Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 36
FU(STI)-56
Rear Oxygen Sensor
FUEL INJECTION (FUEL SYSTEMS)
17.Rear Oxygen Sensor
A: REMOVAL
1) Disconnect the ground cable from battery.
2) Lift up the vehicle.
3) Remove the transmission under cover.
4) Disconnect the connector from the rear oxygen
sensor, and remove the clip (A) holding the rear ox-
ygen sensor harness.
5) Apply spray-type lubricant to the threaded por-
tion of rear oxygen sensor, and leave it for one
minute or more.
6) Remove the rear oxygen sensor.
CAUTION:
When removing the rear oxygen sensor, wait
until exhaust pipe cools, otherwise it will dam-
age 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 rear oxygen sensor, apply the
anti-seize compound only to the threaded portion of
rear oxygen sensor to make the next removal eas-
ier.
CAUTION:
Never apply anti-seize compound to the protec-
tor of rear oxygen sensor.
Anti-seize compound:
NEVER-SEEZ NSN, JET LUBE SS-30 or
equivalent
2) Install the rear oxygen sensor.
Tightening torque:
21 N·m (2.1 kgf-m, 15.5 ft-lb)
3) Connect the connector to the rear oxygen sen-
sor, and hold the rear oxygen sensor harness with
the clip (A).
4) Install the transmission under cover.
Tightening torque:
18 N·m (1.8 kgf-m, 13.3 ft-lb)
5) Lower the vehicle.
IN-00203
FU-04602
(A)
FU-05785
FU-05785
FU-04602
(A)
FU(STI)-57
Rear Oxygen Sensor
FUEL INJECTION (FUEL SYSTEMS)
6) Connect the battery ground terminal.
C: INSPECTION
1) Check that the rear oxygen sensor has no defor-
mation, cracks or other damages.
2) Measure the resistance between rear oxygen
sensor terminals.
Terminal No.
Standard
1 and 2
5.6
+0.8
–0.6
Ω
(when 20°C (68°F))
IN-00203
2 1
4 3
FU-04073
FU(STI)-58
SI-DRIVE (SUBARU Intelligent Drive) Selector
FUEL INJECTION (FUEL SYSTEMS)
18.SI-DRIVE (SUBARU Intelli-
gent Drive) Selector
A: REMOVAL
1) Disconnect the ground cable from the battery.
2) Remove the console box. <Ref. to EI-51, RE-
3) Remove the multi-selector switch connector
from the console box.
4) Remove the screws and tabs holding the multi-
selector switch to the console box and the multi-se-
lector switch.
B: INSTALLATION
Install in the reverse order of removal.
Tightening torque:
1.5 N·m (0.2 kgf-m, 1.1 ft-lb)
C: INSPECTION
1) Check that the multi select switch does not have
deformation, cracks, or damage.
2) Check the resistance between the terminals at
the SI-DRIVE selector.
IN-00203
FU-03626
Switch position
Terminal
No.
Standard
Sport (When turning the
SI-DRIVE selector to the
left)
5 and 8
Less than 1 Ω
Intelligent (When press-
ing the SI-DRIVE selector)
1±0.05 kΩ
Sport Sharp (When turn-
ing the SI-DRIVE selector
to the right)
3.67±0.1835 kΩ
4
5
3
2 1
9 8 7 6
10
FU-05693
FU(STI)-59
Engine Control Module (ECM)
FUEL INJECTION (FUEL SYSTEMS)
19.Engine Control Module (ECM)
A: REMOVAL
1) Disconnect the ground cable from battery.
2) Remove the lower inner trim of passenger’s
side. <Ref. to EI-57, REMOVAL, Lower Inner
3) Turn over the floor mat of passenger’s seat.
4) Remove the protect cover.
5) Remove the nuts and bolts which hold the ECM
to the bracket.
6) Disconnect the ECM connectors, and take out
the ECM.
B: INSTALLATION
Install in the reverse order of removal.
CAUTION:
• When the ECM of model with immobilizer has
been replaced, be sure to perform the registra-
tion of immobilizer system. (Refer to “PC appli-
cation help for Subaru Select Monitor”.)
• When replacing the ECM or bracket, replace
both parts with new parts.
• After installing the bracket to the ECM, do not
separate the bracket.
• If the bracket has been installed to the ECM in
the wrong direction, replace both parts with
new parts.
NOTE:
When replacing the ECM, be careful not to use the
wrong spec. ECM to avoid any damage on the fuel
injection system.
Tightening torque:
7.5 N·m (0.8 kgf-m, 5.5 ft-lb)
C: INSPECTION
Check that the ECM has no deformation, cracks or
other damages.
IN-00203
FU-03416
FU-03417
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