Subaru Forester 2004 Service Manual page 88

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
H: DTC P0108 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE
CIRCUIT HIGH INPUT
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC 2.5)-42,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC 2.5)-35, OPERATION,
Inspection Mode.>.
WIRING DIAGRAM:
E21
1 2 3
Step
1 CHECK INPUT SIGNAL FROM ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 16 (+) — Chassis ground (
THROTTLE BODY
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
2
1
B122
B136 ECM
B122
1 2
1 2 3 4
5
5 6 7 8
9 10
13
17 18
Is the voltage more than 4.5 V? Go to step 3.
−
):
EN(H4DOTC 2.5)-87
E21
E3
B22
B22
3 4
1 2
6 7 8
7 8 9 10
11 12
17 18 19 20 21
14 15 16
28 29 30
19 20
Check
ENGINE (DIAGNOSTIC)
B136
3 4 5 6
11 12 13 14 15 16
22 23 24 25 26 27
31 32 33 34 35
EN-02323
Yes No
Go to step 2.