Subaru IMPREZA GD 2007 Series Manual page 2718

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND SHIFT LOCK SOLENOID.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM and
shift lock solenoid.
3) Measure the resistance of harness between
TCM and shift lock solenoid connector.
Connector & terminal
(B54) No. 3 — (B117) No. 4:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND SHIFT LOCK SOLENOID.
Measure the resistance of the harness between
TCM and chassis ground.
Connector & terminal
(B54) No. 3 — Chassis ground:
3 CHECK HARNESS BETWEEN SHIFT LOCK
SOLENOID AND CHASSIS GROUND TERMI-
NAL.
Measure the resistance of harness between
shift lock solenoid and chassis ground.
Connector & terminal
(B117) No. 5 — Chassis ground:
4 CHECK SHIFT LOCK SOLENOID.
Measure the resistance of shift lock solenoid
terminals.
Connector & terminal
(B117) No. 5 — No. 4:
5 CHECK OUTPUT SIGNAL OF TCM.
1) Connect all connectors.
2) Turn the ignition switch to ON.
3) Move the select lever to "D" range.
4) Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B54) No. 3 (+) — Chassis ground (–):
6 CHECK OUTPUT SIGNAL OF TCM.
1) Lift up the vehicle.
NOTE:
Raise all wheels off the floor.
2) Start the engine.
3) Shift the select lever to "D" range and slowly
increase vehicle speed to exceed 20 km/h (12
MPH).
NOTE:
The speed difference between front and rear
wheels may illuminate the ABS warning light,
but this does not indicate a malfunction. When
AT control diagnosis is finished, perform the
ABS memory clearance procedure of on-board
diagnostics system.
4) Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B54) No. 3 (+) — Chassis ground (–):
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is resistance less than 1 Ω?
Is the resistance 1 MΩ or
more?
Is resistance less than 1 Ω?
Is the resistance 7 — 18 Ω?
Is the voltage 10.5 V or more? Go to step 6.
Is the voltage less than 1 V?
4AT(D)(diag)-79
Yes No
Go to step 2. Repair the open
circuit of harness
between TCM and
shift lock solenoid
connector.
Go to step 3. Repair the ground
short circuit of har-
ness between
TCM and shift lock
solenoid connec-
tor.
Go to step 4.
Repair the open
circuit of harness
between chassis
ground and shift
lock solenoid con-
nector.
Go to step 5.
Replace the shift
lock solenoid.
Repair the poor
contact.
Even if the ATF Repair the poor
temperature warn- contact.
ing light blinks, the
circuit is in normal
condition at this
time. A temporary
poor contact of
connector or har-
ness may be the
cause. Repair the
harness or con-
nector in the
reverse inhibitor
control circuit.