Subaru 2009 IMPREZA Service Manual page 2011

Diagnostic Procedure for Subaru Select Monitor Communication
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
1 CHECK INSTALLATION OF TCM CONNEC-
TOR.
Turn the ignition switch to OFF.
2 CHECK SUBARU SELECT MONITOR POW-
ER SUPPLY CIRCUIT.
Measure the voltage between data link connec-
tor and chassis ground.
Connector & terminal
(B40) No. 16 (+) — Chassis ground (–):
3 CHECK SUBARU SELECT MONITOR
GROUND CIRCUIT.
1) Disconnect the connectors from ECM.
2) Measure the resistance of harness between
data link connector and ECM.
Connector & terminal
(B40) No. 4 — (B136) No. 6:
(B40) No. 5 — (B136) No. 6:
4 CHECK SUBARU SELECT MONITOR
GROUND CIRCUIT.
Measure the resistance of harness between
data link connector and chassis ground.
Connector & terminal
(B40) No. 16 — Chassis ground:
5 CHECK ENGINE GROUND CIRCUIT.
Check the engine ground circuit.
6 CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to ON.
2) Check communication with the transmis-
sion.
7 CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM.
3) Turn the ignition switch to ON.
4) Check communication with the engine sys-
tem.
8 CHECK OUTPUT SIGNAL OF TCM.
1) Turn the ignition switch to OFF.
2) Connect the connector to TCM.
3) Disconnect the connectors from control
modules connected to the data link connector
(B40) No. 7, excluding TCM and ECM.
CAUTION:
When disconnecting the connector from air-
bag control module, always follow the pre-
cautions on AB section. <Ref. to AB-5,
CAUTION, General Description.>
4) Turn the ignition switch to ON.
5) Check communication with the transmission
system.
Check
Is TCM connector connected to
TCM?
Is the voltage 10 V or more?
Is the resistance less than 1 ? Go to step 4.
Is the resistance 1 M or
more?
Is the engine ground circuit nor-
mal?
Is the name of system dis-
played on Subaru Select Moni-
tor?
Is the name of system dis-
played on Subaru Select Moni-
tor?
Is the name of system dis-
played on Subaru Select Moni-
tor?
4AT(diag)-26
Yes No
Go to step 2. Connect the TCM
connector to TCM.
Go to step 3. Repair harness
connector between
the battery and
data link connec-
tor, and poor con-
tact of the
connector.
Repair the open
circuit of harness
between data link
connector and
ECM.
Go to step 5. Repair the short
circuit of harness
between data link
connector and
ground terminals.
Go to step 6. Repair ground cir-
cuit of ECM.
Go to step 11. Go to step 7.
Go to step 9. Go to step 8.
Check each control Go to step 9.
module.