Subaru Impreza 2003, Service Manual

Page: 3280 / 3610

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