Subaru Legacy 2005 Service Manual page 4132

LAN SYSTEM (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
1. WITH SUBARU SELECT MONITOR
CAUTION:
• Subaru Select Monitor is required for reading DTC, performing diagnosis and reading current data.
• Remove foreign matters (dust, water, oil, etc.) from the body integrated module connector during
removal and installation.
• For the model with immobilizer, registration of immobilizer may be needed after the replacement of
controller, etc. For detailed procedure, refer to "IMMOBILIZER TEACHING OPERATION MANUAL".
NOTE:
• To check harness for broken wires or short circuits, shake trouble spot or connector.
• Check List for Interview <Ref. to LAN(diag)-3, Check List for Interview.>
Step
1 CHECK PRE-INSPECTION.
1) Ask the customer when and how the trou-
ble occurred using interview check list. <Ref. to
LAN(diag)-3, Check List for Interview.>
2) Check the display of communication error.
(Combination meter, odo/trip meter)
2 BASIC INSPECTION
Check the components which might affect
body control. <Ref. to LAN(diag)-5, INSPEC-
TION, General Description.>
3 CHECK DTC.
1) Read the DTC. <Ref. to LAN(diag)-14,
READ DIAGNOSTIC TROUBLE CODE (DTC),
OPERATION, Subaru Select Monitor.>
NOTE:
If the communication function of the Subaru Se-
lect Monitor cannot be executed normally,
check the communication circuit. <Ref. to
LAN(diag)-30, COMMUNICATION FOR INI-
TIALIZING IMPOSSIBLE, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>
2) Record all DTCs and freeze frame data.
4 PERFORM GENERAL DIAGNOSTICS.
Inspect using "General Diagnostics Table".
<Ref. to LAN(diag)-83, General Diagnostic
Table.>
5 PERFORM DIAGNOSIS.
1) Correct the cause of trouble.
2) Perform clear memory mode. <Ref. to
LAN(diag)-20, CLEAR MEMORY MODE,
OPERATION, Subaru Select Monitor.>
3) Read the DTC. <Ref. to LAN(diag)-14,
READ DIAGNOSTIC TROUBLE CODE (DTC),
OPERATION, Subaru Select Monitor.>
Basic Diagnostic Procedure
Is communication error dis-
played?
Is the component that might
influence the body control
problem normal?
Is DTC displayed on Subaru
Select Monitor?
Is result of inspection OK?
Is DTC displayed on Subaru
Select Monitor?
LAN(diag)-2
Check
Go to step 3.
Go to step 3.
Go to step 5.
LAN system is nor-
mal.
Repeat step 5 until
DTC is not shown.
Yes No
Go to step 2.
Repair or replace
each component.
Go to step 4.
Go to step 5.
Finish the diagno-
sis.