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Home >> Subaru >> 2005 >> Outback R VDC Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 25 (Automatic Transmission (Diagnostics) 4AT (D)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P1706 At Vehicle Speed Sensor Circuit Malfunction (Rear Wheel)

DTC P1706 At Vehicle Speed Sensor Circuit Malfunction (Rear Wheel)

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

DTC DETECTING CONDITION: 

Input signal circuit of TCM is open or shorted.

TROUBLE SYMPTOM: 

No lock-up or occurring tight corner braking phenomenon

WIRING DIAGRAM: 

Fig 1: Wiring Diagram - Vehicle Speed Sensor Circuit Malfunction (Rear Wheel)
G03831568Courtesy of SUBARU OF AMERICA, INC.
DTC P1706 DIAGNOSTIC PROCEDURE

Step CHECK Yes No
1 
CHECK IGNITION POWER SUPPLY CIRCUIT. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from rear vehicle speed sensor.

    Turn the ignition switch to ON.

  3. Measure the ignition power supply voltage between rear vehicle speed sensor connector and transmission ground.

    Connector & terminal 

    (AT1) No. 3 (+) - Transmission ground (-): 

 Is the voltage more than 10 V? Go to step 2  . Check the harness between rear vehicle speed sensor and battery for open circuit, short or poor contact. Repair the harness if required.
2 
CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance of harness between TCM and rear vehicle speed sensor connector.

    Connector & terminal 

    (B54) No. 23 - (AT1) No. 1: 

 Is the resistance less than 1 Ω? Go to step 3  . Repair the open circuit or poor contact of connector in harness between TCM and rear vehicle speed sensor connector.
3 
CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 
Measure the resistance of harness between TCM and rear vehicle speed sensor connector.
Connector & terminal 
(B54) No. 24 - (AT1) No. 2: 		 Is the resistance less than 1 Ω? Go to step 4  . Repair the open circuit or poor contact of connector in harness between TCM and rear vehicle speed sensor connector.
4 
CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 
Measure the resistance of harness between TCM connector and chassis ground.
Connector & terminal 
(B54) No. 23 - Chassis ground: 		 Is the resistance more than 1 MΩ? Go to step 5  . Repair the short circuit in harness between TCM and rear vehicle speed sensor connector.
5 
CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. 
Measure the resistance of harness between TCM connector and chassis ground.
Connector & terminal 
(B54) No. 24 - Chassis ground: 		 Is the resistance more than 1 MΩ? Go to step 6  . Repair the short circuit in harness between TCM and rear vehicle speed sensor connector.
6 
PREPARE OSCILLOSCOPE. 		 Do you have an oscilloscope? Go to step 8  . Go to step 7  .
7 
CHECK INPUT SIGNAL FOR TCM. 
  1. Connect the connectors to TCM and transmission.
  2. Lift-up the vehicle and support with rigid racks.
    NOTE: Raise all wheels off floor.
  3. Start the engine and set vehicle in 20 km/h (12 MPH) condition.
    NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system. < Ref. to CLEAR MEMORY MODE . >
  4. Measure the AC voltage between TCM connector terminals.

    Connector & terminal 

    (B54) No. 24 (+) - No. 23 (-): 

 Is the voltage approx. more than 2 V? Go to step 9  . Replace the rear vehicle speed sensor.
8 
CHECK INPUT SIGNAL FOR TCM USING OSCILLOSCOPE. 
  1. Connect the connectors to TCM and transmission.
  2. Lift-up the vehicle and support with rigid racks.
    NOTE: Raise all wheels off floor.
  3. Set the oscilloscope to TCM connector terminals.

    Connector & terminal 

    Positive probe; (B54) No. 24: 

    Ground lead; (B54) No. 23: 

  4. Start the engine and set vehicle in 20 km/h (12 MPH) condition.
    NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system. < Ref. to CLEAR MEMORY MODE . >
  5. Measure the signal voltage indicated on oscilloscope.
 Is the pulse voltage approx. 5 V? Go to step 9  . Replace the rear vehicle speed sensor.
9 
CHECK POOR CONTACT. 		 Is there poor contact in rear vehicle speed sensor circuit? Repair the poor contact. Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
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