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Home >> Subaru >> 2006 >> Baja Turbo, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Automatic Transmission Diagnostics (4AT) (H4SO)) >> Diagnostic Procedure for AT OIL TEMP Warning Light >> Check Power Supply And Ground Line

Check Power Supply And Ground Line

WARNING: This page is about a different variant/trim than selected.

WIRING DIAGRAM: 

Fig 1: Power Supply And Ground Line - Wiring Diagram
G04990726Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE CHART

Step Check Yes No
1 CHECK BATTERY TERMINAL. 
Turn the ignition switch to OFF.		 Is there poor contact at battery terminal? Repair or tighten the battery terminal. Go to step 2. 
2 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 

    (B55) No. 6 (+) - Chassis ground (-): 

 Is the voltage 10 - 13 V? Go to step 4.  Go to step 3. 
3 CHECK FUSE (NO. 4). 
Remove the fuse (No. 4).		 Is the fuse (No. 4) blown out? Replace the fuse (No. 4). If replaced fuse (No. 4) has blown out easily, repair short circuit in harness between fuse (No. 4) and TCM. Repair the open circuit in harness between fuse (No. 4) and TCM, or fuse (No. 4) and battery, and poor contact in coupling connector.
4 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 

    (B54) No. 23 (+) - Chassis ground (-): 

    (B54) No. 24 (+) - Chassis ground (-): 

 Is the voltage 10 - 13 V? Go to step 6.  Go to step 5. 
5 CHECK FUSE (NO. 11). 
Remove the fuse (No. 11).		 Is the fuse (No. 11) blown out? Replace the fuse (No. 11). If replaced fuse (No. 11) has blown out easily, repair short circuit in harness between fuse (No. 11) and TCM. Repair the open circuit in harness between fuse (No. 4) and TCM, or fuse (No. 4) and battery, and poor contact in coupling connector.
6 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from TCM and transmission.
  3. Measure the resistance of harness between TCM and transmission connector.

    Connector & terminal 

    (B55) No. 9 - (B11) No. 16: 

    (B55) No. 19 - (B11) No. 16: 

 Is the resistance less than 1 Ω? Go to step 7.  Repair the open circuit in harness between TCM, transmission harness connector, and poor contact in coupling connector.
7 CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND TRANSMISSION GROUND. 
Measure the resistance of harness between transmission and transmission ground.
Connector & terminal 
(T4) No. 16 - Transmission ground: 		 Is the resistance less than 1 Ω? Go to step 8.  Repair the open circuit in harness between transmission and transmission ground.
8 CHECK POOR CONTACT IN CONNECTORS.  Is there poor contact in control module power supply, ground line and data link connector? Repair the connector. Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
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