Subaru Impreza 2003 Service Manual page 1770

DIAGNOSTIC PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
9 CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from TCM and
combination meter.
3)Measure the resistance of harness between
TCM and diagnosis connector.
Connector & terminal
(B56) No. 2 — (i10) No. 4:
10 CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
Measure the resistance of harness connector
between TCM and chassis ground to make
sure that circuit does not short.
Connector & terminal
(B56) No. 2 — Chassis ground:
11 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1)Turn the ignition switch to OFF.
2)Connect the connector to TCM and combina-
tion meter.
3)Turn the ignition switch to ON.
4)Measure the signal voltage for TCM while
installing the fuse to FWD switch connector.
Connector & terminal
(B56) No. 2 (+) — Chassis ground ( − − − − ):
12 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
Measure the signal voltage for TCM while
removing the fuse from FWD switch connector.
Connector & terminal
(B56) No. 2 (+) — Chassis ground ( − − − − ):
13 CHECK POOR CONTACT.
Check
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the voltage less than 1 V?
Is the voltage 6 — 9.1 V?
Is there poor contact in FWD
switch circuit?
4AT-100
Yes
Go to step 10. Repair the open
circuit in harness
between TCM and
combination meter
and poor contact
in coupling con-
nector.
Go to step 11. Repair the short
circuit in harness
between TCM and
combination meter
connector.
Go to step 12. Go to step 13.
Go to step 13. Replace the TCM.
<Ref. to 4AT-70,
Transmission Con-
trol Module
(TCM).>
Repair the poor Replace the TCM.
contact. <Ref. to 4AT-70,
Transmission Con-
trol Module
(TCM).>
No