Basic Diagnostic Procedure - Subaru LEGACY 2004 Service Manual

IMMOBILIZER (DIAGNOSTICS)

1. Basic Diagnostic Procedure

A: PROCEDURE
Step
1 CHECK IMMOBILIZER WARNING LIGHT.
1) Turn the ignition switch to "OFF" or "ACC".
2) Wait for more than 60 seconds.
2 CHECK KEY SWITCH.
Remove the key from ignition switch.
3 CHECK IMMOBILIZER WARNING LIGHT.
Turn the ignition switch to ON.
4 CHECK ENGINE START.
Turn the ignition switch to START.
5 CHECK ENGINE START.
Turn the ignition switch to START.
6 CHECK ENGINE START.
Turn the ignition switch to START.
7 CHECK INDICATION OF DTC ON DISPLAY.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data
link connector. <Ref. to IM(diag)-8, Subaru
Select Monitor.>
3) Turn the ignition switch and Subaru Select
Monitor switch to ON.
4) Read DTC on display.
Basic Diagnostic Procedure
Does the immobilizer warning
light blink?
Does the immobilizer warning
light blink within 1 second after
removing ignition key?
Does the immobilizer warning
light off?
Does the starter operate?
Does the starter operate?
Does the engine start?
Is the DTC displayed on
screen?
IM(diag)-2
Check Yes
Go to step 2.
Go to step 3.
Go to step 5.
Check the LAN
communication cir-
cuit. <Ref. to
LAN(diag)-2, Basic
Diagnostic Proce-
dure.>
Go to step 6.
Immobilizer sys-
tem is OK.
Go to step 8.
No
Check the immobi-
lizer warning light
circuit. <Ref. to
IM(diag)-11,
CHECK IMMOBI-
LIZER INDICA-
TOR CIRCUIT,
INSPECTION,
Diagnostics Chart
for Immobilizer
Indicator Light.>
Check the key
switch circuit.
<Ref. to IM(diag)-
13, CHECK KEY
SWITCH CIR-
CUIT, INSPEC-
TION, Diagnostics
Chart for Immobi-
lizer Indicator
Light.>
Go to step 4.
Check the DTC
display (body inte-
grated unit). Go to
step 7.
Check the LAN
communication cir-
cuit. <Ref. to
LAN(diag)-2, Basic
Diagnostic Proce-
dure.>
Check the DTC
display (ECM). Go
to step 7.
Repair the related
parts.