Subaru LEGACY 2006 Manual page 3472

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
1 CHECK TCM SIGNAL.
1) Connect the Subaru Select Monitor to the
data link connector.
2) Turn the ignition switch to ON.
3) Read the data of "Throttle sensor voltage"
using Subaru Select Monitor.
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ACCELERATOR PEDAL POSI-
TION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM.
3) Measure the resistance of harness between
TCM and accelerator pedal position sensor
connector.
Connector & terminal
(B54) No. 10 — (B315) No. 1:
3 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness between
TCM and ECM connector.
Connector & terminal
(B54) No. 10 — (B135) No. 22:
4 CHECK HARNESS CONNECTOR AMONG
TCM, ACCELERATOR PEDAL POSITION
SENSOR AND ECM.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B54) No. 10 — Chassis ground:
5 CHECK HARNESS CONNECTOR BETWEEN
TCM CONNECTOR AND TRANSMISSION
GROUND.
1) Disconnect the connector from transmis-
sion.
2) Measure the resistance of harness between
TCM and transmission connector.
Connector & terminal
(B54) No. 8 — (B11) No. 19:
(B54) No. 17 — (B11) No. 19:
(B55) No. 2 — (B11) No. 20:
(B55) No. 3 — (B11) No. 20:
6 CHECK CIRCUIT BETWEEN TRANSMIS-
SION CONNECTOR AND TRANSMISSION
GROUND.
Measure the resistance of harness between
transmission connector and transmission case.
Connector & terminal
(B11) No. 19 — Transmission ground:
(B11) No. 20 — Transmission ground:
Check
Is the value less than 4.75 V?
Is the resistance less than 1 Ω? Go to step 3.
Is the resistance less than 1 Ω? Go to step 4.
Is the resistance 1 MΩ or
more?
Is the resistance less than 1 Ω? Go to step 6.
Is the resistance less than 1 Ω? Go to step 7.
4AT(diag)-86
Yes No
Go to step 2. Go to step 5.
Repair the open
circuit of harness
between TCM and
accelerator pedal
position sensor
connector, and
poor contact of
connector.
Repair the open
circuit of harness
between TCM and
ECM connector,
and poor contact of
connector.
Go to step 5.
Repair the short
circuit of harness
among TCM,
accelerator pedal
position sensor
and ECM connec-
tor.
Repair the open
circuit of harness
between TCM and
transmission con-
nector, and poor
contact of connec-
tor.
Repair the open
circuit of harness
between transmis-
sion connector and
transmission
ground, poor con-
tact of connector
and insufficient
tightening of
ground bolt.