1999 SUBARU LEGACY sensor

C: 2500 cc MODEL
H2M1731C
(1) Mass air flow sensor bracket
(2) Mass air flow sensor ASSY
(3) Air cleaner upper cover
(4) Air cleaner element
(5) Spacer
(6) Bush(7) Clip
(8) Air cleaner case
(9) Cushion rubber
(10) Air intake duct
(11) Resonator chamber ASSY
(12) ClipTightening torque: N´m (kg-m, ft-lb)
T1:
7.4±2.0 (0.75±0.2, 5.4±1.4)
T2:33±10 (3.4±1.0, 25±7)
13
[C3C0]2-7COMPONENT PARTS
3. Air Cleaner

4. Crankshaft Position, Camshaft Position and Knock Sensors
A: 2200 cc MODEL
B2M2282A
(1) Crankangle position sensor
(2) Knock sensor
(3) Camshaft position sensor
(4) Camshaft position sensor sup-
portTightening torque: N´m (kg-m, ft-lb)
T1:
6.4±0.5 (0.65±0.05, 4.7±0.4)
T2:23.5±2.9 (2.4±0.3, 17.3±2.1)
14
2-7[C4A0]COMPONENT PARTS
4. Crankshaft Position, Camshaft Position and Knock Sensors

B: 2500 cc MODEL
B2M1678A
(1) Crankangle position sensor
(2) Knock sensor
(3) Camshaft position sensorTightening torque: N´m (kg-m, ft-lb)
T1:
6.4±0.5 (0.65±0.05, 4.7±0.4)
T2:23.5±2.9 (2.4±0.3, 17.3±2.1)
15
[C4B0]2-7COMPONENT PARTS
4. Crankshaft Position, Camshaft Position and Knock Sensors

1. Air Cleaner and Air Intake
Duct
A: REMOVAL AND INSTALLATION
1. 2200 cc CALIFORNIA SPEC. VEHICLES
1) Disconnect battery ground cable.
B2M1723
2) Remove bolt which installs air intake duct (A)
on the front side of body.
B2M2283A
3) Remove bolt which installs air intake duct (B)
on body.
B2M2284A
4) Remove air intake duct (A) and (B) as a unit.
B2M2012
5) Disconnect connector from intake air tempera-
ture sensor.
B2M2285
6) Loosen clamp which connects air cleaner case
to throttle body.
B2M2286
7) Disconnect hoses from air cleaner case.
8) Remove bolts which install air cleaner case to
stays.
9) Remove air cleaner assembly.
B2M2287
10) Installation is in the reverse order of removal.
16
2-7[W1A1]SERVICE PROCEDURE
1. Air Cleaner and Air Intake Duct

2. Mass Air Flow Sensor
(Except 2200 cc California
Spec. Vehicles)
A: REMOVAL AND INSTALLATION
1. 2200 cc MODEL
1) Disconnect battery ground cable.
B2M1723
2) Disconnect connector from mass air flow sen-
sor.
B2M2018
3) Loosen clamp which connects air intake duct to
air intake chamber.
B2M2019
4) Remove two clips of air cleaner upper cover.
B2M2289
5) Remove air intake duct and air cleaner upper
cover as a unit.
B2M2020
6) Loosen clamp which connects air intake duct to
mass air flow sensor.
B2M2291
7) Remove mass air flow sensor from air cleaner
upper cover.
B2M2294
19
[W2A1]2-7SERVICE PROCEDURE
2. Mass Air Flow Sensor (Except 2200 cc California Spec. Vehicles)

8) Installation is in the reverse order of removal.
Tightening torque:
7.4
±2.0 N´m (0.75±0.2 kg-m, 5.4±1.4 ft-lb)
CAUTION:
Before installing air cleaner upper cover, align
holes with protruding portions of air cleaner
lower case, then secure upper cover to lower
case.
S2M0180
2. 2500 cc MODEL
1) Disconnect battery ground cable.
B2M1723
2) Loosen clamps which connect air intake duct to
air intake chamber and mass air flow sensor.
S2M0080
3) Disconnect blow-by hose from air intake duct.4) Remove air intake duct.
S2M0081
5) Disconnect connector from mass air flow sen-
sor.
S2M0187
6) Remove two clips, then remove air cleaner
upper cover.
S2M0181
7) Remove mass air flow sensor from air cleaner
upper cover.
G2M0393
20
2-7[W2A2]SERVICE PROCEDURE
2. Mass Air Flow Sensor (Except 2200 cc California Spec. Vehicles)

5) Disconnect connectors from idle air control
solenoid valve (A) and intake manifold pressure
sensor (B).
B2M2296A
(A) Idle air control solenoid valve
(B) Intake manifold pressure sensor
6) Disconnect connector from throttle position
sensor.
B2M2297
7) Disconnect air by-pass hose from idle air con-
trol solenoid valve.
B2M2298
8) Disconnect engine coolant hoses from throttle
body.
B2M2299
9) Remove bolts which install throttle body to
intake manifold.
B2M2300
10) Installation is in the reverse order of removal.
CAUTION:
Always use a new gasket.
Tightening torque:
Throttle body:
22
±2 N´m (2.2±0.2 kg-m, 15.9±1.4 ft-lb)
Air cleaner case:
4.9
±0.5 N´m (0.5±0.05 kg-m, 3.6±0.4 ft-lb)
2. 2200 cc EXCEPT CALIFORNIA SPEC.
VEHICLES
1) Disconnect battery ground cable.
B2M1723
22
2-7[W3A2]SERVICE PROCEDURE
3. Throttle Body

2) Loosen clamps which connect air intake duct to
air intake chamber and mass air flow sensor.
B2M2019
3) Loosen clamp which connects air intake cham-
ber to throttle body.
B2M2769
4) Disconnect blow-by hose and air hoses, and
remove air intake chamber.
B2M2301
5) Disconnect accelerator cable (A).
6) Disconnect cruise control cable (B). (With
cruise control model)
B2M2302A
7) Disconnect connector from throttle position
sensor.
B2M2303
8) Disconnect connector from idle air control sole-
noid valve.
B2M2756
9) Disconnect engine coolant hoses from throttle
body.
B2M2304
10) Remove bolts which install throttle body to
intake manifold.
B2M2305
11) Installation is in the reverse order of removal.
23
[W3A2]2-7SERVICE PROCEDURE
3. Throttle Body