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Communication For Initializing Impossible

DIAGNOSIS: 

Faulty harness connector

TROUBLE SYMPTOM: 

Subaru Select Monitor communication failure

WIRING DIAGRAM: 

Fig 1: Wiring Diagram - Select Monitor Communication
G03831906Courtesy of SUBARU OF AMERICA, INC.
SELECT MONITOR COMMUNICATION DIAGNOSTIC PROCEDURE

Step Check Yes No
1 
CHECK SUBARU SELECT MONITOR POWER SUPPLY CIRCUIT  .
Measure the voltage between data link connector and chassis ground.
Connector & terminal 
(B40) No. 1 (+)- Chassis ground (-): 		 Is the voltage more than 10 V? Go to step 2  . Repair harness connector and connector between battery and data link connector, and poor contact in coupling connector.
2 
CHECK SUBARU SELECT MONITOR GROUND CIRCUIT  .
Measure the resistance of harness between data link connector and chassis ground.
Connector & terminal 
(B40) No. 12- Chassis ground: 
(B40) No. 13- Chassis ground: 		 Is the resistance less than 1 ? Go to step 3  . Repair the open circuit in harness between data link connector and ground terminal, and poor contact in coupling connector.
3 
CHECK COMMUNICATION OF SUBARU SELECT MONITOR  .
  1. Turn the ignition switch to ON.
  2. Using the Subaru Select Monitor, check whether communication to transmission systems can be executed normally.
 Are the name and year of system displayed on Subaru Select Monitor? Go to step 8  . Go to step 4  .
4 
CHECK COMMUNICATION OF SUBARU SELECT MONITOR  .
  1. Turn the ignition switch to OFF.
  2. Disconnect the TCM connector.
  3. Turn the ignition switch to ON.
  4. Check whether communication to engine systems can be executed normally.
 Are the name and year of system displayed on Subaru Select Monitor? Go to step 6  . Go to step 5  .
5 
CHECK COMMUNICATION OF SUBARU SELECT MONITOR  .
  1. Turn the ignition switch to OFF.
  2. Connect the TCM connector.
  3. Disconnect the ECM connector.
  4. Turn the ignition switch to ON.
  5. Check whether communication to transmission systems can be executed normally.
 Are the name and year of system displayed on Subaru Select Monitor? Inspect the ECM. Go to step 6  .
6 
CHECK HARNESS CONNECTOR BETWEEN EACH CONTROL UNIT AND DATA LINK CONNECTOR  .
  1. Turn the ignition switch to OFF.
  2. Disconnect the TCM and ECM connector.
  3. Measure the resistance between TCM connector and chassis ground.

    Connector & terminal 

    (B40) No. 10- Chassis ground: 

 Is the resistance more than 1 M? Go to step 7  . Check harness and connector between each control unit and data link connector.
7 
CHECK OUTPUT SIGNAL OF TCM  .
  1. Turn the ignition switch to ON.
  2. Measure the voltage between TCM and chassis ground.

    Connector & terminal 

    (B40) No. 10 (+)- Chassis ground (-): 

 Is the voltage more than 1 V? Check harness and connector between each control unit and data link connector. Go to step 8  .
8 
CHECK HARNESS CONNECTOR BETWEEN TCM AND DATA LINK CONNECTOR  .
Measure the resistance between TCM connector and data link connector.
Connector & terminal 
(B54) No. 20- (B40) No. 10: 		 Is the resistance less than 1 ? Go to step 9  . Check the harness and connector between TCM and data link connector.
9 
CHECK INSTALLATION OF TCM CONNECTOR  .
Turn the ignition switch to OFF.		 Is TCM connector connected to TCM? Go to step 10  . Connect the TCM connector to TCM.
10 
CHECK INSTALLATION OF TRANSMISSION HARNESS CONNECTOR  .		 Is the transmission harness connector connected to bulkhead harness connector? Go to step 11  . Connect the bulkhead harness connector to transmission harness connector.
11 
CHECK POOR CONTACT IN CONNECTORS  .		 Is there poor contact in control unit power supply and data link connector? Repair the poor contact. Go to step 12  .
12 
CHECK POWER SUPPLY OF TCM  .
  1. Disconnect the connector from TCM.
  2. Turn the ignition switch to ON.
  3. Measure the voltage between TCM connector and chassis ground.

    Connector & terminal 

    (B54) No. 1 (+)- Chassis ground (-): 

 Is the voltage 10- 13 V? Go to step 15  . Go to step 13  .
13 
CHECK FUSE (No. 32)  .
  1. Turn the ignition switch to OFF.
  2. Remove the fuse (No. 32).
 Is the fuse (No. 32) blown out? Go to step 14  . Repair the open circuit in harness between fuse (No. 32) and TCM, or fuse (No. 32) and battery, and poor contact in coupling connector.
14 
CHECK HARNESS  .
Measure the resistance between TCM connector and chassis ground.
Connector & terminal 
(B54) No. 1- Chassis ground: 		 Is the resistance less than 10 ? Replace the fuse (No. 32). If the replaced fuse (No. 32) has blown out easily, repair the short circuit in harness between fuse (No. 32) and TCM. Replace the fuse (No. 32).
15 
CHECK IGNITION POWER SUPPLY CIRCUIT  .
  1. Turn the ignition switch to ON (engine OFF).
  2. Measure the ignition power supply voltage between TCM connector and chassis ground.

    Connector & terminal 

    (B55) No. 1 (+)- Chassis ground (-): 

    (B55) No. 10 (+)- Chassis ground (-): 

 Is the voltage 10- 13 V? Go to step 17.  Go to step 16  .
16 
CHECK FUSE (No. 12). 
Remove the fuse (No. 12).		 Is the fuse (No. 12) blown out? Replace the fuse (No. 12). If the replaced fuse (No. 12) has blown out easily, repair the short circuit in harness between fuse (No. 12) and TCM. Repair the open circuit in harness between fuse (No. 12) and TCM, or fuse (No. 12) and battery, and poor contact in coupling connector.
17 
CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION  .
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from TCM and transmission.
  3. Measure the resistance of harness between TCM and transmission connector.

    Connector & terminal 

    (B54) No. 19- Chassis ground: 

    (B55) No. 21- Chassis ground: 

    (B54) No. 5- Chassis ground: 

    (B54) No. 14- Chassis ground: 

 Is the resistance more than 1 M? Go to step 18  . Repair the short circuit in harness between TCM and transmission harness connector, and poor contact in coupling connector.
18 
CHECK POOR CONTACT IN CONNECTORS  .		 Is there poor contact in TCM power supply, ground and data link connector? Repair the connector. Replace the TCM. < Ref. to , TRANSMISSION CONTROL MODULE (TCM) . >
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