Subaru Impreza 2003 Service Manual page 1704

DIAGNOSTIC PROCEDURE FOR POWER INDICATOR LIGHT
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
1 CHECK POWER INDICATOR LIGHT.
Turn the ignition switch to ON (engine OFF).
2 CHECK POWER INDICATOR LIGHT.
1)Turn the ignition switch to OFF.
2)Remove the combination meter.
3)Remove the POWER indicator light bulb
from combination meter.
3 CHECK POWER INDICATOR LIGHT.
Perform "Read Diagnostic Trouble Code
(DTC)". <Ref. to 4AT-24, Read Diagnostic
Trouble Code (DTC).>
4 CHECK FUSE (No. 13).
Remove the fuse (No. 13).
5 CHECK HARNESS CONNECTOR BETWEEN
COMBINATION METER AND IGNITION
SWITCH.
1)Turn the ignition switch to ON (engine OFF).
2)Measure the voltage between combination
meter connector and chassis ground.
Connector & terminal
(i11) No. 7 (+) — Chassis ground ( − − − − ):
6 CHECK COMBINATION METER.
Measure the voltage between combination
meter connector and chassis ground.
Connector & terminal
(i10) No. 16 (+) — Chassis ground ( − − − − ):
7 CHECK OPEN CIRCUIT OF HARNESS.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from combination
meter connector.
3)Measure the resistance of harness between
combination meter.
Connector & terminal
(B56) No. 11 — (i10) No. 16:
8 CHECK INPUT SIGNAL FOR TCM.
1)Connect the connector to TCM and combina-
tion meter.
2)Turn the ignition switch to ON (engine OFF).
3)Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
(B56) No. 11 (+) — Chassis ground ( − − − − ):
Check
Does the POWER indicator
light illuminate?
Is the POWER indicator light
bulb OK?
Does the POWER indicator
light blink?
Is the fuse (No. 13) blown out? Replace the fuse
Is the voltage more than 9 V?
Is the voltage less than 9 V?
Is the resistance less than 1
Ω?
Is the voltage less than 1 V?
4AT-34
Yes
Go to step 3. Go to step 2.
Go to step 4. Replace the
POWER indicator
light bulb.
A temporary poor Go to step 9.
contact of the con-
nector or harness
may be the cause.
Repair the har-
ness or connector
in TCM, inhibitor
switch and combi-
nation meter.
Go to step 5.
(No. 13). If
replaced fuse (No.
13) is blown out
easily, repair short
circuit in harness
between fuse (No.
13) and combina-
tion meter.
Go to step 6. Repair the open
circuit in harness
between combina-
tion meter and bat-
tery.
Repair the combi- Go to step 7.
nation meter.
<Ref. to IDI-14,
Combination
Meter Assembly.>
Go to step 8. Repair the open
circuit in harness
between TCM and
combination
meter, and poor
contact in cou-
pling connector.
Even if the Replace the TCM.
POWER indicator <Ref. to 4AT-70,
lights up, the cir- Transmission Con-
cuit has returned trol Module
to a normal condi- (TCM).>
tion at this time. A
temporary poor
contact of the con-
nector or harness
may be the cause.
Repair the har-
ness or connector
in TCM.
No