Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 26
FU(STI)-16
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(STI)-17
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(STI)-67,
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(STI)-13, DRAINING OF
ENGINE COOLANT, REPLACEMENT, Engine
9) Remove the air intake duct. <Ref. to IN(STI)-10,
10) Remove the air intake boot.
11) Remove the intercooler. <Ref. to IN(STI)-12,
12) Remove the generator. <Ref. to SC(STI)-21,
13) Remove the coolant filler tank. <Ref. to
CO(STI)-28, REMOVAL, Coolant Filler Tank.>
14) Disconnect the A/C pressure hoses from A/C
compressor. <Ref. to AC-41, REMOVAL, Hose and
15) Disconnect the engine coolant hose from throt-
tle body.
16) Disconnect the brake booster vacuum hose (A)
and pressure regulator vacuum hose (B) from the
intake manifold.
17) Disconnect the connector from the PCV hose
assembly A.
FU-03487
IN-00203
LU-02413
FU-05761
ME-05007
E N G
(A)
(B)
FU-06567
FU(STI)-18
Intake Manifold
FUEL INJECTION (FUEL SYSTEMS)
18) Remove the PCV hose assembly A from clip
(A), and remove the vacuum hose from clip (B).
19) Disconnect the vacuum hose (A) and the con-
nector (B) from the PCV hose assembly B.
20) Disconnect the air control hose (A) from the
waste gate actuator, and loosen the clamp which
holds the intake duct to the turbocharger.
21) Remove the engine coolant hose from the wa-
ter tank pipe.
22) Remove the engine harness from clip (A).
23) Disconnect the bulkhead harness connectors
from the engine harness connectors.
24) Remove the engine harness connector from
the engine harness bracket.
25) Disconnect the connector (A) from the engine
coolant temperature sensor, connector (B) from the
oil pressure switch, and connector (C) from the
crankshaft position sensor.
FU-06568
(A)
(B)
(A)
(B)
FU-06566
FU-04384
(A)
FU-06569
FU-06570
(A)
FU-06571
FU-06572
(C)
(A)
(B)
FU-05725
FU(STI)-19
Intake Manifold
FUEL INJECTION (FUEL SYSTEMS)
26) Disconnect the connector from power steering
pump switch.
27) Disconnect the connector from the knock sen-
sor.
28) Disconnect the connector from the secondary
air combination valve.
29) Disconnect the connector from the intake cam-
shaft position sensor.
30) Disconnect the connector from the intake oil
flow control solenoid valve.
31) Lift up the vehicle.
FU-04598
FU-03492
FU-03493
FU-04385
FU-03495
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