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Home >> Subaru >> 2007 >> B9 Tribeca Base >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Brake Vacuum Control (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC 22: Discrepancy In Relays(Off) >> Wiring Diagram

DTC 22: Discrepancy In Relays(Off): Wiring Diagram

Fig 1: Vacuum Pump And Main Relay - Wiring Diagram
G05346755Courtesy of SUBARU OF AMERICA, INC.
SYMPTOM REFERENCE

Step Check Yes No
1 CHECK BRAKE VACUUM PUMP RELAY. 
  1. Turn the ignition switch to OFF.
  2. Remove the brake vacuum pump relay from the relay box.
  3. Connect the battery to terminals No. 1 and No. 3 of the brake vacuum pump relay.
  4. Measure the resistance between the brake vacuum pump relay terminals.

    Terminals 

    No. 4 - No. 5: 

 Is the resistance less than 1 Ω? Go to step 2.  Replace the brake vacuum pump relay.
2 CHECK BRAKE VACUUM PUMP RELAY POWER SUPPLY. 
  1. Turn the ignition switch to ON.
  2. Measure the voltage between brake vacuum pump relay connector and chassis ground.

    Connector & terminal 

    (VC2) No. 1 (+) - Chassis ground (-): 

    (VC2) No. 4 (+) - Chassis ground (-): 

 Is the voltage 10 V or more? Go to step 3.  Repair the open or ground short circuit of power supply circuit.
3 CHECK HARNESS BETWEEN ECM AND BRAKE VACUUM PUMP RELAY CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector of ECM.
  3. Measure the resistance of the harness between ECM and the brake vacuum pump relay connector.

    Connector & terminal 

    (B136) No. 8 - (VC2) No. 3: 

    (B135) No. 25 - (VC2) No. 5: 

 Is the resistance less than 1 Ω? Go to step 4.  Repair the open circuit of harness between ECM and the brake vacuum pump relay connector.
4 CHECK HARNESS BETWEEN THE BRAKE VACUUM PUMP AND BRAKE VACUUM PUMP RELAY CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the brake vacuum pump connector.
  3. Measure the resistance of the harness between the brake vacuum pump and brake vacuum pump relay connector.

    Connector & terminal 

    (VC2) No. 5 - (B417) No. 2: 

 Is the resistance less than 1 Ω? Go to step 5.  Repair the open circuit of the harness between the brake vacuum pump and the brake vacuum pump relay connector.
5 CHECK MOTOR GROUND. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the brake vacuum pump connector.
  3. Measure the resistance between brake vacuum pump connector and the chassis ground.

    Connector & terminal 

    (B417) No. 1 - Chassis ground: 

 Is the resistance less than 1 Ω? Go to step 6.  Repair the ground circuit.
6 CHECK BRAKE VACUUM PUMP. 
  1. Turn the ignition switch to OFF.
  2. Remove the brake vacuum pump.
  3. Connect the battery to terminals No. 2 (+) and No. 1 (-) of the brake vacuum pump.
 Is the brake vacuum pump operating? Go to step 7.  Replace the brake vacuum pump.
7 CHECK ECM. 
  1. Connect the brake vacuum pump, brake vacuum pump relay and connector.
  2. Perform the Function Check Mode. <Ref. to FUNCTION CHECK MODE , Operation, Subaru Select Monitor .>
 Is the brake vacuum pump operating? Temporary poor contact occurs. Replace the ECM. <Ref. to INSTALLATION , Engine Control Module (ECM) .>
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