Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 262

EN(H4DOTC)(diag)-272

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

CHECK PURGE CONTROL SOLENOID
VALVE 2.
1) Remove the purge control solenoid valve 2.
2) Measure the resistance between purge con-
trol solenoid valve 2 terminals.

Terminals

No. 1 — No. 2:

Is the resistance 10 — 100 Ω? Repair the poor

contact of the
purge control sole-
noid valve 2 con-
nector.

Replace the purge
control solenoid
valve 2. <Ref. to
EC(STI)-11, Purge
Control Solenoid
Valve.> <Ref. to
EC(w/o STI)-11,
Purge Control
Solenoid Valve.>

Step

Check

Yes

EN(H4DOTC)(diag)-273

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

CS:DTC P04AD EVAP SYSTEM PURGE CONTROL VALVE "B" CIRCUIT HIGH

DTC DETECTING CONDITION:

• Detected when 2 consecutive driving cycles with fault occur.

• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-179, DTC P04AD EVAP SYSTEM PURGE CONTROL

VALVE "B" CIRCUIT HIGH, Diagnostic Trouble Code (DTC) Detecting Criteria.>

TROUBLE SYMPTOM:

Improper idling
CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-63,

OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PROCE-

DURE, Inspection Mode.>.

WIRING DIAGRAM:

• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,

Engine Electrical System.>

• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine

Electrical System.>

ECM

22 23

11 12 13 14 15

26 27

16 17 18 19

20 21

29 30 31

32 33

34 35

B135

22 23

11 12 13 14 15

24 25

16 17

18 19 20 21

28 29

30 31

B137

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
42 43

36 37 38 39

48 49 50 51 52 53 54

40 41

44 45

46 47

E52

1 2

D15

B21

E52

R68

B135

R57

R15

B97

B98

R68

1 2

B220

13
14

15 16

25
26

21
22

29
30

32 35

33
34

37
38

11 12

R57

B97

1 2

3 4 5

6 7 8 9 10 11 12

EN-09251

B98

2 3 4 5

6 7 8 9

11 12 13 14

17 18 19 20

15 16

B220

B137

SBF-7

FUSE

(RELAY BLOCK)

MAIN RELAY

BATTERY

PRESSURE CONTROL

SOLENOID VALVE ASSY

PURGE CONTROL

SOLENOID VALVE 2

PURGE CONTROL

SOLENOID VALVE 1

EN(H4DOTC)(diag)-274

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

CHECK HARNESS BETWEEN ECM AND
PURGE CONTROL SOLENOID VALVE 2
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
purge control solenoid valve 2.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM connec-
tor and chassis ground.

Connector & terminal

(B137) No. 15 (+) — Chassis ground (–):

Is the voltage 10 V or more?

Repair the short
circuit to power in
harness between
ECM connector
and purge control
solenoid valve 2
connector.

Go to step

CHECK PURGE CONTROL SOLENOID
VALVE 2.
1) Turn the ignition switch to OFF.
2) Measure the resistance between purge con-
trol solenoid valve 2 terminals.

Terminals

No. 1 — No. 2:

Is the resistance less than 1 Ω? Replace the purge

control solenoid
valve 2. <Ref. to
EC(STI)-11, Purge
Control Solenoid
Valve.> <Ref. to
EC(w/o STI)-11,
Purge Control
Solenoid Valve.>

Repair the poor
contact of ECM
connector.