Subaru 2003 LEGACY Service Manual page 59

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
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.
•Throttle position sensor input signal is indi-
cated.
Is throttle sensor data within the specified
range?
15 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
Throttle fully open.
NOTE:
Must be changed correspondingly with acceler-
ator pedal operation (from "released" to "de-
pressed" position).
Is throttle sensor data within the specified
range?
16 CHECK INPUT SIGNAL FOR TCM (THROT-
TLE POSITION SENSOR POWER SUPPLY).
Measure voltage between TCM connector and
chassis ground.
Connector & terminal
(B54) No. 2 (+) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
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.
•Throttle position sensor power supply voltage
is indicated.
Is the measured value within the specified
range?
18 CHECK POOR CONTACT.
Is there poor contact in throttle position sensor
circuit?
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Value
0.2 — 1.0 V
4.2 — 4.7 V
4.8 — 5.3 V
4.8 — 5.3 V
There is poor contact.
AT-57
Yes
Go to step 15. Go to step 18.
Go to step 18. Go to step 17.
Even if "POWER" Go to step 18.
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector or
harness may be
the cause. Repair
harness or con-
nector in throttle
position sensor cir-
cuit.
Even if "POWER" Go to step 18.
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector or
harness may be
the cause. Repair
harness or con-
nector in throttle
position sensor cir-
cuit.
Repair poor con- Replace TCM.
tact. <Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
No