Subaru 2009 IMPREZA Service Manual page 2464

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
CAUTION:
Remove foreign matter (dust, water, oil etc.) from the VDCCM&H/U connector during removal and in-
stallation.
NOTE:
• To check the harness for open or short circuits, shake problem spot or connector.
• Refer to "Check List for Interview". <Ref. to VDC(diag)-4, Check List for Interview.>
Step
1 CHECK PRE-INSPECTION.
1) Ask the customer when and how the trouble
occurred using the interview check list. <Ref. to
VDC(diag)-4, Check List for Interview.>
2) Before performing diagnostics, check the
component which might affect VDC problems.
<Ref. to VDC(diag)-8, INSPECTION, General
Description.>
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 run the
Subaru Select Monitor.
4) Read the DTC using the Subaru Select
Monitor. <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 properly,
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.
3 PERFORM GENERAL DIAGNOSTICS.
1) Perform the inspection by referring to "Gen-
eral Diagnostic Table". <Ref. to VDC(diag)-103,
INSPECTION, General 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 is not displayed.
Basic Diagnostic Procedure
Is the component that might
influence the VDC problem nor-
mal?
Is DTC displayed on the Subaru
Select Monitor?
Do the VDC warning light and
ABS warning light go off after
starting the engine?
VDC(diag)-2
Check Yes
Go to step 2.
Go to step 4.
Finish the diagno-
sis.
No
Repair or replace
each component.
Go to step 3.
Check the combi-
nation meter cir-
cuit. <Ref. to
VDC(diag)-29,
ABS WARNING
LIGHT DOES NOT
GO OFF, Warning
Light Illumination
Pattern.> <Ref. to
VDC(diag)-30,
VDC WARNING
LIGHT AND VDC
OFF INDICATOR
LIGHT DO NOT
GO OFF, Warning
Light Illumination
Pattern.>