Subaru Legacy 2002 Service Manual page 1834

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
4 PREPARE SUBARU SELECT MONITOR.
5 CHECK INPUT SIGNAL FOR TCM.
1) Connect connectors to TCM and ECM.
2) Start the engine, and warm-up the trans-
mission until ATF temperature is above 80°C
(176°F).
NOTE:
If ambient temperature is below 0°C (32°F),
drive the vehicle until the ATF reaches its
operating temperature.
3) Engine idling.
4) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 1 (+) — Chassis ground (−):
6 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect connectors to TCM and ECM.
2) Connect Subaru Select Monitor to data link
connector.
3) Start the engine, and turn Subaru Select
monitor switch to ON.
4) Warm-up the engine until engine coolant
temperature is above 80°C (176°F).
5) Engine idling.
6) Read data of intake manifold pressure sig-
nal using Subaru Select Monitor.
¼ Display shows intake manifold pressure
signal value sent from ECM.
7 CHECK POOR CONTACT.
Step
Do you have a Subaru
Select Monitor?
Is the voltage between 1.2
and 1.8 V?
Is the value between 1.2
and 1.8 V?
Is there poor contact in
intake manifold pressure
signal circuit?
AT-65
Automatic Transmission (Diagnostics)
Check Yes
Go to step 6.
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 the TCM
and ECM.
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 the TCM
and ECM.
Repair poor con-
tact.
No
Go to step 5.
Go to step 7.
Go to step 7.
Replace TCM.
<Ref. to AT-49,
Transmission
Control Module
(TCM).>