Diagnostic Procedure With Diagnostic Trouble Code (Dtc) - Subaru Legacy 2002 Service Manual

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

No.
1 CHECK HARNESS CONNECTOR
BETWEEN TCM AND ECM.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM and
ECM.
3) Measure resistance of harness between
TCM and ECM connector.
Connector & terminal
Except 3.0 L model:
(B55) No. 17 — (B135) No. 30:
3.0 L model:
(B55) No. 17 — (B136) No. 9:
2 CHECK HARNESS CONNECTOR
BETWEEN TCM AND ECM.
Measure resistance of harness between TCM
connector and chassis ground.
Connector & terminal
(B55) No. 17 — Chassis ground:
3 PREPARE SUBARU SELECT MONITOR.
4 CHECK INPUT SIGNAL FOR TCM.
1) Connect connectors to TCM and ECM.
2) Turn ignition switch to ON (engine OFF).
3) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B55) No. 17 (+) — Chassis ground (−):
5 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 engine speed using Subaru
Select Monitor.
¼ Display shows engine speed signal value
sent from ECM.
6 CHECK POOR CONTACT.
7 CONFIRM DTC 11.
Step
Is the resistance less than
1 Ω?
Is the resistance more than
1 MΩ?
Do you have a Subaru
Select Monitor?
Is the voltage more than
10.5 V?
Is the revolution value the
same as the tachometer
reading shown on the com-
bination meter?
Is there poor contact in
engine speed signal cir-
cuit?
Replace ECM with a new
one. Does the diagnostic
trouble code (DTC) appear
again, after the memory
has been cleared?
AT-41
Automatic Transmission (Diagnostics)
Check Yes
Go to step 2.
Go to step 3.
Go to step 5.
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.
Replace TCM.
<Ref. to AT-49,
Transmission
Control Module
(TCM).>
No
Repair open cir-
cuit in harness
between TCM and
ECM connector.
Repair short cir-
cuit in harness
between TCM and
ECM connector.
Go to step 4.
Go to step 6.
Go to step 6.
Go to step 7.
Replace ECM.