Subaru 2002 IMPREZA Service Manual page 1621

DIAGNOSTIC PROCEDURE FOR POWER INDICATOR LIGHT
Step
1 CHECK IGNITION SWITCH.
2 CHECK GENERATOR.
1)Start the engine.
2)Idle the engine.
3)Measure the voltage between generator and
chassis ground.
Terminal
Generator B terminal (+) — Chassis
ground ( − − − − ):
3 CHECK BATTERY TERMINAL.
Turn the ignition switch to OFF.
4 CHECK POWER SUPPLY OF TCM.
1)Disconnect the connector from TCM.
2)Turn the ignition switch to ON.
3)Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
(B56) No. 1 (+) — Chassis ground ( − − − − ):
5 CHECK FUSE (NO. 4).
Remove the fuse (No. 4).
6 CHECK IGNITION POWER SUPPLY CIR-
CUIT.
1)Turn the ignition switch to ON (engine OFF).
2)Measure the ignition power supply voltage
between TCM connector and chassis ground.
Connector & terminal
(B54) No. 23 (+) — Chassis ground (–):
(B54) No. 24 (+) — Chassis ground (–):
7 CHECK FUSE (NO. 11).
Remove the fuse (No. 11).
8 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from TCM and
transmission.
3)Measure the resistance of harness between
TCM and transmission connector.
Connector & terminal
(B56) No. 19 — (B11) No. 16:
(B54) No. 21 — (B11) No. 16:
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the ignition switch turned to
ON?
Is the voltage between 10 and
15 V?
Is there poor contact at battery
terminal?
Is the voltage between 10 and
13 V?
Is the fuse (No. 4) blown out?
Is the voltage between 10 and
13 V?
Is the fuse (No. 11) blown out? Replace the fuse
Is the resistance less than 1
Ω?
AT-35
Yes
Go to step 2. Turn the ignition
switch to ON.
Go to step 3. Repair the genera-
tor. <Ref. to SC-
14, Generator.>
Repair or tighten Go to step 4.
the battery termi-
nal.
Go to step 6. Go to step 5.
Replace the fuse Repair the open
(No. 4). If replaced circuit in harness
fuse (No. 4) has between fuse (No.
blown out easily, 4) and TCM, or
repair short circuit fuse (No. 4) and
in harness battery, and poor
between fuse (No. contact in cou-
4) and TCM. pling connector.
Go to step 8. Go to step 7.
Repair the open
(No. 11). If circuit in harness
replaced fuse (No. between fuse (No.
11) has blown out 4) and TCM, or
easily, repair short fuse (No. 4) and
circuit in harness battery, and poor
between fuse (No. contact in cou-
11) and TCM. pling connector.
Go to step 9. Repair the open
circuit in harness
between TCM,
transmission har-
ness connector,
and poor contact
in coupling con-
nector.
No