Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 122
FU(w/o STI)-15
Throttle Body
FUEL INJECTION (FUEL SYSTEMS)
2. Throttle Body
A: REMOVAL
1) Disconnect the ground cable from battery.
2) Lift up the vehicle.
3) Remove the under cover. <Ref. to EI-28, RE-
4) Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt)
of coolant. <Ref. to CO(w/o STI)-13, DRAINING
OF ENGINE COOLANT, REPLACEMENT, Engine
5) Remove the intercooler. <Ref. to IN(w/o STI)-12,
6) Disconnect the connectors from the throttle posi-
tion sensor.
7) Remove the brake booster vacuum hose from
the clip (A), and remove the bolts securing the air
bypass pipe to the intake manifold.
8) Remove the bolts securing the PCV pipe assem-
bly to the intake manifold, and remove the intake
duct from the throttle body.
9) Disconnect the engine coolant hose from throttle
body.
10) Remove the throttle body from the intake man-
ifold.
IN-00203
FU-05668
FU-06527
(A)
FU-06528
FU-05669
FU-06529
FU(w/o STI)-16
Throttle Body
FUEL INJECTION (FUEL SYSTEMS)
B: INSTALLATION
Install in the reverse order of removal.
NOTE:
Use new O-rings.
Tightening torque:
8 N·m (0.8 kgf-m, 5.9 ft-lb)
Tightening torque:
T1: 3 N·m (0.3 kgf-m, 2.2 ft-lb)
T2: 6.4 N·m (0.7 kgf-m, 4.7 ft-lb)
Tightening torque:
6.4 N·m (0.7 kgf-m, 4.7 ft-lb)
C: INSPECTION
1. THROTTLE SENSOR INSPECTION
(METHOD WITH CIRCUIT TESTER)
1) Remove the lower inner trim of passenger’s
side. <Ref. to EI-57, REMOVAL, Lower Inner
2) Turn over the floor mat of passenger’s seat.
3) Remove the protect cover.
4) Remove the nuts and bolts which hold the ECM
to the bracket.
5) Turn the ignition switch to ON. (engine OFF)
FU-06530
T2
T1
FU-06531
FU-06532
FU-03416
FU-03417
FU(w/o STI)-17
Throttle Body
FUEL INJECTION (FUEL SYSTEMS)
6) Measure the voltage between ECM connector
terminals.
7) After inspection, install the related parts in the
reverse order of removal.
Tightening torque:
7.5 N·m (0.8 kgf-m, 5.5 ft-lb)
2. THROTTLE SENSOR INSPECTION
(METHOD WITH SUBARU SELECT MONI-
TOR)
1) Turn the ignition switch to ON. (engine OFF)
2) Read the throttle opening angle signal and volt-
age of throttle sensor using Subaru Select Monitor.
<Ref. to EN(H4DOTC)(diag)-41, READ CURRENT
DATA FOR ENGINE (NORMAL MODE), OPERA-
3. OTHER INSPECTIONS
1) Check that the throttle body has no deformation,
cracks or other damages.
2) Check that the engine coolant hose has no
cracks, damage or loose part.
(A) To ECM connector
Throttle
sensor
Accelerator
pedal
Terminal No.
Standard
Main
Not depressed
(Full closed)
18 (+) and
29 (–)
Approx. 0.6 V
Depressed
(Full opened)
Approx. 3.96 V
Sub
Not depressed
(Full closed)
28 (+) and
29 (–)
Approx. 1.48 V
Depressed
(Full opened)
Approx. 4.17 V
Throttle sensor
Throttle opening
angle signal
Standard
Main
0.0%
Approx. 0.6 V
100.0%
Approx. 3.96 V
Sub
0.0%
Approx. 1.48 V
100.0%
Approx. 4.17 V
FU-04049
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
V
(A)
FU(w/o STI)-18
Intake Manifold
FUEL INJECTION (FUEL SYSTEMS)
3. Intake Manifold
A: REMOVAL
1) Remove the V-belt covers.
2) Collect the refrigerant from A/C system. <Ref. to
AC-19, PROCEDURE, Refrigerant Recovery Pro-
3) Release the fuel pressure. <Ref. to FU(w/o STI)-
65, RELEASING OF FUEL PRESSURE, PROCE-
4) Disconnect the ground cable from battery.
5) Open the fuel filler lid and remove the fuel filler
cap.
6) Lift up the vehicle.
7) Remove the under cover. <Ref. to EI-28, RE-
8) Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt)
of coolant. <Ref. to CO(w/o STI)-13, DRAINING
OF ENGINE COOLANT, REPLACEMENT, Engine
9) Remove the air intake duct and air cleaner case.
<Ref. to IN(w/o STI)-10, REMOVAL, Air Intake
Duct.> <Ref. to IN(w/o STI)-8, REMOVAL, Air
10) Remove the intercooler. <Ref. to IN(w/o STI)-
11) Remove the generator. <Ref. to SC(STI)-21,
12) Remove the coolant filler tank. <Ref. to CO(w/o
STI)-28, REMOVAL, Coolant Filler Tank.>
13) Disconnect the A/C pressure hoses from A/C
compressor. <Ref. to AC-41, REMOVAL, Hose and
14) Disconnect the brake booster vacuum hose.
15) Remove the brake booster vacuum hose from
the clip (A), and remove the bolts securing the air
bypass pipe to the intake manifold.
16) Remove the bolts securing the PCV pipe as-
sembly to the intake manifold, and remove the in-
take duct from the throttle body.
17) Disconnect the engine coolant hose from throt-
tle body.
ME-03386
IN-00203
FU-06533
FU-06527
(A)
FU-06528
FU-05669
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