Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 276
EN(H4DOTC)(diag)-328
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
WIRING DIAGRAM:
• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,
• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine
ECM
E2
B21
A25
D11
A26
A23
A19
D10
A29
A24
1 2 3
4 5
E51
E55
B134
A:
B137
D:
8
16
19
29
2
8
27
6
30
4
2
1
3
5
E55
4
2
1
3
5
E51
5
6
7
8
2
1
9
4
3
10
22 23
11 12 13 14 15
24 25
26
16 17
18 19 20 21
27
28 29
30 31
B137
D:
5
6
7
8
2
1
9
4
3
10
24
22 23
25
11 12 13 14 15
26 27
28
16 17
18 19 20 21
33 34
29
32
30 31
B134
A:
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
EN-09253
TUMBLE GENERATOR
VALVE ACTUATOR LH
TUMBLE GENERATOR
VALVE ACTUATOR RH
EN(H4DOTC)(diag)-329
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK CURRENT DATA.
1) Start the engine.
2) Read the value of «TGV Position Sensor R»
using the Subaru Select Monitor.
NOTE:
Is the value of «TGV Position
Sensor R» 5 V or more?
Even if DTC is
detected, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the failure,
and then perform
the diagnosis
again.
NOTE:
In this case, tem-
porary poor con-
tact of connector,
temporary open or
short circuit of har-
ness may be the
cause.
2
CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ASSEMBLY
RH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble gen-
erator valve assembly RH.
3) Start the engine.
4) Read the value of «TGV Position Sensor R»
using the Subaru Select Monitor.
NOTE:
Is the value of «TGV Position
Sensor R» 5 V or more?
Repair the short
circuit to power in
harness between
ECM connector
and tumble gener-
ator valve assem-
bly RH connector.
3
CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ASSEMBLY
RH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness between
tumble generator valve assembly RH connector
and engine ground.
Connector & terminal
(E55) No. 2 — Engine ground:
Is the resistance less than 5 Ω? Go to step
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM
connector
and tumble gener-
ator valve assem-
bly RH connector
• Poor contact of
ECM connector
• Poor contact of
coupling connector
4
CHECK FOR POOR CONTACT.
Check for poor contact of tumble generator
valve assembly RH connector.
Is there poor contact of the tum-
ble generator valve assembly
RH connector?
Repair the poor
contact of tumble
generator valve
assembly RH con-
nector.
EN(H4DOTC)(diag)-330
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
EA:DTC P2021 TUMBLE GENERATED VALVE POSITION SENSOR 2 CIRCUIT
LOW
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-230, DTC P2021 TUMBLE GENERATED VALVE PO-
SITION SENSOR 2 CIRCUIT LOW, 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(H4DOTC)(diag)-63,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PROCE-
EN(H4DOTC)(diag)-331
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
WIRING DIAGRAM:
• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,
• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine
ECM
E2
B21
A25
D11
A26
A23
A19
D10
A29
A24
1 2 3
4 5
E51
E55
B134
A:
B137
D:
8
16
19
29
2
8
27
6
30
4
2
1
3
5
E55
4
2
1
3
5
E51
5
6
7
8
2
1
9
4
3
10
22 23
11 12 13 14 15
24 25
26
16 17
18 19 20 21
27
28 29
30 31
B137
D:
5
6
7
8
2
1
9
4
3
10
24
22 23
25
11 12 13 14 15
26 27
28
16 17
18 19 20 21
33 34
29
32
30 31
B134
A:
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
EN-09253
TUMBLE GENERATOR
VALVE ACTUATOR LH
TUMBLE GENERATOR
VALVE ACTUATOR RH
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