Basic Diagnostic Procedure: Procedure

CAUTION: Remove foreign matter (dust, water, oil etc.) from the VDCCM & H/U connector during removal and installation.

Fig 1: Diagnostic Trouble Code Procedure Chart

Courtesy of SUBARU OF AMERICA, INC.

CHECK PRE-INSPECTION .
1. Ask the customer when and how the trouble occurred using the interview check list. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Check List for Interview .
2. Before performing diagnostics, check the component which might affect VDC or parking brake system problems. Ref. to BRAKE CONTROL (DIAGNOSTICS)>General Description>INSPECTION .
Is the check result OK?
- Yes : Go to 2 .
- No : Repair or replace each component.
CHECK INDICATION OF DTC .
1. Turn the ignition switch to ON.
2. Read the DTC using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .
  NOTE: If the communication function of the Subaru Select Monitor cannot be executed properly, check the communication circuit. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure for Subaru Select Monitor Communication>INSPECTION>COMMUNICATION FOR INITIALIZING IMPOSSIBLE .
Are any DTCs displayed?
- Yes : Record the DTC, time stamp and freeze frame data. Go to 4 .
- No : Go to 3 .
PERFORM GENERAL DIAGNOSTICS .
1. Perform the inspection by referring to "General Diagnostic Table". Ref. to BRAKE CONTROL (DIAGNOSTICS)>General Diagnostic Table>INSPECTION .
2. Using the Subaru Select Monitor, perform the clear memory.
3. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode .
4. Read the DTC using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .
5. Check that the DTC is not displayed.
Do the VDC warning light & VDC indicator light, VDC OFF indicator light and ABS warning light go off after starting the engine?
- Yes : Finish the diagnosis.
- No : Check the combination meter circuit. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>ABS WARNING LIGHT DOES NOT GO OFF . Ref. to BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>VDC WARNING LIGHT AND VDC INDICATOR LIGHT DO NOT GO OFF . Ref. to BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>VDC OFF INDICATOR LIGHT DOES NOT GO OFF .
PERFORM DIAGNOSIS .
1. Refer to "Diagnostic Trouble Code (DTC)".
  NOTE: For the DTC list, refer to "Diagnostic Trouble Code (DTC)". Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST .
2. Correct the cause of trouble.
3. Using the Subaru Select Monitor, perform the clear memory.
4. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode .
5. Check that the DTC is not displayed.
Is DTC displayed?
- Yes : Repeat step 4 until DTC is not shown.
- No : Finish the diagnosis.