Subaru Legacy 2002 Service Manual page 1819

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Automatic Transmission (Diagnostics)
No.
14 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect connectors to TCM, throttle posi-
tion sensor and ECM.
2) Connect Subaru Select Monitor to data link
connector.
3) Turn ignition switch to ON (engine OFF).
4) Turn Subaru Select Monitor switch to ON.
5) Throttle fully closed.
6) Read data of throttle position sensor using
Subaru Select Monitor.
¼ Throttle position sensor input signal is indi-
cated.
15 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
Throttle fully open.
NOTE:
Must be changed correspondingly with accel-
erator pedal operation (from "released" to
"depressed" position).
16 CHECK INPUT SIGNAL FOR TCM
(THROTTLE POSITION SENSOR POWER
SUPPLY).
Measure voltage between TCM connector and
chassis ground.
Connector & terminal
(B54) No. 2 (+) — Chassis ground (−):
17 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR (THROTTLE
POSITION SENSOR POWER SUPPLY).
Read data of throttle position sensor power
supply using Subaru Select Monitor.
¼ Throttle position sensor power supply volt-
age is indicated.
18 CHECK POOR CONTACT.
Step
Is the value voltage
between 0.3 and 0.7 V?
Is the value voltage
between 4.0 and 4.6 V?
Is the voltage between 4.8
and 5.3 V?
Is the value voltage
between 4.8 and 5.3 V?
Is there poor contact in
throttle position sensor cir-
cuit?
AT-50
Check Yes
Go to step 15.
Go to step 18.
Even if "POWER"
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tem-
porary poor con-
tact of the con-
nector or harness
may be the
cause. Repair
harness or con-
nector in throttle
position sensor
circuit.
Even if "POWER"
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tem-
porary poor con-
tact of the con-
nector or harness
may be the
cause. Repair
harness or con-
nector in throttle
position sensor
circuit.
Repair poor con-
tact.
No
Go to step 18.
Go to step 17.
Go to step 18.
Go to step 18.
Replace TCM.
<Ref. to AT-49,
Transmission
Control Module
(TCM).>