Subaru IMPREZA GD 2007 Series Manual page 2726

asieps_tobira_IM_US.book 87 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Procedure without Diagnostic Trouble Code (DTC)
Step
1 CHECK SPARE FUSE.
2 CHECK FWD SWITCH.
Connect the Subaru Select Monitor to the data
link connector.
3 CHECK COMBINATION METER.
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND FWD SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM.
3) Measure the resistance of harness between
TCM and FWD switch connector.
Connector & terminal
(B54) No. 10 — (F27) No. 36:
5 CHECK HARNESS CONNECTOR BETWEEN
FWD SWITCH AND CHASSIS GROUND.
Measure the resistance of harness between
FWD switch and chassis ground.
Connector & terminal
(F27) No. 35 — Chassis ground:
6 CHECK HARNESS CONNECTOR BETWEEN
TCM AND FWD SWITCH.
Measure the resistance of harness connector
between TCM and body to make sure that cir-
cuit does not short.
Connector & terminal
(B54) No. 10 — Chassis ground:
7 CHECK INPUT SIGNAL FOR TCM.
1) Turn the ignition switch to OFF.
2) Connect the connector to TCM.
3) Turn the ignition switch to ON.
4) Measure the signal voltage for TCM while
installing the fuse to FWD switch connector.
Connector & terminal
(B54) No. 10 (+) — Chassis ground (–):
8 CHECK INPUT SIGNAL FOR TCM.
Measure the signal voltage for TCM with the
fuse removed from FWD switch connector.
Connector & terminal
(B54) No. 10 (+) — Chassis ground (–):
9 CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
combination meter.
3) Measure the resistance of harness between
TCM and line end check connector.
Connector & terminal
(B54) No. 13 — (i10) No. 4:
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the spare fuse OK?
When the fuse is inserted to
FWD switch, does the LED illu-
minate?
Does the AWD warning light
illuminate?
Is resistance less than 1 Ω?
Is resistance less than 1 Ω?
Is the resistance 1 MΩ or
more?
Is the voltage less than 1 V?
Is the voltage 6 — 9.1 V?
Is resistance less than 1 Ω?
4AT(D)(diag)-87
Yes No
Go to step 2. Replace the fuse.
Go to step 3. Go to step 4.
Go to step 9.
Go to step CHECK
CRUISE CON-
TROL SWITCH.
<Ref. to
4AT(D)(diag)-88,
CHECK CRUISE
CONTROL
SWITCH, Diag-
nostic Procedure
without Diagnostic
Trouble Code
(DTC).>
Go to step 5. Repair the open
circuit of harness
between TCM and
FWD switch con-
nectors.
Go to step 6.
Repair the open
circuit of harness
between FWD
switch connector
and chassis
ground.
Go to step 7. Repair the short
circuit of harness
between TCM and
FWD switch con-
nectors.
Go to step 8. Go to step 12.
Go to step 9. Replace the TCM.
<Ref. to 4AT-64,
Transmission Con-
trol Module
(TCM).>
Go to step 10.
Repair the open
circuit of harness
between TCM and
combination meter,
and the poor con-
tact of the connec-
tor.