Subaru 2009 IMPREZA Service Manual page 556

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
X: DTC P0123 THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT
HIGH
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION<Ref. to GD(H4SO)-38, DTC P0123 THROTTLE/PEDAL POSITION SEN-
SOR/SWITCH "A" CIRCUIT HIGH, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Improper idling
• Engine stalls.
• Poor driving performance
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-55,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-44, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
ELECTRONIC
THROTTLE
CONTROL RELAY
29
31
32
30
E E
B220
1 2 9 13 17 21
10 14 18 22
3 4
11 12 15 16 19 20 23 24
5 6
7 8 25 29 33 37
26 30 34 38
27 28 31 32 35 36 39 40
B220
38 37
B220 MAIN RELAY
ECM
A: B134 C: B136 D: B137
ELECTRONIC
E57
THROTTLE CONTROL
B122
1 2 3 4
1 2 3 4 5 6 7 8 9 10 11
5 6 7 8
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
34 35 36
42 43
48 49
EN(H4SO)(diag)-139
4 3
FUSE
B220
(RELAY BLOCK)
*
*
B122
B21
E2
E
*
B21
1 2 3 4 5 6
37 38 39 40 41
44 45 46 47
50 51 52 53 54
C: B136
1 2 3
7 8 9 10 11 12
17 18 19 20 21
28 29 30
ENGINE (DIAGNOSTICS)
BATTERY
SBF-7
: TERMINAL No. OPTIONAL ARRANGEMENT
E57 B134
A:
1 2 3 4
8 9 10 11 12 13 14 15
18 19 20 21 22 23 24
28 29 30 31 32
D: B137
1 2 3
4 5 6
13 14 15 16 8 9 10 11 12
22 23 24 25 26 27 18 19 20 21
31 32 33 34 35 26 27
E
5 6 7
16 17
25 26 27
33 34
4 5 6 7
13 14 15 16 17
22 23 24 25
28 29 30 31
EN-06637