Subaru Legacy 2005 Service Manual page 1402

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK TRANSMISSION TYPE.
2 CHECK DTC.
Check the DTC of AT.
3 CHECK HARNESS BETWEEN ECM AND
TCM.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
TCM.
3) Measure the resistance of harness
between ECM and TCM.
Connector & terminal
(B137) No. 9 — (B55) No. 19:
4 CHECK HARNESS BETWEEN ECM AND
TCM.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B137) No. 9 — Chassis ground:
5 CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Place the shift lever except in neutral posi-
tion.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 9 (+) — Chassis ground (
6 CHECK INPUT SIGNAL OF ECM.
1) Place the shift lever in neutral position.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 9 (+) — Chassis ground (
7 CHECK INPUT SIGNAL OF ECM.
1) Disconnect the connector from ECM.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 9 (+) — Chassis ground (
8 CHECK HARNESS BETWEEN ECM AND
TRANSMISSION HARNESS CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
transmission harness connector (T9).
3) Measure the resistance of harness
between ECM and neutral position switch con-
nector.
Connector & terminal
(B137) No. 9 — (B25) No. 1:
Check
Is the transmission type AT?
Is DTC of AT displayed?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the voltage less than 1 V?
−
):
Is the voltage more than 10 V? Repair the poor
−
):
Is the voltage more than 10 V? Repair the battery
−
):
Is the resistance less than 1
Ω?
EN(H4DOTC)(diag)-162
Yes
Go to step 2. Go to step 5.
Perform the diag- Go to step 3.
nosis for AT. <Ref.
to 5AT(diag)-35,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>
Go to step 4. Repair the open
circuit of harness
between ECM and
TCM.
Repair the poor Repair the ground
contact in ECM short circuit of har-
and TCM connec- ness between
tor. ECM and TCM.
Go to step 6. Go to step 7.
Go to step 7.
contact in ECM
connector.
Go to step 8.
short circuit of har-
ness between
ECM and trans-
mission harness
connector.
Go to step 9. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit of
harness between
ECM and trans-
mission harness
connector
• Poor contact in
transmission har-
ness connector
• Poor contact in
ECM connector
No