Subaru Impreza 2003 Service Manual page 1796

DIAGNOSTIC PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
9 CHECK HARNESS CONNECTOR BETWEEN
TCM AND SPORT SHIFT SWITCH.
1)Disconnect the connector from TCM.
2)Measure the resistance of harness between
SPORT shift switch connector and chassis
ground.
Connector & terminal
(B237) No. 5 — Chassis ground:
10 CHECK INPUT SIGNAL FOR TCM.
1)Connect the connector to TCM and SPORT
shift switch.
2)Turn the ignition switch to ON. (Engine is
stopped.)
3)Move the select lever to normal mode.
4)Measure the signal voltage for TCM.
Connector & terminal
(B55) No. 15 (+) — Chassis ground (–):
11 CHECK INPUT SIGNAL FOR TCM.
1)Move the select lever to SPORT shift mode.
2)Measure the signal voltage for TCM.
Connector & terminal
(B55) No. 15 (+) — Chassis ground (–):
12 CHECK SPORT SHIFT SWITCH GROUND
LINE.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from SPORT shift
switch.
3)Measure the resistance of harness between
SPORT shift switch connector and chassis
ground.
Connector & terminal
(B237) No. 6 — Chassis ground:
13 CHECK SPORT SHIFT SWITCH.
1)Measure the resistance between SPORT
shift switch terminals.
Terminals
No. 6 — No. 2:
14 CHECK SPORT SHIFT SWITCH.
1)Move the select lever to SPORT shift mode.
2)Measure the resistance between SPORT
shift switch terminals.
Terminals
No. 6 — No. 2:
Check
Is the resistance more than 1
MΩ?
Is the voltage more than 9 V?
Is the voltage less than 1 V?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the resistance less than 1
Ω?
4AT-126
Yes
Go to step 10. Repair the short
circuit in harness
between SPORT
shift switch con-
nector and TCM
connector.
Go to step 11. Replace the TCM.
<Ref. to 4AT-70,
Transmission Con-
trol Module
(TCM).>
Even if the Go to step 26.
POWER indicator
lights up, the cir-
cuit has returned
to a normal condi-
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 sport shift switch
circuit.
Go to step 13. Repair the open
circuit in harness
between SPORT
shift switch and
chassis ground.
Go to step 14. Replace the guide
plate assembly.
Go to step 15. Replace the guide
plate assembly.
No