Subaru Forester 2004 Service Manual page 104

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
WIRING DIAGRAM:
ELECTRONIC
THROTTLE
CONTROL
B309
RELAY
2
1
3
4
B: B135
B317
E56
E
E
ELECTRONIC
E57
THROTTLE
CONTROL
Step
1 CHECK SENSOR OUTPUT.
1) Turn the ignition switch to ON.
2) Read the data of main throttle sensor signal
using Subaru Select Monitor.
3) Check the voltage change by shaking the har-
ness and connector of ECM, engine harness con-
nector and electronic throttle control connector.
MAIN RELAY
5
3
B47
ECM
C: D: B137
B136
B22
E3
E
EN(H4DOTC 2.5)-103
BATTERY
SBF-5
2
B83
3
1
B122
2
B21
E2
Check
Is the voltage less than 4.63
V?
ENGINE (DIAGNOSTIC)
E
B309
1 2
3 4
B21
1 2
1 2 3 4
5
5 6 7 8
9 10
9 10 11 12
13
13 14 15 16
17 18
B83 E57
1 2 3 4 5 6
B122
1 2 3 4
5 6 7 8
B: B135
1 2 3 4
8 9 10 11 12 13 14 15
20 21 22 23 24
28 29 30 31 32 33
C: B136
1 2 3 4
7 8 9 10 11 12 13 14 15
17 18 19 20 21 22 23
28 29 30 31
D: B137
1 2 3 4 5
8 9 10 11 12 13 14 15
18 19 20 21 22 23
26 27 28 29
Yes
Go to step 2. Go to step 3.
B317
1 2
3 4
B22
3 4
6 7 8
11 12
14 15 16
19 20
B47
1 2
3 4
5 6
5 6 7
16 17 18 19
25 26 27
34 35
5 6
16
24 25 26 27
32 33 34 35
6 7
16 17
24 25
30 31
EN-02364
No