2004 SUBARU FORESTER engine

IM-9
IMMOBILIZER (DIAGNOSTIC)
Clear Memory Mode
7. Clear Memory Mode
A: OPERATION
1) On the «Main Menu» display screen, select the
{Each System Check}, and then press the [YES] key.
2) On the «System Selection Menu» display screen,
select the {Engine Control System}, and then press the
[YES] key.
3) Press the [YES] key after displayed information
of engine type.
4) On the «Engine Diagnosis» display screen, se-
lect the {Clear Memory}, and then press the [YES]
key.
5) When the `Done’ is shown on the display screen,
turn the Subaru Select Monitor and ignition switch
to OFF.
NOTE:
 After the memory has been cleared, the ISC must be
initialized.To do this, turn the ignition switch to ON po-
sition. Wait 3 seconds before starting the engine.
 For detailed operation procedure, refer to the SUB-
ARUSELECT MONITOR OPERATION MANUAL.

IM-11
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Chart for Immobilizer Warning Light
Step Check Yes No
1 CHECK IMMOBILIZER WARNING LIGHT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
IMM ECM.
3) Connect a resistor (750 Ω) between IMM
ECM harness connector terminal No. 9 and
chassis ground.Does the immobilizer warning
light illuminate?Go to step 2.Go to step 5.
2 CHECK IMM ECM GROUND CIRCUIT.
Measure the resistance between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 2, No. 3 — Chassis ground:Is the resistance less than 10
Ω?Go to step 3.Repair the open
circuit of IMMECM
ground circuit.
3 CHECK IMM ECM IGNITION CIRCUIT.
1) Turn the ignition switch to ON. (engine
OFF.)
2) Measure the voltage between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 12 (+) — Chassis ground(
−):Is the voltage more than 10 V? Go to step 4.Check the harness
for open or short
between IMM
ECM and ignition
switch.
4 CHECK IMM ECM POWER SUPPLY CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Measure the voltage between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 10, No. 11 (+) — Chassis
ground(
−):Is the voltage more than 10 V? Replace the IMM
ECM 37, Immobilizer
Control Module.>
and then replace
all ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
teaching opera-
tion manual (Pub.
No. S0820GZ).Check the harness
for open or short
between IMM
ECM and fuse.
5 CHECK COMBINATION METER CIRCUIT.
1) Remove the combination meter. IDI-10, Combination Meter Assembly.>
2) Measure the voltage between combination
meter harness connector terminal and chassis
ground.
Connector & terminal
(i10) No. 8 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 6.Check the harness
for open or short
between combina-
tion meter and
fuse.
6 CHECK COMBINATION METER CIRCUIT.
Measure the resistance between IMM ECM
harness connector terminal and combination
meter harness connector terminal.
Connector & terminal
LHD model
(B141) No. 9 — (i12) No. 4:
RHD model
(B141) No. 9 — (i11) No. 5:Is the resistance less than 10
Ω?Faulty LED.
Replace the com-
bination meter
printed circuit.
DISASSEMBLY,
Combination
Meter Assembly.>Repair the har-
ness or connector.

IM-14
IMMOBILIZER (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
9. List of Diagnostic Trouble Code (DTC)
A: LIST
NOTE:
Perform the engine DTC when the DTC except immobilizer DTC is detected. Diagnostic Trouble Code (DTC).> to EN(H4DOTC 2.5)-65, List of Diagnostic Trouble Code (DTC).>
DTC Item Contents of diagnosis Index No.
P1571Reference Code Incompati-
bilityReference code incompatibility
between IMM ECM and ECM INCOMPATIBILITY, Diagnostics Procedure with
Diagnostic Trouble Code (DTC).>
P1572EGI — Immobilizer Commu-
nication
(Except Antenna Circuit)Communication failure between
IMM ECM and ECM URE (EXCEPT ANTENNA CIRCUIT), Diagnostics
Procedure with Diagnostic Trouble Code (DTC).>
P1574Key — Immobilizer Commu-
nicationFailure of IMM ECM to verify key
(transponder) ID code TION FAILURE, Diagnostics Procedure with Diag-
nostic Trouble Code (DTC).>
P0513 Incorrect Immobilizer Key Incorrect immobilizer key (Use of
unregistered key in IMM ECM) LIZER KEY, Diagnostics Procedure with Diagnostic
Trouble Code (DTC).>
P1576EGI Control Module
EEPROMECM malfunctioning ULE EEPROM, Diagnostics Procedure with Diag-
nostic Trouble Code (DTC).>
P1577IMMControl Module
EEPROMIMM ECM malfunctioning ULE EEPROM, Diagnostics Procedure with Diag-
nostic Trouble Code (DTC).>
P1570 ANTENNA Faulty antenna Procedure with Diagnostic Trouble Code (DTC).>

IM-15
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Procedure with Diagnostic Trouble Code (DTC)
10.Diagnostics Procedure with Diagnostic Trouble Code (DTC)
A: DTC P1571 REFERENCE CODE INCOMPATIBILITY
DIAGNOSIS:
Reference code incompatibility between IMM ECM and ECM
Step Check Yes No
1 PERFORM TEACHING OPERATION ON IG-
NITION KEY.
Perform teaching operation on all keys of the
vehicle. Refer to the teaching operation man-
ual.Is teaching operation for all
keys completed?END Replace the ECM
FU(H4SO)-44,
Engine Control
Module (ECM).>
FU(H4DOTC)-50,
Engine Control
Module (ECM).>
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>, IMM
ECM 37, Immobilizer
Control Module.>
and then replace
all ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
the teaching oper-
ation manual (Pub.
No. S0820GZ).

IM-17
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK POWER SUPPLY CIRCUIT OF IMM
ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
IMM ECM.
3) Measure the voltage between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 10, No. 11 (+) — Chassis
ground(
−):Is the voltage more than 10 V? Go to step 2.Check the harness
for open or short
between IMM
ECM and fuse.
2 CHECK IGNITION SWITCH CIRCUIT.
1) Turn the ignition switch to ON. (engine
OFF.)
2) Measure the voltage between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 12 (+) — Chassis ground(
−):Is the voltage more than 10 V? Go to step 3.Check the harness
for open or short
between IMM
ECM and ignition
switch.
3 CHECK GROUND CIRCUIT OF IMM ECM.
1) Turn the ignition switch to OFF.
2) Measure the resistance between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 2, No. 3 — Chassis ground:Is the resistance less than 10
Ω?Go to step 4.Repair the open
circuit of IMMECM
ground circuit.
4 CHECK HARNESS BETWEEN IMM ECM
AND ECM.
1) Disconnect the harness connector from
ECM and IMM ECM.
2) Measure the resistance between IMM ECM
harness connector terminal and ECM harness
connector terminal.
Connector & terminal
Non-turbo LHD model
(B141) No. 1 — (B137) No. 17:
Non-turbo RHD model
(B141) No. 1 — (B137) No. 18:
Turbo model
(B141) No. 1 — (B137) No. 19:Is the resistance less than 10
Ω?Go to step 5.Repair the open
circuit of harness
between IMM
ECM and ECM.
5 CHECK HARNESS BETWEEN IMM ECM
AND ECM.
Measure the resistance between IMM ECM
harness connector terminal and ECM harness
connector terminal.
Connector & terminal
Non-turbo LHD model
(B141) No. 6 — (B137) No. 18:
Non-turbo model
(B141) No. 6 — (B137) No. 17:
Turbo model
(B141) No. 6 — (B137) No. 27:Is the resistance less than 10
Ω?Go to step 6.Repair the open
circuit of harness
between IMM
ECM and ECM.

IM-18
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Procedure with Diagnostic Trouble Code (DTC)
6 CHECK HARNESS OF COMMUNICATION
LINE.
1) Turn the ignition switch to ON. (engine
OFF.)
2) Measure the voltage between IMM ECM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 1, No. 6 (+) — Chassis ground
(
−):Is the voltage 0 V? Go to step 7.Repair the har-
ness between IMM
ECM and ECM,
because there is
short circuit with
battery voltage line
or ignition switch
“ON” line.
7 CHECK HARNESS OF COMMUNICATION
LINE.
Measure the voltage between ECM harness
connector terminal and engine ground.
Connector & terminal
Non-turbo model
(B137) No. 17, No. 18 (+) — Engine
ground(
−):
Turbo model
(B137) No. 19, No. 27 (+) — Engine
ground(
−):Is the voltage 0 V? Go to step 8.Repair the har-
ness between IMM
ECM and ECM,
because there is
short circuit with
battery voltage line
or ignition switch
“ON” line.
8 CHECK ECM BY COMMUNICATION LINE
CHECK.
1) Connect the harness connector to ECM.
2) Disconnect the harness connector from
IMM ECM.
3) Perform communication line check. IM-7, COMMUNICATION LINE CHECK,
OPERATION, Subaru Select Monitor.>Does “Communication Line not
Shorted” appear on the
screen?Replace the IMM
ECM 37, Immobilizer
Control Module.>
and then replace
all ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
the teaching oper-
ation manual (Pub.
No. S0820GZ).Replace the ECM.
FU(H4SO)-44,
Engine Control
Module (ECM).>
FU(H4DOTC)-50,
Engine Control
Module (ECM).>
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).> Then per-
form teaching
operation. Refer to
the teaching oper-
ation manual (Pub.
No. S0820GZ). Step Check Yes No

IM-19
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Procedure with Diagnostic Trouble Code (DTC)
C: DTC P1574 KEY COMMUNICATION FAILURE
DIAGNOSIS:
Failure of IMM ECM to verify key (transponder) ID code
Step Check Yes No
1 CHECK IMM ECM FUNCTION.
Insert the key to ignition switch (LOCK posi-
tion), measure changes in voltage between
Antenna connector.
Connector & terminal
(B142) No. 1 (+) — No. 2: (
−)Is the voltage −30 to 30 V?
(Approx. 0.1 second after
inserting the key)
Is the voltage 0 V?
(Approx. 1 second after insert-
ing the key)Go to step 2.Replace the IMM
ECM 37, Immobilizer
Control Module.>
and then replace
all ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
the teaching oper-
ation manual (Pub.
No. S0820GZ).
2 CHECK IGNITION KEY (TRANSPONDER).
1) Remove the key from ignition switch.
2) Start the engine using other keys that have
undergone the teaching operation, furnished
with vehicle.Does the engine start? Replace the igni-
tion key (including
the transponder).
Then perform
teaching opera-
tion. Refer to the
teaching opera-
tion manual (Pub.
No. S0820GZ).Replace the IMM
ECM 37, Immobilizer
Control Module.>
and then replace
all ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
the teaching oper-
ation manual (Pub.
No. S0820GZ).

IM-20
IMMOBILIZER (DIAGNOSTIC)
Diagnostics Procedure with Diagnostic Trouble Code (DTC)
D: DTC P0513 INCORRECT IMMOBILIZER KEY
DIAGNOSIS:
Use of unregistered key in IMM ECM
E: DTC P1576 EGI CONTROL MODULE EEPROM
DIAGNOSIS:
ECM malfunctioning
1. REPLACE ECM.
Replace the ECM.
(ECM).>
Then perform teaching operation. Refer to the teaching operation manual (Pub. No. S0820GZ).
F: DTC P1577 IMM CONTROL MODULE EEPROM
DIAGNOSIS:
IMM ECM malfunctioning
1. REPLACE IMM ECM.
Replace the IMM ECM , and then replace all ignition keys (in-
cluding the transponder). Then perform teaching operation. Refer to the teaching operation manual (Pub.
No. S0820GZ).
Step Check Yes No
1 PERFORM TEACHING OPERATION ON IG-
NITION KEY.
Perform teaching operation on all keys of the
vehicle. Refer to the teaching operation man-
ual (Pub. No. S0820GZ).Is teaching operation for all
keys completed?END Replace all ignition
keys (including the
transponder). Go
to step 2.
2 PERFORM TEACHING OPERATION ON IG-
NITION KEY.
Perform teaching operation on all keys with
vehicle. Refer to the teaching operation man-
ual (Pub. No. S0820GZ).Is teaching operation for all
keys completed?END Replace the IMM
ECM 37, Immobilizer
Control Module.>
and then replace
all ignition keys
(including the tran-
sponder). Then
perform teaching
operation. Refer to
the teaching oper-
ation manual (Pub.
No. S0820GZ).