O2 sensor SUBARU LEGACY 1999 Service Workshop Manual

9) Remove bolts which install throttle body to
intake manifold.
B2M1249
10) Installation is in the reverse order of removal.
CAUTION:
IAlways use a new gasket.
IBefore installing air cleaner upper cover,
align holes with protruding portions of air
cleaner lower case, then secure upper cover to
lower case.
Tightening torque:
Throttle body:
22
±2 N´m (2.2±0.2 kg-m, 15.9±1.4 ft-lb)
Air intake chamber:
4.9
±0.5 N´m (0.5±0.05 kg-m, 3.6±0.4 ft-lb)
4. Intake Manifold
A: REMOVAL
1. 2200 cc CALIFORNIA SPEC. VEHICLES
1) Release fuel pressure.
2) Open fuel flap lid, and remove fuel filler cap.
B2M1746
3) Disconnect battery ground cable.
B2M1723
4) Disconnect connector from intake air tempera-
ture sensor.
B2M2285
25
[W4A1]2-7SERVICE PROCEDURE
4. Intake Manifold

16) Disconnect spark plug cords from ignition coil
and ignitor assembly.
B2M2312
17) Disconnect PCV hose assembly from intake
manifold.
B2M2313
18) Disconnect engine coolant hoses from throttle
body.
B2M2299
19) Disconnect brake booster hose.
B2M2314
20) Remove air cleaner case stay RH and engine
harness bracket, and disconnect engine harness
connectors from bulkhead harness connectors.21) Pull out engine harness connector from
bracket.
B2M2315
22) Disconnect connectors from engine coolant
temperature sensor (A) and thermometer (B).
B2M0345B
23) Disconnect knock sensor connector.
B2M2327A
24) Disconnect connector from camshaft position
sensor.
B2M2317B
28
2-7[W4A1]SERVICE PROCEDURE
4. Intake Manifold

25) Disconnect connector from crankshaft position
sensor.
B2M1252A
26) Disconnect connector from oil pressure
switch.
B2M1253A
27) Disconnect fuel hoses from fuel pipes.
WARNING:
Catch fuel from hoses in a container.
S2M0500
28) Remove eight bolts which hold intake manifold
onto cylinder heads.
B2M2318
29) Remove intake manifold.
B2M0160
2. 2200 cc EXCEPT CALIFORNIA SPEC.
VEHICLES
1) Release fuel pressure.
2) Open fuel flap lid, and remove fuel filler cap.
B2M1746
3) Disconnect battery ground cable.
B2M1723
4) Disconnect connector from mass air flow sen-
sor.
B2M2018
29
[W4A2]2-7SERVICE PROCEDURE
4. Intake Manifold

18) Disconnect PCV hose (A) and pressure regu-
lator vacuum hose (B) from intake manifold.
19) Disconnect vacuum hose (C) to cruise control
diaphragm. (With cruise control models)
S2M0089A
20) Disconnect engine coolant hose from throttle
body.
B2M2304
21) Disconnect brake booster hose.
B2M2314
22) Remove air intake chamber stay RH, engine
harness bracket from transmission housing, and
disconnect engine harness connectors from bulk-
head harness connectors.
B2M2315
23) Disconnect connectors from engine coolant
temperature sensor (A) and thermometer (B).
B2M0345B
24) Disconnect knock sensor connector.
B2M2327A
25) Disconnect connector from camshaft position
sensor.
B2M2317B
32
2-7[W4A2]SERVICE PROCEDURE
4. Intake Manifold

26) Disconnect connector from crankshaft position
sensor.
B2M1252A
27) Disconnect connector from oil pressure
switch.
B2M1253A
28) Disconnect fuel hoses from fuel pipes.
WARNING:
Catch fuel from hoses in a container.
S2M0500
29) Remove bolts which hold intake manifold onto
cylinder heads.
B2M2318
30) Remove intake manifold.
B2M0160
3. 2500 cc MODEL
1) Release fuel pressure.
2) Open fuel flap lid, and remove fuel filler cap.
B2M1746
3) Disconnect battery ground cable.
B2M1723
4) Disconnect connector from mass air flow sen-
sor.
B2M1225A
33
[W4A3]2-7SERVICE PROCEDURE
4. Intake Manifold

20) Remove EGR pipe.
S2M0078
21) Remove engine harness bracket from trans-
mission housing, and disconnect engine harness
connectors from bulkhead harness connectors.
S2M0082A
22) Disconnect connectors from engine coolant
temperature sensor (A) and thermometer (B).
B2M0345B
23) Disconnect knock sensor connector.
B2M1243A
24) Disconnect connector from camshaft position
sensor.
S2M0183
25) Disconnect connector from crankshaft position
sensor.
B2M1252A
26) Disconnect connector from oil pressure switch
B2M1253A
27) Disconnect fuel hoses from fuel pipes.
WARNING:
Catch fuel from hoses in a container.
S2M0090A
36
2-7[W4A3]SERVICE PROCEDURE
4. Intake Manifold

28) Remove bolts which hold intake manifold onto
cylinder heads.
S2M0091
29) Remove intake manifold.
B2M0160
B: DISASSEMBLY
1. 2200 cc CALIFORNIA SPEC. VEHICLES
1) Disconnect engine ground terminal from intake
manifold.
B2M2779
2) Disconnect connector from ignition coil and
ignitor assembly.3) Remove ignition coil and ignitor assembly.
B2M2345
4) Disconnect connectors from throttle position
sensor (A), idle air control solenoid valve (B) and
intake manifold pressure sensor (C).
5) Disconnect air by-pass hose (D) from idle air
control solenoid valve.
B2M2346A
6) Remove throttle body.
B2M2300
7) Disconnect connectors from fuel injectors, and
purge control solenoid valve.
37
[W4B1]2-7SERVICE PROCEDURE
4. Intake Manifold

16) Remove fuel injector pipe.
B2M2781
17) Remove fuel pipes, etc. from intake manifold.
B2M2788A
(A) Pressure regulator
(B) Fuel pipe ASSY
2. 2200 cc EXCEPT CALIFORNIA SPEC.
VEHICLES
1) Remove engine ground terminal from intake
manifold.
B2M2779
2) Disconnect connector from ignition coil and
ignitor assembly.3) Remove ignition coil and ignitor assembly.
B2M2345
4) Disconnect connectors from throttle position
sensor (A) and idle air control solenoid valve (B).
B2M2357A
5) Remove throttle body.
B2M2305
6) Disconnect connectors from fuel injectors, and
purge control solenoid valve.
39
[W4B2]2-7SERVICE PROCEDURE
4. Intake Manifold

15) Remove fuel injector pipe.
B2M2789
16) Remove fuel pipes, etc. from intake manifold.
B2M2356A
(A) Pressure regulator
(B) Fuel pipe ASSY
3. 2500 cc MODEL
1) Disconnect engine ground terminal from intake
manifold.
B2M1724
2) Disconnect EGR vacuum hose from EGR
valve.
3) Disconnect back pressure hose from pipe.
4) Disconnect BPT hoses from EGR solenoid
valve and intake manifold.
5) Remove BPT with BTP holder bracket.
6) Remove EGR valve.
B2M1727
7) Disconnect connectors from throttle position
sensor, ignition coil, fuel injectors, idle air control
solenoid valve, purge control solenoid valve and
EGR solenoid valve.
B2M0347C
(A) EGR solenoid valve
(B) Throttle position sensor
(C) Idle air control solenoid valve
(D) Purge control solenoid valve
(E) Harness band
8) Remove engine harness from intake manifold.
9) Remove idle air control solenoid valve from
intake manifold.
H2M1247
41
[W4B3]2-7SERVICE PROCEDURE
4. Intake Manifold

12) Assemble throttle body to intake manifold.
CAUTION:
Replace gasket with a new one.
Tightening torque:
22
±2 N´m (2.2±0.2 kg-m, 15.9±1.4 ft-lb)
B2M2300
13) Connect connectors to throttle position sensor
(A), idle air control solenoid valve (B) and intake
manifold pressure sensor (C).
14) Connect air by-pass hose (D) to idle air con-
trol solenoid valve.
B2M2346A
15) Install ignition coil and ignitor assembly.
16) Connect connector to ignition coil and ignitor
assembly.
B2M2345
17) Install engine ground terminal to intake mani-
fold.
Tightening torque:
19
±1.5 N´m (1.9±0.15 kg-m, 13.7±1.1 ft-lb)
B2M2779
2. 2200 cc EXCEPT CALIFORNIA SPEC.
VEHICLES
1) Assemble fuel pipes, etc. to intake manifold.
B2M2356A
(A) Pressure regulator
(B) Fuel pipe ASSY
2) Install fuel injector pipe.
B2M2789
44
2-7[W4C2]SERVICE PROCEDURE
4. Intake Manifold