                 tem displayed on Subaru
      1) Turn the ignition switch to OFF.           Select Monitor?
      2) Connect the TCM connector.
      3) Disconnect the ECM connector.
      4) Check whether communication to transmis-
      sion systems can be executed normally.
6     CHECK HARNESS CONNECTOR BETWEEN               Is the resistance more than 1   Go to step 7.      Repair the har-
      EACH CONTROL MODULE AND DATA LINK             M?                                                 ness and connec-
      CONNECTOR.                                                                                       tor between each
      1) Turn the ignition switch to OFF.                                                              control module
      2) Disconnect the TCM, ECM, ABSCM&H/U                                                            and data link con-
      and cruise control module connectors.                                                            nector.
      3) Measure the resistance between TCM con-
      nector and chassis ground.
        Connector & terminal
          (B40) No. 10 -- Chassis ground:
          (B40) No. 6 -- Chassis ground:
7     CHECK OUTPUT SIGNAL FOR TCM.                  Is the voltage more than 1 V?   Repair the har-    Go to step 8.
      1) Turn the ignition switch to ON.                                            ness and connec-
      2) Measure the voltage between TCM and                                        tor between each
      chassis ground.                                                               control module
        Connector & terminal                                                        and data link con-
          (B40) No. 10 (+) -- Chassis ground (-):                                   nector.
          (B40) No. 6 (+) -- Chassis ground (-):
8     CHECK HARNESS/CONNECTOR BETWEEN               Is the resistance less than 0.5 Go to step 9.      Repair the har-
      TCM AND DATA LINK CONNECTOR.                  ?                                                  ness and connec-
      Measure the resistance between TCM connec-                                                       tor between TCM
      tor and data link connector.                                                                     and data link con-
        Connector & terminal                                                                           nector.
          (B55) No. 7 -- (B40) No. 10:


                                             4AT(H4SO)-31
     DIAGNOSTIC PROCEDURE FOR SELECT MONITOR COMMUNICATION
AUTOMATIC TRANSMISSION (DIAGNOSTICS)

                      Step                          Check                         Yes               No
9      CHECK HARNESS/CONNECTOR BETWEEN Is the resistance more than 1       Go to step 10.   Repair the har-
       TCM AND DATA LINK CONNECTOR.           M?                                            ness and connec-
       Measure the resistance between TCM and                                               tor between TCM
       data link connector.                                                                 and data link con-
        Connector & terminal                                                                nector.
          (B54) No. 22 -- (B40) No. 6:
10     CHECK INSTALLATION OF TCM CONNEC- Is the TCM connector inserted Go to step 11.       Insert the TCM
       TOR.                              into TCM?                                          connector into
       Turn the ignition switch to OFF.                                                     TCM.
11     CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in control Repair the poor   Replace the TCM.
                                         module and data link connec- contact.              




                                           4AT(H4SO)-32



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