Subaru IMPREZA 2002 Service Manual page 129

I
DIAGNOSTIC PROCEDURE FOR AT OIL TEMP WARNING LIGHT
I
AUTOMATIC TRANSMISSION (DIAGNOSTICSI
Step
1 CHECK IGNITION SWITCH.
2 CHECK GENERATOR.
1)Start the engine.
2)ldle the engine.
3)Measure the voltage between generator and
chassis ground.
Terminal
Generator B terminal (+)
-
Chassis
ground (-):
3 CHECK BATTERY TERMINAL.
I
Turn the ignition switch to OFF.
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
Non-turbo model
Turbo model
(654) No. 6 (+)
-
Chassis ground
( - ) I
(B56) No. 1 (+)
-
Chassis ground ( - ) :
5 CHECK FUSE (NO. 4).
Remove fuse (No. 4).
5 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 (-):
(654) No. 24 (+)-
-
Chassis ground ( - ) :
7
CHECK FUSE (NO. 11).
Remove the fuse (No. 11).
3 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
Non-turbo model
(B55) NO. 9
-
(B1 1) NO. 16
(B55) NO. 19
-
(Bl 1) NO. 16
(B56) NO. 19
-
( B l l ) NO. 16
(654) NO. 21
-
(611) NO. 16
Turbo model
Check
Is the ignition switch ON?
Is the voltage between 10 and
15 V?
Is there poor contact at battery
terminal?
Is the voltage between 10 and
15 V?
Is the fuse (No.
4) blown out?
Is the voltage more than 10 V?
Is the fuse (No. 11) blown out?
Is the resistance less than
1
n?
Yes
Go to step 2.
Go to step 3.
Repair the battery
terminal.
Go to step 6.
Replace the fuse
(No. 4). If the
replaced fuse (No.
4) has blown out
easily, repair short
circuit in harness
between fuse (No.
4) and TCM.
Go to step 8.
Replace the fuse
(No. 11). If the
replaced fuse (No.
11) has blown out
easily, repair short
circuit in harness
between fuse (No.
11) and TCM.
Go to step 9.
No
Turn the ignition
switch ON.
Repair the genera
tor. <Ref. to SC-
13, Generator.>
Go to step 4.
Go to step 5.
Repair open circuii
in harness
between fuse (No.
4) and TCM, or
fuse (No. 4) and
battery, and poor
sontact in cou-
pling connector.
Go to step 7.
Repair open circuii
in harness
Detween fuse (No.
4) and TCM, or
fuse (No. 4) and
Dattery, and poor
:ontact in cou-
Dling connector.
Repair open circuii
n harness
Detween TCM,
ransmission har-
less connector,
and poor contact
n coupling con-
lector.
AT-37