Subaru Impreza 2003 Service Manual page 3280

IMMOBILIZER (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
Step
1 CHECK ILLUMINATION OF IMMOBILIZER
INDICATOR LIGHT.
1)Turn the ignition switch to OFF or ACC posi-
tion.
2)Wait at least 60 seconds.
2 CHECK ILLUMINATION OF IMMOBILIZER
INDICATOR LIGHT.
Remove the key from ignition switch.
3 CHECK ENGINE START.
Turn the ignition switch to START position.
4 CHECK ILLUMINATION OF IMMOBILIZER
INDICATOR LIGHT.
Turn the ignition switch to ON.
5 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-7, Subaru Select
Monitor.>
3)Turn the ignition switch and Subaru Select
Monitor switch to ON.
4)Read any DTC on the display.
6 PERFORM THE DIAGNOSIS.
1)Inspect using "Diagnostics Chart with
DTC".<Ref. to IM-15, Diagnostics Chart with
Diagnostic Trouble Code (DTC).>
2)Repair the trouble cause.
3)Perform the clear memory mode.
4)Read any DTC again.
BASIC DIAGNOSTIC PROCEDURE
Does the immobilizer indicator
light blink?
Does the immobilizer indicator
light begin to blink within 1 sec-
ond after the key is removed?
Does the engine start?
Does the immobilizer indicator
light illuminate?
Are DTCs indicated on dis-
play?
Are DTCs indicated on dis-
play?
IM-2
Check
Go to step 2.
Go to step 3.
Go to step 4.
Check the immobi-
lizer indicator light
circuit.<Ref. to IM-
10, CHECK
IMMOBILIZER
INDICATOR CIR-
CUIT, Diagnostics
Chart for Immobi-
lizer Indicator
Light.>
Go to step 6.
Inspect using
"Diagnostic Chart
with DTC". <Ref.
to IM-15, Diagnos-
tics Chart with
Diagnostic Trou-
ble Code (DTC).>
Yes No
Check the immobi-
lizer indicator light
circuit.<Ref. to IM-
10, CHECK
IMMOBILIZER
INDICATOR CIR-
CUIT, Diagnostics
Chart for Immobi-
lizer Indicator
Light.>
Check the key
switch circuit.
<Ref. to IM-12,
CHECK KEY
SWITCH CIR-
CUIT, Diagnostics
Chart for Immobi-
lizer Indicator
Light.>
Go to step 5.
Immobilizer sys-
tem is normal.
Repair the related
parts.
Finish the diag-
nostics.