Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 35
FU(STI)-52
Wastegate Control Solenoid Valve
FUEL INJECTION (FUEL SYSTEMS)
15.Wastegate Control Solenoid
Valve
A: REMOVAL
1) Disconnect the ground cable from battery.
2) Remove the vacuum hose from clip (A), and re-
move the bolt (B) which secures the wastegate
control solenoid valve.
3) Remove the bolts (C) which secure solenoid
valve bracket onto intake manifold.
4) Disconnect the connector (A) from the waste-
gate control solenoid valve.
5) Disconnect the vacuum hose (B) and air control
hose (C) from the wastegate control solenoid valve,
and remove the wastegate control solenoid valve.
B: INSTALLATION
Install in the reverse order of removal.
Tightening torque:
T1: 6.4 N·m (0.7 kgf-m, 4.7 ft-lb)
T2: 19 N·m (1.9 kgf-m, 14.0 ft-lb)
C: INSPECTION
1. WASTEGATE CONTROL SOLENOID
VALVE
1) Check that the wastegate control solenoid valve
has no deformation, cracks or other damages.
2) Check the resistance between the wastegate
control solenoid valve terminals.
3) Check that air does not come out from (B) when
air is blown into (A).
IN-00203
FU-06585
(A)
(C)
(B)
(C)
FU-06586
(A)
(B)
(C)
Terminal No.
Standard
1 and 2
28±2 Ω (when 20°C (68°F))
FU-06587
T1
T1
T2
2 1
EC-02426
FU-04069
(A)
(B)
FU(STI)-53
Wastegate Control Solenoid Valve
FUEL INJECTION (FUEL SYSTEMS)
4) Connect the battery positive terminal to the ter-
minal No. 1 and the battery ground terminal to the
terminal No. 2. Check that air is discharged from
(B), when supplying air to (A).
2. OTHER INSPECTIONS
Check that the vacuum hose and air control hose
have no cracks, damage or loose part.
FU-04070
2 1
(A)
(B)
FU(STI)-54
Front Oxygen (A/F) Sensor
FUEL INJECTION (FUEL SYSTEMS)
16.Front Oxygen (A/F) Sensor
A: REMOVAL
1) Disconnect the ground cable from battery.
2) Disconnect the connector from the front oxygen
(A/F) sensor, and remove the clip (A) holding the
return hose and front oxygen (A/F) sensor harness.
3) Remove the clips (A) holding the front oxygen
(A/F) sensor harness to the engine harness stay.
4) Lift up the vehicle.
5) Remove the under cover. <Ref. to EI-28, RE-
6) Apply spray-type lubricant to the threaded por-
tion of front oxygen (A/F) sensor, and leave it for
one minute or more.
7) Remove the front oxygen (A/F) sensor.
CAUTION:
When removing the front oxygen (A/F) sensor,
wait until exhaust pipe cools, otherwise it will
damage the exhaust pipe.
B: INSTALLATION
CAUTION:
If lubricant is spilt onto the exhaust pipe, wipe it
off completely with cloth to avoid emission of
smoke or causing a fire.
1) Before installing front oxygen (A/F) sensor, ap-
ply anti-seize compound only to the threaded por-
tion of front oxygen (A/F) sensor to make the next
removal easier.
CAUTION:
Never apply anti-seize compound to the protec-
tor of front oxygen (A/F) sensor.
Anti-seize compound:
NEVER-SEEZ NSN, JET LUBE SS-30 or
equivalent
2) Install the front oxygen (A/F) sensor.
Tightening torque:
30 N·m (3.1 kgf-m, 22.1 ft-lb)
3) Install the under cover. <Ref. to EI-28, INSTAL-
4) Lower the vehicle.
IN-00203
FU-03602
(A)
FU-05872
(A)
FU-04607
FU-04607
FU(STI)-55
Front Oxygen (A/F) Sensor
FUEL INJECTION (FUEL SYSTEMS)
5) Secure the front oxygen (A/F) sensor harness to
the engine harness stay using the clips (A).
6) Connect the connector to the front oxygen (A/F)
sensor, and secure the return hose and front oxy-
gen (A/F) sensor harness using the clip (A).
7) Connect the battery ground terminal.
C: INSPECTION
1) Check that the front oxygen (A/F) sensor has no
deformation, cracks or other damages.
2) Measure the resistance between front oxygen
(A/F) sensor terminals.
FU-05872
(A)
FU-03602
(A)
IN-00203
Terminal No.
Standard
1 and 2
2.4±0.24 Ω
(when 20°C (68°F))
1 2
3 4
FU-04072
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