Subaru 2002 IMPREZA Service Manual page 1629

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from TCM and
ECM.
3)Measure the resistance of harness between
TCM and ECM connector.
Connector & terminal
Non-turbo model
(B55) No. 17 — (B134) No. 30:
Turbo model
(B55) No. 17 — (B136) No. 9:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
Measure the 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 the connectors to TCM and ECM.
2)Turn the ignition switch to ON (engine OFF).
3)Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
(B55) No. 17 (+) — Chassis ground ( − − − − ):
5 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1)Connect the connectors to TCM and ECM.
2)Connect the 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)Idle the engine.
6)Read the data of engine speed using Subaru
Select Monitor.
•Display shows the engine speed signal value
sent from ECM.
6 CHECK POOR CONTACT.
7 CONFIRM DTC 11.
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
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 same as
tachometer reading shown on
combination meter?
Is there poor contact in engine
speed signal circuit?
Replace the ECM with a new
one. Does the DTC appear
again, after memory has been
cleared?
AT-43
Yes
Go to step 2. Repair the open
circuit in harness
between TCM and
ECM connector.
Go to step 3. Repair the short
circuit in harness
between TCM and
ECM connector.
Go to step 5. Go to step 4.
Even if the Go to step 6.
POWER indicator
lights up, the cir-
cuit has returned
to a normal condi-
tion at this time. A
temporary poor
contact of the con-
nector or harness
may be the cause.
Repair the har-
ness or connector
in TCM and ECM.
Even if the Go to step 6.
POWER indicator
lights up, the cir-
cuit has returned
to a normal condi-
tion at this time. A
temporary poor
contact of the con-
nector or harness
may be the cause.
Repair the har-
ness or connector
in TCM and ECM.
Repair the poor Go to step 7.
contact.
Replace the TCM. Replace the ECM.
<Ref. to AT-46,
Transmission Con-
trol Module
(TCM).>
No