Subaru 2004 LEGACY, Service Manual

Page: 324 / 609

VDC(diag)-2
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Basic Diagnostic Procedure
1. Basic Diagnostic Procedure
A: PROCEDURE
CAUTION:
When the Subaru Select Monitor is communicating (except when displaying the data), the ABS warn-
ing light flashes and VDC warning light illuminates in the combination meter. Do not communicate
with the Subaru Select Monitor while driving, because the ABS and VDC functions are disabled. Care-
fully drive the vehicle, when you have to communicate with the Subaru Select Monitor. When the data
is displayed by the {Current Data Display & Save} menu, both the ABS and VDC warning lights are
turned off and ABS and VDC functions are enabled.
NOTE:
• To check the harness for broken wires or short circuits, shake problem spot or connector.
• Refer to “Check List for Interview”. <Ref. to VDC(diag)-4, Check List for Interview.>
Step Check Yes No
1 CHECK PRE-INSPECTION.
1) Ask the customer when and how the trou-
ble occurred using the interview checklist.
<Ref. to VDC(diag)-4, Check List for Inter-
view.>
2) Before performing diagnostics, check the
component which might affect VDC problems.
<Ref. to VDC(diag)-8, INSPECTION, General
Description.> Is the component that might
influence the VDC problem
normal? Go to step 2. Repair or replace
each component.
2 CHECK INDICATION OF DTC.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data
link connector.
3) Turn the ignition switch to ON, and the Sub-
aru Select Monitor switch to ON.
4) Read the DTC. <Ref. to VDC(diag)-22,
OPERATION, Read Diagnostic Trouble Code
(DTC).>
NOTE:
If the communication function of the Subaru Se-
lect Monitor cannot be executed normally,
check the communication circuit. <Ref. to
VDC(diag)-19, COMMUNICATION FOR INI-
TIALIZING IMPOSSIBLE, INSPECTION, Sub-
aru Select Monitor.>
5) Record all DTCs and freeze frame data.
Is DTC displayed? Go to step 4. Go to step 3.
3 PERFORM GENERAL DIAGNOSTICS.
1) Inspect using “General Diagnostic Table”.
<Ref. to VDC(diag)-132, INSPECTION, Gen-
eral Diagnostic Table.>
2) Perform the clear memory mode. <Ref. to
VDC(diag)-24, OPERATION, Clear Memory
Mode.>
3) Perform the inspection mode. <Ref. to
VDC(diag)-23, PROCEDURE, Inspection
Mode.>
4) Read the DTC. <Ref. to VDC(diag)-22,
OPERATION, Read Diagnostic Trouble Code
(DTC).>
5) Check the DTC does not displayed. Do the VDC warning light and
ABS warning light go off after
starting the engine? Finish the diagno-
sis. Check the combi-
nation meter cir-
cuit. <Ref. to
VDC(diag)-30,
ABS WARNING
LIGHT DOES
NOT GO OFF,
Warning Light Illu-
mination Pattern.>
<Ref. to
VDC(diag)-33,
VDC WARNING
LIGHT AND VDC
OFF INDICATOR
LIGHT DO NOT
GO OFF, Warning
Light Illumination
Pattern.>