Subaru 2002 IMPREZA Service Manual page 654

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
AY:DTC P0604 — INTERNAL CONTROL MODULE MEMORY CHECK SUM ER-
ROR —
• DTC DETECTING CONDITION:
• Immediately at fault recognition.
• TROUBLE SYMPTOM:
• Engine does not start.
• Engine stalls.
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN-49, OPERATION,
Clear Memory Mode.> and Inspection Mode <Ref. to EN-42, OPERATION, Inspection Mode.> .
• WIRING DIAGRAM:
MAIN RELAY
4
6
5
3
2
1
B47
F44
B72
1 2 3 4
1 2
5 6 7 8
3 4
A:
B134
1 2 3 4 5 6
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
Step
1 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODE (DTC) ON DISPLAY.
TO FRONT OXYGEN (A/F) SENSOR
No.11
4
A: B134
B: B135 ECM
C:
B136
B22
E3
B47 B22
1 2
1 2 3 4
3 4
5 6 7 8
5 6
9 10 11 12
13 14 15 16
7 8
34 35
LHD LHD
2
B61 F44
IGNITION
B72
SWITCH
SBF-4
1
1 AT MODEL: B6
MT MODEL: B25
B: B135
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
Check
Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC P0604?
EN-222
SBF-5
BATTERY
SBF-1
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
Yes
Replace the ECM. It is not necessary
<Ref. to FU-51, to inspect DTC
Engine Control P0604.
Module.>
30
EN1397
No