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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 with Diagnostic Trouble Code (DTC) >> DTC 79 Transfer Duty Solenoid

DTC 79 Transfer Duty Solenoid

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

DIAGNOSIS: 

The output signal circuit of transfer duty solenoid is open or shorted.

TROUBLE SYMPTOM: 

Excessive "braking" in tight corners.

WIRING DIAGRAM: 

Fig 1: Transfer Duty Solenoid - Wiring Diagram
G04990742Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE CHART

Step Check Yes No
1 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 

    (B54) No. 15 - (B11) No. 6: 

 Is the resistance less than 1 Ω? Go to step 2.  Repair the open circuit in harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 
Measure the resistance harness connector between TCM and chassis ground.
Connector & terminal 
(B54) No. 15 - Chassis ground: 		 Is the resistance more than 1 MΩ? Go to step 3.  Repair the short circuit in harness between TCM and transmission connector.
3 CHECK TRANSFER DUTY SOLENOID. 
Measure the resistance between transmission connector and transmission terminals.
Connector & terminal 
(T4) No.6 - No. 16: 		 Is the resistance 10 - 17 Ω? Go to step 4.  Go to step 10. 
4 PREPARE SUBARU SELECT MONITOR.  Do you have a Subaru Select Monitor? Go to step 7.  Go to step 5. 
5 CHECK OUTPUT SIGNAL EMITTED FROM TCM. 
  1. Connect the connectors to TCM and transmission.
  2. Turn the ignition switch to ON (engine OFF).
  3. Throttle is fully closed.
  4. Move the select lever to "P" range.
  5. Measure the voltage between TCM connector and chassis ground.

    Connector & terminal 

    (B54) No. 15 (+) - Chassis ground (-): 

 Is the voltage less than 1 V? Go to step 6.  Go to step 9. 
6 CHECK OUTPUT SIGNAL EMITTED FROM TCM. 
  1. Move the select lever to "D" range.
  2. Measure the voltage between TCM connector and chassis ground.

    Connector & terminal 

    (B54) No. 15 (+) - Chassis ground (-): 

 Is the voltage more than 8.5 V? Even if the AT OIL TEMP warning light blinks, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be the cause. Repair the harness or connector in TCM and transmission. Go to step 9. 
7 CHECK OUTPUT SIGNAL EMITTED FROM TCM USING SUBARU SELECT MONITOR. 
  1. Connect the connectors to TCM and transmission.
  2. Connect the Subaru Select Monitor to data link connector.
  3. Turn the ignition switch to ON (engine OFF) and turn Subaru Select Monitor switch to ON.
  4. Move the select lever to "D" range with throttle fully open (vehicle speed 0 km/h or 0 MPH).
  5. Read the data of transfer duty solenoid using Subaru Select Monitor.

  • Transfer duty solenoid is indicated in "%".
 Is the value 80 - 95%? Go to step 8.  Go to step 9. 
8 CHECK OUTPUT SIGNAL EMITTED FROM TCM USING SUBARU SELECT MONITOR. 
  1. Move the select lever to "N" range with throttle fully close (vehicle speed 0 km/h or 0 MPH).
  2. Read the data of transfer duty solenoid using Subaru Select Monitor.

  • Transfer duty solenoid is indicated in "%".
 Is the value approx. 5 - 10%? Even if the AT OIL TEMP warning light blinks, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be the cause. Repair the harness or connector in transfer duty solenoid and TCM connector. Go to step 9. 
9 CHECK POOR CONTACT.  Is there poor contact in transfer duty solenoid circuit? Repair the poor contact. Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
10 CHECK TRANSFER DUTY SOLENOID (IN TRANSMISSION). 
  1. Lift-up the vehicle and place safety stand.
    NOTE: Raise all wheels off ground.
  2. Drain the automatic transmission fluid.
    CAUTION: Do not drain the automatic transmission fluid until it cools down.
  3. Remove the extension case and disconnect connector from transfer duty solenoid.
  4. Measure the resistance between transfer duty solenoid connector and transmission ground.

    Connector & terminal 

    (AT4) No. 1 - Transmission ground: 

 Is the resistance 10 - 17 Ω? Go to step 11.  Replace the transfer duty solenoid.
11 CHECK HARNESS CONNECTOR BETWEEN TRANSFER DUTY SOLENOID AND TRANSMISSION. 
Measure the resistance of harness between transfer duty solenoid and transmission connector.
Connector & terminal 
(T4) No. 6 - (AT4) No. 1: 		 Is the resistance less than 1 Ω? Go to step 12.  Repair the open circuit in harness between transfer duty solenoid and transmission connector.
12 CHECK HARNESS CONNECTOR BETWEEN TRANSFER DUTY SOLENOID AND TRANSMISSION. 
Measure the resistance of harness between transmission connector and transmission ground.
Connector & terminal 
(T4) No. 6 - Transmission ground: 		 Is the resistance more than 1 MΩ? Even if the AT OIL TEMP warning light blinks, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be the cause. Repair the harness or contact in transfer duty solenoid and transmission. Repair the short circuit in harness between transfer duty solenoid and transmission connector.
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