Subaru Legacy 2002 Service Manual page 1878

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
No.
8 CHECK HARNESS CONNECTOR
BETWEEN TCM AND COMBINATION
METER.
1) Turn ignition switch to OFF.
2) Disconnect connector from TCM and com-
bination meter.
3) Measure resistance of harness between
TCM and diagnosis connector.
Connector & terminal
(B56) No. 2 — (i10) No. 16:
9 CHECK HARNESS CONNECTOR
BETWEEN TCM AND COMBINATION
METER.
Measure resistance of harness connector
between TCM and chassis ground to make
sure that circuit does not short.
Connector & terminal
(B56) No. 2 — Chassis ground:
10 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Turn ignition switch to OFF.
2) Connect connector to TCM and combina-
tion meter.
3) Turn ignition switch to ON.
4) Measure signal voltage for TCM while
installing and removing the fuse to FWD
switch connector.
Connector & terminal
(B56) No. 2 — Chassis ground:
11 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
Measure signal voltage for TCM while remov-
ing the fuse from FWD switch connector.
Connector & terminal
(B56) No. 2 — Chassis ground:
12 CHECK POOR CONTACT.
C: CHECK BRAKE SWITCH.
No.
1 CHECK BRAKE SWITCH.
Step
Is the resistance less than
1 Ω?
Is the resistance more than
1 MΩ?
Is the voltage less than 1 V
in FWD switch while install-
ing?
Is the voltage more than 9
V in FWD switch while
removing?
Is there poor contact in
FWD switch circuit?
S004794F17
Step
When the brake pedal is
depressed, does LED light
up?
AT-109
Automatic Transmission (Diagnostics)
Check Yes
Go to step 9.
Go to step 10.
Go to step 11.
Go to step 12.
Repair poor con-
tact.
Check Yes
Go to step
CHECK ABS
SWITCH. <Ref. to
AT-110, CHECK
ABS SWITCH.,
Diagnostic Proce-
dure for
No-trouble Code.>
No
Repair open cir-
cuit in harness
between TCM and
combination meter
and poor contact
in coupling con-
nector.
Repair short cir-
cuit in harness
between TCM and
combination meter
connector.
Go to step 12.
Replace TCM.
<Ref. to AT-49,
Transmission
Control Module
(TCM).>
Replace TCM.
<Ref. to AT-49,
Transmission
Control Module
(TCM).>
No
Check brake
switch circuit.
<Ref. WI-82, A/T
Control System.>