2004 SUBARU FORESTER cruise

CC(H4SO)-29
CRUISE CONTROL SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
8. Diagnostic Procedure with
Diagnostic Trouble Code
(DTC)
A: DTC 21, 24, 25 AND 2A CRUISE
CONTROL MODULE BUILT-IN RE-
LAY, CPU RAM
DIAGNOSIS:
 Poor welding of built-in relay of cruise control mod-
ule.
 Failure of built-in CPU RAM of cruise control mod-
ule.
TROUBLE SYMPTOM:
 Cruise control is canceled and memorized cruise
speed is also canceled.
 Once cruise control is canceled, cruise control
cannot be set until the ignition switch and cruise
control main switch turns OFF, and then turns ON
again.
NOTE:
Check input/output signal and vehicle speed signal
with select monitor. When signals are in good con-
dition, failure is in cruise control module. (Check
the power supply and ground conditions of cruise
control module.)

CC(H4SO)-30
CRUISE CONTROL SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
B: DTC 22 VEHICLE SPEED SENSOR
DIAGNOSIS:
Disconnection or short circuit of vehicle speed sensor system.
TROUBLE SYMPTOM:
Cruise control cannot be set. (Cancelled immediately.)
WIRING DIAGRAM:
CC-00042
BATTERY
CRUISE
CONTROL
MODULE
M/B No.5IGNITION
RELAY
B17 TCM
E
C17
B17
B21
B94E2
B56
B56 C:
GEVEHICLE SPEED
SENSOR
(MT MODEL) 1
2
3
619
B94
E
16
MT
AT : AT MODEL C:
MT : MT MODELAT
12312345678910
11 12 13 14 15 16 17 18 19 20
123
4
56
78
9
1011 12
1314 15 16
12
789 56 3410 11 12
19 20 2113 14 15 16 17 18
22
23
24
F60
E216
B100
F29
LT
LT
XLXL
LT : LHD TURBO
MODEL
XL : EXCEPT LHD
TURBO MODEL
: TURBO MODEL
: NON-TURBO
MODELXL
LT
TB
NA
B17
3412
F2
1234 5678910 11 12 13 14 15 16 17 18 19 20
NA
TB :
:
F60LT :
B21XL :

CC(H4SO)-31
CRUISE CONTROL SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK TRANSMISSION TYPE.Is the target MT model? Go to step 2.Go to step 6.
2 CHECK HARNESS BETWEEN BATTERY
AND VEHICLE SPEED SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
vehicle speed sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between vehicle
speed sensor harness connector terminal and
chassis ground.
Connector & terminal
(B17) No. 3 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 3.Check the harness
for open or short
between fuse relay
and vehicle speed
sensor.
3 CHECK HARNESS BETWEEN CRUISE CON-
TROL MODULE AND VEHICLE SPEED SEN-
SOR.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
cruise control module.
3) Measure the resistance between vehicle
speed sensor harness connector terminal and
cruise control module harness connector ter-
minal.
Connector & terminal
(B17) No. 1 — (B94) No. 19:Is the resistance less than 10
Ω?Go to step 4.Repair the har-
ness.
4 CHECK HARNESS BETWEEN VEHICLE
SPEED SENSOR AND ENGINE GROUND.
1) Turn the ignition switch to OFF.
2) Measure the resistance between vehicle
speed sensor harness connector terminal and
engine ground.
Connector & terminal
(B17) No. 2 — Engine ground:Is the resistance less than 10
Ω?Go to step 5.Repair the har-
ness.
5 CHECK VEHICLE SPEED SENSOR.
1) Connect the harness connector to vehicle
speed sensor.
2) Lift-up the vehicle and support with rigid
racks.
3) Drive the vehicle at speed greater than 20
km/h (12 MPH).
Warning:
Be careful not to be caught up by the run-
ning wheels.
4) Measure the voltage between cruise control
module harness connector terminal and chas-
sis ground.
Connector & terminal
(B94) No. 19 (+) — Chassis ground (
−):Is the voltage less than 0 V ←
→ more than 5 V?Replace the cruise
control module.
Cruise Control
Module.>Replace the vehi-
cle speed sensor.
6 CHECK HARNESS BETWEEN CRUISE CON-
TROL MODULE AND TCM.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
TCM and cruise control module.
3) Measure the resistance between cruise
control module harness connector terminal
and TCM harness connector terminal.
Connector & terminal
(B94) No. 19 — (B56) No. 17:Is the resistance less than 10
Ω?Go to step 7.Repair the har-
ness.

CC(H4SO)-32
CRUISE CONTROL SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
7 CHECK TCM.
1) Connect the harness connector to TCM.
2) Lift-up the vehicle and support with rigid
racks.
3) Drive the vehicle faster than 10 km/h (6
MPH).
Warning:
Be careful not to be caught by the running
wheels.
4) Measure the voltage between TCM har-
ness connector terminal and chassis ground.
Connector & terminal
(B56) No. 17 (+) — Chassis ground (
−):Is the voltage less than 0 V ←
→ more than 5 V?Replace the cruise
control module.
Cruise Control
Module.>Replace the TCM.
Transmission Con-
trol Module
(TCM).> Step Check Yes No

CC(H4SO)-33
CRUISE CONTROL SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
C: DTC 28 WIRING HARNESS OPENED.
Step Check Yes No
1 CHECK BATTERY.
Measure the battery specific gravity of electro-
lyte.Is the battery specific gravity
more than 1.260?Go to step 2.Charge or replace
the battery. Go to
step 2.
2 CHECK FUSES, CONNECTORS AND HAR-
NESSES.
Check the condition of fuses, and harnesses
and connectors. Also check for proper ground-
ing.Is there anything unusual
about the appearance of fuse,
harness, connector and
grounding?Repair or replace
the faulty par ts.End of inspection.

CC(H4SO)-34
CRUISE CONTROL SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
D: DTC 35 AND 36 ACTUATOR MOTOR
DIAGNOSIS:
Open or poor contact of cruise control actuator motor.
TROUBLE SYMPTOM:
Cruise control cannot be set. (Cancelled immediately.)
WIRING DIAGRAM:
CC-00036
B7B94
12345612345678910
11 12 13 14 15 16 17 18 19 20
E
B7
B94
CRUISE CONTROL
MODULE
CRUISE CONTROL
ACTUATOR
11
7
51314
415236

CC(H4SO)-35
CRUISE CONTROL SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK POWER SUPPLY.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
cruise control actuator.
3) Turn the ignition switch to ON.
4) Turn the cruise control main switch to ON.
5) Measure the voltage between cruise control
actuator harness connector terminal and chas-
sis ground.
Te r m i n a l s
(B7) No. 4 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 2.Check the harness
for open or short
between cruise
control module
and cruise control
actuator.
2 CHECK GROUND CIRCUIT OF ACTUATOR.
1) Turn the ignition switch and cruise control
main switch to OFF.
2) Measure the resistance between cruise
control actuator harness connector terminal
and chassis ground.
Te r m i n a l s
(B7) No. 6 — Chassis ground:Is the resistance less than 10
Ω?Go to step 3.Repair the har-
ness.
3 MEASURE RESISTANCE OF ACTUATOR.
Measure the resistance of cruise control actua-
tor motor.
Te r m i n a l s
No. 4 — No. 1:
No. 4 — No. 2:
No. 4 — No. 5:Is the resistance approx. 5 Ω? Go to step 4.Replace the cruise
control actuator.
Actuator.>
4 CHECK HARNESS BETWEEN ACTUATOR
AND CRUISE CONTROL MODULE.
1) Disconnect the harness connector from
cruise control module.
2) Measure the resistance between cruise
control module harness connector terminal
and cruise control actuator harness connector
terminal.
Connector & terminal
(B7) No. 1 — (B94) No. 7:Is the resistance less than 10
Ω?Go to step 5.Repair the har-
ness.
5 CHECK HARNESS BETWEEN ACTUATOR
AND CRUISE CONTROL MODULE.
Measure the resistance between cruise control
module harness connector terminal and cruise
control actuator harness connector terminal.
Connector & terminal
(B7) No. 5 — (B94) No. 5:Is the resistance less than 10
Ω?Replace the cruise
control module.
Cruise Control
Module.>Repair the har-
ness.

CC(H4SO)-36
CRUISE CONTROL SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
E: DTC 37 ACTUATOR MOTOR CLUTCH
DIAGNOSIS:
Open or poor contact of cruise control actuator motor clutch.
TROUBLE SYMPTOM:
Cruise control cannot be set. (Cancelled immediately.)
WIRING DIAGRAM:
CC-00036
B7B94
12345612345678910
11 12 13 14 15 16 17 18 19 20
E
B7
B94
CRUISE CONTROL
MODULE
CRUISE CONTROL
ACTUATOR
11
7
51314
415236