Subaru Legacy 2005 Service Manual page 2220

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
1 CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion.
3) Measure the resistance between transmis-
sion connector receptacle's terminals.
Connector & terminal
(T4) No. 5 — No. 10:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Disconnect the connector from TCM.
2) Measure the resistance of harness
between TCM and transmission connector.
Connector & terminal
(B54) No. 7 — (B11) No. 5:
3 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM and transmission connector.
Connector & terminal
(B54) No. 16 — (B11) No. 10:
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B54) No. 16 — Chassis ground:
5 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B54) No. 7 — Chassis ground:
6 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect the connectors to TCM and trans-
mission.
2) Connect the Subaru Select Monitor to data
link connector.
3) Turn the ignition switch to ON and the Sub-
aru Select Monitor power switch to ON.
4) Start the engine.
5) Shift the select lever to "P" or "N" range.
6) Read the data of turbine speed using Sub-
aru Select Monitor.
• Compare the tachometer with Subaru Select
Monitor indications.
7 CHECK POOR CONTACT.
Check
Is the resistance 450 — 650
Ω?
Is the resistance less than 1
Ω?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the resistance more than 1
MΩ?
Is the revolution value same as
the tachometer reading shown
on the combination meter?
Is there poor contact in torque
converter turbine speed sensor
circuit?
4AT(diag)-48
Yes
Go to step 2. Replace the
torque converter
turbine speed sen-
sor. <Ref. to 4AT-
59, Torque Con-
verter Turbine
Speed Sensor.>
Go to step 3. Repair the open
circuit of harness
between TCM and
transmission con-
nector.
Go to step 4. Repair the open
circuit of harness
between TCM and
transmission con-
nector, and poor
contact in connec-
tor.
Go to step 5. Repair the short
circuit of harness
between TCM and
transmission con-
nector.
Go to step 6. Repair the short
circuit of harness
between TCM and
transmission con-
nector, and poor
contact in connec-
tor.
Even if the SPORT Go to step 7.
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 TCM and trans-
mission.
Repair the poor Replace the TCM.
contact. <Ref. to 4AT-66,
Transmission Con-
trol Module
(TCM).>
No