Subaru Legacy 2004 Service Manual page 2311

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ACCELERATOR PEDAL POSI-
TION SENSOR.
1) Disconnect the connector from TCM.
2) Measure the resistance of harness
between TCM and accelerator pedal position
sensor connector.
Connector & terminal
2.0 L model and 2.5 L KS, KA model
(B54) No. 10 — (B137) No. 18:
2.5 L EC, EK, K4 model
(B54) No. 10 — (B315) No. 1:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ACCELERATOR PEDAL POSI-
TION SENSOR.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B54) No. 10 — Chassis ground:
3 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
1) Connect all the connectors.
2) Turn the ignition switch to ON.
3) Measure the voltage of harness between
TCM and chassis ground.
Connector & terminal
(B54) No. 10 (+) — Chassis ground (
4 CHECK POOR CONTACT.
Check
Is the resistance less than 1
"?
Is the resistance more than 1
M"?
Is the voltage 4.6 — 5.4 V?
$
):
Is there poor contact in accel-
erator pedal position sensor
circuit?
4AT(diag)-108
Yes
Go to step 2. Repair the open
circuit in harness
between TCM and
accelerator pedal
position sensor
connector, and
poor contact in
coupling connec-
tor.
Go to step 3. Repair the short
circuit in harness
between TCM and
accelerator pedal
position sensor
connector.
Go to step 4. Even if the SPORT
indicator light is
blinking, the cir-
cuit has returned
to normal condi-
tion at this time. A
temporary poor
contact of connec-
tor or harness may
be the cause.
Repair the har-
ness or connector
in accelerator
pedal position sen-
sor circuit.
Repair the poor Replace the TCM.
contact. <Ref. to 4AT-65,
Transmission Con-
trol Module
(TCM).>
No