Subaru Impreza 2003 Service Manual page 1757

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 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 SPORT shift solenoid connector.
Connector & terminal
(B54) No. 14 — (B11) No. 8:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B54) No. 14 — Chassis ground:
3 CHECK SPORT SHIFT SOLENOID.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 8 — No. 16:
4 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1)Connect the connectors to TCM and trans-
mission.
2)Turn the ignition switch to ON (engine OFF).
3)Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
(B54) No. 14 (+) — Chassis ground ( − − − − ):
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the resistance 10 — 16 Ω?
Is the voltage more than 9 V?
4AT-87
Yes
Go to step 2. Repair the open
circuit in harness
between TCM and
transmission con-
nector.
Go to step 3. Repair the short
circuit in harness
between TCM and
transmission con-
nector.
Go to step 4. Go to step 7.
Go to step 5. Go to step 6.
No