Subaru Legacy 2002 Service Manual page 1817

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Automatic Transmission (Diagnostics)
No.
1 CHECK ENGINE GROUND TERMINALS.
2 CHECK GROUND CIRCUIT OF ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
ECM and engine ground.
Connector & terminal
Except 3.0 L model:
(B134) No. 27 — Engine ground:
(B134) No. 8 — Engine ground:
(B134) No. 7 — Engine ground:
(B136) No. 21 — Engine ground:
(B136) No. 22 — Engine ground:
(B134) No. 35 — Engine ground:
(B134) No. 34 — Engine ground:
(B135) No. 6 — Engine ground:
3.0 L model:
(B134) No. 7 — Engine ground:
(B134) No. 22 — Engine ground:
(B136) No. 8 — Engine ground:
(B136) No. 17 — Engine ground:
(B136) No. 18 — Engine ground:
(B137) No. 8 — Engine ground:
(B137) No. 9 — Engine ground:
(B137) No. 21— Engine ground:
(B137) No. 31 — Engine ground:
3 CHECK THROTTLE POSITION SENSOR.
1) Disconnect connector from throttle position
sensor.
2) Measure resistance between throttle posi-
tion sensor connector receptacle's terminals.
Terminals
Except 3.0 L model:
No. 4 — No. 2:
3.0 L model:
No. 1 — No. 3:
4 CHECK THROTTLE POSITION SENSOR.
Measure resistance between throttle position
sensor connector receptacle's terminals.
Terminals
Except 3.0 L model:
No. 2 — No. 3:
3.0 L model:
No. 1 — No. 2:
5 CHECK HARNESS CONNECTOR
BETWEEN TCM AND THROTTLE POSITION
SENSOR.
1) Disconnect connector from TCM.
2) Measure resistance of harness between
TCM and throttle position sensor connector.
Connector & terminal
Except 3.0 L model:
(B55) No. 3 — (E13) No. 3:
3.0 L model:
(B55) No. 3 — (E13) No. 2:
Step
Have engine ground termi-
nals been tightened?
Is the resistance less than
5 Ω?
Is the resistance between
3.0 and 4.2 kΩ?
Is the resistance between
0.35 and 0.5 kΩ?
Is the resistance less than
1 Ω?
AT-48
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
No
Tighten engine
ground terminals.
Repair open cir-
cuit in harness
between ECM
connector and
engine grounding
terminal.
Replace throttle
position sensor.
Replace throttle
position sensor.
Repair open cir-
cuit in harness
between TCM and
throttle position
sensor connector,
and poor contact
in coupling con-
nector.