Subaru 2003 LEGACY Service Manual page 72
Transmission section
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- Service manual (4441 pages) ,
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DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
H: DTC 45 INTAKE MANIFOLD PRESSURE SIGNAL (NON-TURBO MODEL)
DIAGNOSIS:
Input signal circuit of TCM from ECM is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock.
WIRING DIAGRAM:
OO : 2.0L AND 2.5L MODEL WITHOUT OBD
WO : 2.0L AND 2.5L MODEL WITH OBD
H6
: 3.0L MODEL
B54
1 2
3 4
5 6
10 11 12
13 14 15 16 17 18
19 20 21
1
CHECK ENGINE GROUND TERMINALS AND
GROUND CIRCUIT OF ECM
<Ref. to AT-52, DTC 31 THROTTLE POSI-
TION SENSOR, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
Is there any trouble?
2
CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM and
ECM.
3) Measure resistance of harness between
TCM and ECM connector.
Connector & terminal
2.0 L and 2.5 L without OBD model:
(B54) No. 1 — (B136) No. 11:
2.0 L and 2.5 L with OBD model:
(B54) No. 1 — (B137) No. 2:
3.0 L model:
(B54) No. 1 — (B135) No. 28:
Is the measured value less than the speci-
fied value?
1
2
3
7
8
9
8
9
10
11 12 13 14 15
21
22
23
24 25
22 23 24
Step
B135 :
H6
ECM
B136
:
OO
B137 :
WO
TCM
B54
:
OO
B136
4
5
6 7
1 2
16 17 18
19 20
5
6
7
26 27
28 29
30
14 15
16 17 18
Value
Ground terminals and ground
circuit has a problem.
1 Ω
AT-70
:
WO
B137
B135
3 4
1
2
3
4
5 6
8
9
10 11 12 13
10
11 12 13 14 15
19 20
20 21
22
23
24
Yes
Repair ground ter-
minal and/or
ground circuit of
ECM.
Go to step 3.
:
H6
7 8
9
16 17 18 19
25
26 27 28
AT-00782
No
Go to step 2.
Repair open circuit
in harness
between TCM and
ECM connector.
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