1999 SUBARU LEGACY sensor

2) Disconnect connector from idle air control sole-
noid valve.
B2M2377
3) Remove idle air control solenoid valve from
throttle body.
B2M2378
4) Installation is in the reverse order of removal.
CAUTION:
Replace gasket with a new one.
Tightening torque:
6.0
±0.8 N´m (0.61±0.08 kg-m, 4.4±0.6 ft-lb)
B2M2378
3. 2500 cc MODEL
1) Disconnect battery ground cable.
B2M1723
2) Loosen clamp which connects air intake duct to
mass air flow sensor.
S2M0080
3) Loosen clamp which connects air intake cham-
ber to throttle body.
S2M0096
4) Disconnect blow-by hose and air hose, and
remove air intake chamber and air intake duct as
a unit.
S6M0007
76
2-7[W12A3]SERVICE PROCEDURE
12. Idle Air Control Solenoid Valve

3) Disconnect air by-pass hose from air intake
duct.
S2M0102A
4) Slowly pour one can (16 oz) of cleaner into by-
pass air hole.
Cleaner:
Part No. 1050002 GM Top Engine Cleaner
Part No. X66-A AC Delco Carburetor
Tune-up Conditioner
S2M0103
5) Leave the engine running for five minutes.
NOTE:
Let white smoke come out from muffler until the
cleaner is used up.
6) Stop the engine.
7) Release the throttle valve.
8) Connect air by-pass hose to air intake duct.
S2M0102A
9) Check duty ratio of idle air control solenoid
valve using Subaru Select Monitor.
NOTE:
For detailed operation procedures, refer to the
Subaru Select Monitor Operation Manual.(1) Insert the cartridge to Subaru Select Moni-
tor.
ST 24082AA090 CARTRIDGE
S2M0286A
(2) Connect Subaru Select Monitor to the data
link connector.
(3) Turn ignition switch to ON, and Subaru
Select Monitor switch to ON.
(4) Select {2. Each System Check} in Main
Menu.
(5) Select {EGI/EMPI} in Selection Menu.
(6) Select {1. Current Data Display & Save} in
EGI/EMPI Diagnosis.
(7) Select {1.12 Data Display} in Data Display
Menu.
(8) Adjust throttle position sensor to the proper
position to match with the following specifica-
tion.
ISC valve duty ratio: 25 Ð 40%
S2M0098
78
2-7[W12B0]SERVICE PROCEDURE
12. Idle Air Control Solenoid Valve

(2) Remove resonator chamber.
B2M2306
5) Remove component parts of air intake system.
(Except California spec. vehicles)
(1) Disconnect connector from mass air flow
sensor.
B2M2018
(2) Remove air intake duct and air cleaner
upper cover as a unit, and remove air cleaner
element.
B2M2020
6) Remove spark plug cords from spark plugs (#1
and #3 cylinders).
B2M2014
7) Remove power steering pump from bracket.
(1) Remove V-belt covers.
B2M2307
(2) Loosen lock bolt and slider bolt, and remove
power steering pump drive V-belt.
B2M2308
(3) Remove bolts which secure power steering
pipe brackets to intake manifold.
B2M2309
(4) Remove bolts which install power steering
pump to bracket.
B2M2310
80
2-7[W14A1]SERVICE PROCEDURE
14. Fuel Injector

19. Knock Sensor
A: REMOVAL
1. 2200 cc MODEL
1) Disconnect battery ground cable from battery
ground terminal.
B2M1723
2) Remove air cleaner assembly.
(California spec. vehicles only)

B2M2320
3) Remove air intake chamber.
(Except California spec. vehicles)

B2M2301
4) Remove band which holds knock sensor
harness, and disconnect connector from knock
sensor.
B2M2327A
5) Remove knock sensor from cylinder block.
B2M2316
2. 2500 cc MODEL
1) Disconnect battery ground cable from battery
ground terminal.
B2M1723
90
2-7[W19A1]SERVICE PROCEDURE
19. Knock Sensor

2) Remove air intake chamber.

B2M1683
3) Remove operating cylinder. (MT vehicles only)

B2M1179D
NOTE:
Place the operating cylinder where it will not inter-
fere the work in process.
B2M1684
4) Disconnect knock sensor connector.
B2M1686
5) Remove knock sensor from cylinder block.
B2M1682
B: INSTALLATION
1. 2200 cc MODEL
1) Install knock sensor to cylinder block.
NOTE:
The knock sensor cord which is extracted from the
sensor must be positioned at a 45É angle against
the rear side of the engine.
Tightening torque:
23.5
±2.9 N´m (2.4±0.3 kg-m, 17.3±2.1 ft-lb)
B2M2316
2) Connect knock sensor connector and hold
knock sensor harness with band.
3) Install air intake chamber. (Except California
spec. vehicles)
B2M2301
91
[W19B1]2-7SERVICE PROCEDURE
19. Knock Sensor

4) Install air cleaner assembly. (California spec.
vehicles only)
B2M2320
5) Connect battery ground cable to battery ground
terminal.
B2M1723
2. 2500 cc MODEL
1) Install knock sensor to cylinder block.
NOTE:
The knock sensor cord which is extracted from the
sensor must be positioned at a 45É angle against
the rear side of the engine.
Tightening torque:
23.5
±2.9 N´m (2.4±0.3 kg-m, 17.3±2.1 ft-lb)
B2M1682A
2) Connect knock sensor connector.
B2M1686
NOTE:
The knock sensor connector must be connected
behind the engine coolant hose within the engine
components.
B2M1688A
B2M1689A
92
2-7[W19B2]SERVICE PROCEDURE
19. Knock Sensor

3) Install operating cylinder. (MT vehicles only)
NOTE:
Apply grease to contact point of release lever and
operating cylinder rod.
Tightening torque:
37
±3 N´m (3.8±0.3 kg-m, 27.3±2.2 ft-lb)
B2M1179E
4) Install air intake chamber. [W18A0].>
B2M1683
5) Connect battery ground cable to battery ground
terminal.
B2M1723
20. Intake Manifold Pressure
Sensor (2200 cc California
Spec. Vehicles only)
A: REMOVAL AND INSTALLATION
1) Disconnect battery ground cable.
B2M1723
2) Remove idle air control solenoid valve. 2-7 [W12A1].>
B2M2364
3) Disconnect connector from intake manifold
pressure sensor.
B2M2372
93
[W20A0]2-7SERVICE PROCEDURE
20. Intake Manifold Pressure Sensor (2200 cc California Spec. Vehicles only)

3) Install operating cylinder. (MT vehicles only)
NOTE:
Apply grease to contact point of release lever and
operating cylinder rod.
Tightening torque:
37
±3 N´m (3.8±0.3 kg-m, 27.3±2.2 ft-lb)
B2M1179E
4) Install air intake chamber. [W18A0].>
B2M1683
5) Connect battery ground cable to battery ground
terminal.
B2M1723
20. Intake Manifold Pressure
Sensor (2200 cc California
Spec. Vehicles only)
A: REMOVAL AND INSTALLATION
1) Disconnect battery ground cable.
B2M1723
2) Remove idle air control solenoid valve. 2-7 [W12A1].>
B2M2364
3) Disconnect connector from intake manifold
pressure sensor.
B2M2372
93
[W20A0]2-7SERVICE PROCEDURE
20. Intake Manifold Pressure Sensor (2200 cc California Spec. Vehicles only)