Subaru 2009 IMPREZA Service Manual page 2060

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK SPORT SHIFT SWITCH GROUND
CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the SPORT
shift switch.
3) Measure the resistance of harness between
SPORT shift switch connector and chassis
ground.
Connector & terminal
(B117) No. 8 — Chassis ground:
2 CHECK SPORT SHIFT SWITCH.
Measure the resistance between SPORT shift
switch terminals.
Connector & terminal
(B117) No. 7 — No. 8:
3 CHECK SPORT SHIFT SWITCH.
1) Move the select lever to sport shift mode.
2) Measure the resistance between SPORT
shift switch terminals.
Connector & terminal
(B117) No. 7 — No. 8:
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND SPORT SHIFT SWITCH.
1) Disconnect the connector from TCM.
2) Measure the resistance of harness between
TCM connector and SPORT shift switch con-
nector.
Connector & terminal
(B117) No. 7 — (B54) No. 17:
5 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
(B117) No. 7 — Chassis ground:
6 CHECK INPUT SIGNAL FOR TCM.
1) Connect the connector to TCM and SPORT
shift switch.
2) Turn the ignition switch to ON.
3) Return the select lever to the normal mode.
4) Measure the voltage of signal to TCM.
Connector & terminal
(B54) No. 17 (+) — Chassis ground (–):
7 CHECK POOR CONTACT.
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the resistance less than 1 ? Go to step 2.
Is the resistance 1 M or
more?
Is the resistance less than 1 ? Go to step 4.
Is the resistance less than 1 ? Go to step 5.
Is the resistance 1 M or
more?
Is the voltage 10 V or more?
Is there poor contact of the
SPORT shift switch circuit?
4AT(diag)-75
Yes No
Repair the open
circuit of harness
between the
SPORT shift
switch and chassis
ground.
Go to step 3. Replace the select
lever assembly.
<Ref. to CS-20,
Select Lever.>
Replace the select
lever assembly.
<Ref. to CS-20,
Select Lever.>
Repair the open
circuit of harness
between SPORT
shift switch con-
nector and TCM
connector.
Go to step 6. Repair the short
circuit of harness
between SPORT
shift switch con-
nector and TCM
connector.
Go to step 7. Replace the TCM.
<Ref. to 4AT-63,
Transmission Con-
trol Module
(TCM).>
Repair the poor Replace the TCM.
contact. <Ref. to 4AT-63,
Transmission Con-
trol Module
(TCM).>