Subaru 2009 IMPREZA Service Manual page 656

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
CD:DTC P0851 PARK/NEUTRAL SWITCH INPUT CIRCUIT LOW (AT MODEL)
DTC DETECTING CONDITION:
• Detected when two consecutive driving cycles with fault occur.
• GENERAL DESCRIPTION<Ref. to GD(H4SO)-152, DTC P0851 PARK/NEUTRAL SWITCH INPUT CIR-
CUIT LOW (AT MODEL), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Improper idling
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:
C: B136
MT
ECM
* : TERMINAL No. OPTIONAL ARRANGEMENT
B25 T2 T2 B25
2 1
NEUTRAL
POSITION
SWITCH
12 6
11 9
B12 T3 T7
TO STARTER RELAY
EN(H4SO)(diag)-239
B122
*
*
INHIBITOR
SWITCH
P R N D
STARTER MOTOR
(MAGNET)
M
B14
ENGINE (DIAGNOSTICS)
C: B136
1 2 3 4 5 6
7 8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35
B25
1 2
B12
1 2 3 4
5 6 7 8
9 10 11 12
T7
1 2 3 4 5
6 7 8 9
B122
1 2 3 4
5 6 7 8
EN-06642