Subaru Legacy 2005 Service Manual page 2467

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK DTC.
2 CHECK BODY INTEGRATED MODULE.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data
link connector.
3) Turn the ignition switch to ON. (engine
OFF)
4) Turn the Subaru Select Monitor power
switch to ON.
5) Depress the brake pedal.
6) Read the data of brake pedal switch using
Subaru Select Monitor. <Ref. to LAN(diag)-14,
OPERATION, Subaru Select Monitor.>
3 CHECK TCM.
Read the data of brake pedal switch using
Subaru Select Monitor. <Ref. to 5AT(diag)-17,
OPERATION, Subaru Select Monitor.>
4 CHECK BODY INTEGRATED MODULE IN-
PUT SIGNAL.
1) Disconnect the connector from body inte-
grated module.
2) Depress the brake pedal.
3) Measure the voltage between body inte-
grated module connector and chassis ground.
Connector & terminal
(B281) No. 23 (+) — Chassis ground (
5 CHECK HARNESS CONNECTOR BETWEEN
BODY INTEGRATED MODULE AND STOP
LIGHT SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from stop light
switch.
3) Measure the resistance of harness
between body integrated module and stop light
switch.
Connector & terminal
With cruise control
(B281) No. 23 — (B65) No. 3:
Without cruise control
(B281) No. 23 — (B64) No. 2:
6 CHECK HARNESS CONNECTOR BETWEEN
BODY INTEGRATED MODULE AND STOP
LIGHT SWITCH.
Measure the resistance of harness between
body integrated module connector and stop
light switch.
Connector & terminal
(B281) No. 23 — Chassis ground:
7 CHECK POOR CONTACT.
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is any of following DTC dis-
played? / AT CAN Communica-
tion Circuit / Output Speed
Sensor Circuit / AT Vehicle
Speed Sensor Circuit Malfunc-
tion (Rear Wheel)
Is ON displayed?
Is ON displayed?
Is the voltage more than 10 V? Go to step 7.
−
):
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is there poor contact in input
signal of brake switch?
5AT(diag)-49
Yes
Perform the diag- Go to step 2.
nosis according to
DTC.
Go to step 3. Go to step 4.
A temporary poor Replace the TCM.
contact of connec- <Ref. to 5AT-61,
tor or harness may Transmission Con-
be the cause. trol Module
Check the poor (TCM).>
contact.
Go to step 5.
Go to step 6. Repair the open
circuit of harness
between body inte-
grated module and
stop light switch.
Go to step 7. Repair the short
circuit of harness
between body inte-
grated module and
stop light switch.
Repair the poor Check the body
contact. integrated module.
No