SUBARU FORESTER 1999 Service Repair Manual

3H41 : CHECK TRANSMISSION TYPE.
:Is the transmission type MT?
: Go to step3H42.
: Go to step3H46.
3H42 : CHECK HARNESS CONNECTOR
BETWEEN CRUISE CONTROL MOD-
ULE AND VEHICLE SPEED SEN-
SOR.
1) Disconnect connector from vehicle speed sen-
sor and cruise control module.
2) Measure resistance of harness connector
between vehicle speed sensor and cruise control
module.
Connector & terminal
(B17) No. 1 Ð (B94) No. 18:
S6M0327A
:Is the resistance less than 10W?
: Go to step3H43.
: Repair wiring harness.3H43 : CHECK HARNESS CONNECTOR
BETWEEN BATTERY AND VEHICLE
SPEED SENSOR.
1) Turn ignition switch to ON.
2) Measure voltage between vehicle speed sensor
connector (B17) and chassis ground.
Connector & terminal
(B17) No. 3 (+) Ð Chassis ground (þ):
B6M0945A
:Is the voltage more than 10 V?
: Go to step3H44.
: Repair harness connector between bat-
tery and vehicle speed sensor.
3H44 : CHECK HARNESS CONNECTOR
BETWEEN VEHICLE SPEED SEN-
SOR AND ENGINE GROUND.
1) Turn ignition switch to OFF.
2) Measure resistance between vehicle speed
sensor connector (B17) and engine ground.
Connector & terminal
(B17) No. 2 (+) Ð Engine ground (þ):
B6M0946A
:Is the resistance less than 10W?
: Go to step3H45.
: Repair harness connector between
vehicle speed sensor and engine
ground.
39
[T3H4]6-2DIAGNOSTICS
3. Cruise Control System

3H45 : CHECK VEHICLE SPEED SENSOR.
1) Connect connector to vehicle speed sensor.
2) Set the vehicle on free roller, or lift-up the
vehicle and support with safety stands.
WARNING:
Be careful not to be caught up by the running
wheels.
3) Set oscilloscope to vehicle speed sensor con-
nector terminals.
Positive probe; (B17) No. 1
Earth lead; (B17) No. 2
H6M0789A
4) Drive the vehicle at speed greater than 20 km/h
(12 MPH).
5) Measure signal voltage indicated on oscillo-
scope.
H6M0790A
:Is the voltage more than 5 V?
: Replace cruise control module. <Ref. to
6-2 [W12B4].>
: Replace vehicle speed sensor. <Ref. to
6-2 [W1400].>3H46 : CHECK HARNESS CONNECTOR
BETWEEN CRUISE CONTROL MOD-
ULE AND AUTOMATIC TRANSMIS-
SION CONTROL MODULE.
1) Disconnect connector from automatic transmis-
sion control module and cruise control module.
2) Measure resistance between cruise control
module connector and automatic transmission
control module connector.
CAUTION:
To measure the voltage and/or resistance, use
a tapered pin with a diameter of less than 0.64
mm (0.025 in). Do not insert the pin more than
5 mm (0.20 in).
Connector & terminal
(B94) No. 18 Ð (B56) No. 17:
S6M0341A
:Is the resistance less than 10W?
: Go to step3H47.
: Repair harness connector between
cruise control module and automatic
transmission control module.
40
6-2[T3H4]DIAGNOSTICS
3. Cruise Control System

3H47 : CHECK AUTOMATIC TRANSMIS-
SION CONTROL MODULE.
1) Connect connector to automatic transmission
control module.
2) Set the vehicle on free roller, or lift-up the
vehicle and support with safety stands.
WARNING:
Be careful not to be caught by the running
wheels.
3) Drive the vehicle faster than 10 km/h (6 MPH).
4) Measure voltage between automatic transmis-
sion control module connector (B56) and chassis
ground.
CAUTION:
To measure the voltage and/or resistance, use
a tapered pin with a diameter of less than 0.64
mm (0.025 in). Do not insert the pin more than
5 mm (0.20 in).
Connector & terminal
(B56) No. 17 (+) Ð Chassis ground (þ):
S6M0342A
:Is the voltage less than 1 V¨more
than 4 V?
: Replace cruise control module. <Ref. to
6-2 [W12B4].>
: Replace automatic transmission control
module. <Ref. to 3-2 [W2200].>
41
[T3H4]6-2DIAGNOSTICS
3. Cruise Control System

5. DIAGNOSTIC CODE 14 (SET/COAST SWITCH, RESUME/ACCEL SWITCH, CANCEL
SWITCH)
DIAGNOSIS:
IShort circuit inside the SET SW and RESUME SW.
TROUBLE SYMPTOM:
ICruise control cannot be set. (Cancelled immediately.)
WIRING DIAGRAM:
S6M0123
42
6-2[T3H5]DIAGNOSTICS
3. Cruise Control System

3H51 : CHECK POWER SUPPLY.
1) Turn ignition switch to ON.
2) Turn cruise control main switch to ON.
3) Set select monitor in ªCurrent Data Display &
Saveº mode.
4) Check signals for proper operation.
(1) When pushing the SET/COAST switch:
The SET/COAST switch shown on the display
turns from ªOFFº to ªONº.
(2) When pushing the RESUME/ACCEL
switch:
The RESUME/ACCEL switch shown on the dis-
play turns from ªOFFº to ªONº.
5) Turn ignition switch to OFF.
6) Disconnect connector from cruise control com-
mand switch.
7) Turn ignition switch to ON.
8) Measure voltage between cruise control com-
mand switch connector and chassis ground.
Terminals
No. 1 (+) Ð Chassis ground (þ):
S6M0124
:Is voltage more than 10 V?
: Go to step3H52.
: Repair or replace wiring harness
between fuse & relay box and cruise
control command switch. <Ref. to 6-2
[W12B3].>3H52 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
1) Turn ignition switch to OFF.
2) Connect connector of cruise control command
switch.
3) Turn ignition switch to ON.
4) Measure voltage between cruise control com-
mand switch connector and chassis ground.
Terminals
No. 2 (+) Ð Chassis ground (þ):
S6M0124
:Is voltage more than 10 V? (When
SET/COAST switch is ON.)
: Go to step3H53.
: Replace cruise control command
switch. <Ref. to 6-2 [W12B3].>
3H53 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
Measure voltage between cruise control command
switch connector and chassis ground.
Terminals
No. 3 (+) Ð Chassis ground (þ):
S6M0124
:Is voltage more than 10 V? (When
RESUME/ACCEL switch is ON.)
: Go to step3H54.
: Replace cruise control command
switch. <Ref. to 6-2 [W12B3].>
43
[T3H5]6-2DIAGNOSTICS
3. Cruise Control System

3H54 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
Measure voltage between cruise control command
switch connector and chassis ground.
Terminals
No. 2 (+) Ð Chassis ground (þ):
S6M0124
:Is voltage more than 10 V? (When
CANCEL switch is ON.)
: Go to step3H55.
: Replace cruise control command
switch. <Ref. to 6-2 [W12B3].>
3H55 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
Measure voltage between cruise control command
switch connector and chassis ground.
Terminals
No. 3 (+) Ð Chassis ground (þ):
S6M0124
:Is voltage more than 10 V? (When
CANCEL switch is ON.)
: Go to step3H56.
: Replace cruise control command
switch. <Ref. to 6-2 [W12B3].>3H56 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connector from cruise control com-
mand switch.
3) Measure resistance between terminals of
cruise control command switch connector (switch
side) to check the switch operation.
Terminals
No. 1 Ð No. 2:
S6M0125
:Is resistance less than 10W? (When
SET/COAST switch is ON.)
: Go to step3H57.
: Replace cruise control command
switch. <Ref. to 6-2 [W12B3].>
44
6-2[T3H5]DIAGNOSTICS
3. Cruise Control System

3H57 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
Measure resistance between terminals of cruise
control command switch connector (switch side) to
check the switch operation.
Terminals
No. 1 Ð No. 2:
S6M0125
:Is resistance more than 1 MW? (When
SET/COAST switch is OFF.)
: Go to step3H58.
: Replace cruise control command
switch. <Ref. to 6-2 [W12B3].>
3H58 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
Measure resistance between terminals of cruise
control command switch connector (switch side) to
check the switch operation.
Terminals
No. 1 Ð No. 3:
S6M0125
:Is resistance less than 10W? (When
RESUME/ACCEL switch is ON.)
: Go to step3H59.
: Replace cruise control command
switch. <Ref. to 6-2 [W12B3].>3H59 : CHECK CRUISE CONTROL COM-
MAND SWITCH.
Measure resistance between terminals of cruise
control command switch connector (switch side) to
check the switch operation.
Terminals
No. 1 Ð No. 3:
S6M0125
:Is resistance more than 1 MW? (When
RESUME/ACCEL switch is OFF.)
: Go to step3H510.
: Replace cruise control command
switch. <Ref. to 6-2 [W12B3].>
3H510 : CHECK HARNESS CONNECTOR
BETWEEN CRUISE CONTROL
COMMAND SWITCH AND CRUISE
CONTROL MODULE.
1) Disconnect connector from cruise control mod-
ule.
2) Measure resistance of harness connector
between cruise control command switch and
cruise control module.
Connector & terminal
No. 2 (command switch) Ð (B94) No. 6:
S6M0126A
:Is resistance less than 10W?
: Go to step3H511.
: Repair or replace wiring harness.
45
[T3H5]6-2DIAGNOSTICS
3. Cruise Control System

3H511 : CHECK HARNESS CONNECTOR
BETWEEN CRUISE CONTROL
COMMAND SWITCH AND CRUISE
CONTROL MODULE.
Measure resistance of harness connector between
cruise control command switch and cruise control
module.
Connector & terminal
No. 3 (command switch) Ð (B94) No. 7:
S6M0127A
:Is resistance less than 10W?
: Replace cruise control module. <Ref. to
6-2 [W12B4].>
: Repair or replace wiring harness.
46
6-2[T3H5]DIAGNOSTICS
3. Cruise Control System

MEMO:
47
[T3H5]6-2DIAGNOSTICS
3. Cruise Control System

6. DIAGNOSTIC CODE 21, 22 AND 23 (VACUUM VALVE, VENT 2 VALVE, VENT 1 VALVE)
DIAGNOSIS:
IOpen or poor contact of vacuum valve, vent 2 valve and vent 1 valve.
TROUBLE SYMPTOM:
ICruise control cannot be set. (Cancels immediately.)
WIRING DIAGRAM:
S6M0128
48
6-2[T3H6]DIAGNOSTICS
3. Cruise Control System