Subaru 2009 IMPREZA Service Manual page 681

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
WIRING DIAGRAM:
MAIN RELAY
37
38
39
40
B220
EGR
VALVE
E18
ECM
B134
Step
1 CHECK HARNESS BETWEEN ECM AND
EGR VALVE CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from EGR valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
DTC P1493; (B134) No. 8 (+) — Chassis
ground (–):
DTC P1495; (B134) No. 9 (+) — Chassis
ground (–):
DTC P1497; (B134) No. 10 (+) — Chassis
ground (–):
DTC P1499; (B134) No. 20 (+) — Chassis
ground (–):
FUSE
B220
(RELAY BLOCK)
4 3
B21
E2
E2
B21
EN(H4SO)(diag)-264
BATTERY
SBF-7
Check
Is the voltage 10 V or more?
E18
1 2 3
4 5 6
B21
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 36 37 38
42 43 44 45
48 49 50 51 52
B134
1 2 3 4 5
8 9 10 11 12 13 14 15
18 19 20 21 22 23 24
28 29 30 31 32
B220
1 2 9 13
10 14
3 4
11 12 15 16 19
5 6
7 8 25 29
26 30
27 28 31 32 35
E
Yes
Repair the short Repair the poor
circuit to power contact of ECM
supply in harness connector.
between ECM and
EGR valve con-
nector.
39 40 41
46 47
53 54
6 7
16 17
25 26 27
33 34
17 21
18 22
20 23 24
33 37
34 38
36 39 40
EN-06658
No