LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2006 >> Legacy GT spec.B >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Automatic Transmission (Diagnostics) 4AT) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0724 Torque Converter/Brake Switch "B" Circuit High

DTC P0724 Torque Converter/Brake Switch "B" Circuit High

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

DTC DETECTING CONDITION: 

Brake switch malfunction, open input signal circuit

TROUBLE SYMPTOM: 

Gear is not shifted down when driving a down hill.

WIRING DIAGRAM: 

Fig 1: Brake Switch Malfunction - Wiring Diagram
G05019777
VOLTAGE AND RESISTANCE CHART

Step Check Yes No
1 CHECK DTC.  Does the DTC of CAN communication appear in the on-board diagnostics test mode? Perform the diagnosis according to DTC. Go to step 2. 
2 CHECK THE BODY INTEGRATED UNIT. 
  1. Turn the ignition switch to OFF.
  2. Connect the Subaru Select Monitor to the data link connector.
  3. Turn the ignition switch to ON. (engine OFF)
  4. Turn the Subaru Select Monitor switch to ON.
  5. Read the data of "Stop Light Switch" using Subaru Select Monitor. < Ref. to OPERATION , Subaru Select Monitor. >
 Is OFF displayed? Go to step 3.  Go to step 4. 
3 CHECK TCM. 
Read the data of "Stop Light Switch" using Subaru Select Monitor. < Ref. to OPERATION , Subaru Select Monitor. >		 Is OFF displayed? A temporary poor contact of connector or harness may be the cause. Check the poor contact. Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
4 CHECK BODY INTEGRATED UNIT INPUT SIGNAL. 
  1. Disconnect the harness connector of body integrated unit.
  2. Measure the voltage of harness between body integrated unit and stop light switch.

    Connector & terminal 

    (B281) No. 23 (+) - Chassis ground (-): 

 Is the voltage more than 10 V? Go to step 5.  Go to step 7. 
5 CHECK STOP LIGHT SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from stop light switch.
  3. Measure the resistance of harness between stop light switch connectors.

    Terminal 

    No. 2 - No. 3: 

 Is the resistance more than 1 MΩ? Go to step 6.  Replace the stop light switch.
6 CHECK HARNESS CONNECTOR BETWEEN BODY INTEGRATED UNIT AND STOP LIGHT SWITCH. 
  1. Turn the ignition switch to ON.
  2. Measure the voltage of harness between the body integrated unit and chassis ground.

    Connector & terminal 

    (B281) No. 23 (+) - Chassis ground (-): 

 Is the voltage less than 1 V? Go to step 7.  Repair the short circuit of harness between TCM and stop light switch.
7 CHECK POOR CONTACT.  Is there poor contact in input signal of brake switch? Repair the poor contact. Check the body integrated unit.
scientia non olet · About LEMON Manuals