O2 sensor SUBARU LEGACY 1999 Service Owner's Guide

5) Disconnect radiator outlet hose (A) and heater
by-pass hose (B) from water pump.
H2M2515A
6) Disconnect connectors from radiator main fan
(A) and sub fan (B) motors.
B2M2035A
7) Lower the vehicles.
8) Remove radiator main fan [W6A0].> and sub fan motor assembly [W7A0].>.
B2M2036
9) Remove V-belts.

B2M2308
10) Remove timing belt.

B2M2037
11) Remove automatic belt tension adjuster.
H2M2375
12) Remove belt idler No. 2.
H2M2518
13) Remove camshaft position sensor.

B2M2038
9
[W2A1]2-5SERVICE PROCEDURE
2. Water Pump

13) Remove belt idler No. 2.
H2M2518
14) Remove camshaft position sensor.

S2M0184
15) Remove left-hand camshaft sprockets by
using ST.
ST 499207300 CAMSHAFT SPROCKET
WRENCH
S2M0019A
16) Remove tensioner bracket.
S2M0020
17) Remove left-hand belt cover No. 2.
S2M0021
18) Remove water pump.
H2M2516
19) Installation is in the reverse order of removal.
CAUTION:
IReplace gasket with a new one.
IWhen installing water pump, tighten bolts in
two stages in alphabetical sequence as shown
in figure.
Tightening torque:
10+4/þ0N´m (1.0+0.4/þ0kg-m, 7.2+2.9/þ0ft-lb)
S2M0760A
B: INSPECTION
1) Check water pump bearing for smooth rotation.
2) Check water pump pulley for abnormalities.
12
2-5[W2B0]SERVICE PROCEDURE
2. Water Pump

1. Engine Cooling System Trouble in General
TroubleCorrective action
Over-heatinga. Insufficient engine coolantReplenish engine coolant, inspect for leakage, and
repair.
b. Loose timing belt Repair or replace timing belt tensioner.
c. Oil on drive belt Replace.
d. Malfunction of thermostat Replace.
e. Malfunction of water pump Replace.
f. Clogged engine coolant passage Clean.
g. Improper ignition timingInspect and repair ignition control system.
On-Board Diagnostics II System
h. Clogged or leaking radiator Clean or repair, or replace.
i. Improper engine oil in engine coolant Replace engine coolant.
j. Air/fuel mixture ratio too leanInspect and repair fuel injection system.
On-Board Diagnostics II System
k. Excessive back pressure in exhaust system Clean or replace.
l. Insufficient clearance between piston and cylinder Adjust or replace.
m. Slipping clutch Repair or replace.
n. Dragging brake Adjust.
o. Improper transmission oil Replace.
p. Defective thermostat Replace.
q. Malfunction of electric fanInspect radiator fan relay, engine coolant temperature
sensor or radiator motor and replace there.
Over-coolinga. Atmospheric temperature extremely low Partly cover radiator front area.
b. Defective thermostat Replace.
Engine coolant
leaks.a. Loosened or damaged connecting units on
hosesRepair or replace.
b. Leakage from water pump Replace.
c. Leakage from water pipe Repair or replace.
d. Leakage around cylinder head gasket Retighten cylinder head bolts or replace gasket.
e. Damaged or cracked cylinder head and crank-
caseRepair or replace.
f. Damaged or cracked thermostat case Repair or replace.
g. Leakage from radiator Repair or replace.
Noisea. Defective drive belt Replace.
b. Defective radiator fan Replace.
c. Defective water pump bearing Replace water pump.
d. Defective water pump mechanical seal Replace water pump.
26
2-5[K100]DIAGNOSTICS
1. Engine Cooling System Trouble in General

(1) Intake manifold gasket LH
(2) Intake manifold gasket RH
(3) Fuel injector pipe
(4) O-ring A
(5) O-ring B
(6) Fuel injector
(7) Insulator
(8) Fuel injector cap
(9) Nipple (AT vehicles)
(10) Plug
(11) PCV valve
(12) Purge control solenoid valve(13) Nipple
(14) Pressure sensor
(15) Pressure sources switching sole-
noid valve
(16) Vacuum hose A
(17) Vacuum hose B
(18) Vacuum hose C
(19) Bracket (Except Canada spec.
vehicles)
(20) Bracket (For Canada spec.
vehicles)
(21) Intake manifold(22) Fuel pipe protector LH (LHD
model)
(23) Fuel pipe protector RH (RHD
model)
Tightening torque: N´m (kg-m, ft-lb)
T1:
4.9±0.5 (0.5±0.05, 3.6±0.4)
T2:23±3 (2.3±0.3, 16.6±2.2)
T3:25±2 (2.5±0.2, 18.1±1.4)
T4:3.4±0.5 (0.35±0.05, 2.5±0.4)
T5:15.7±1.5 (1.6±0.15, 11.6±1.1)
5
[C1B0]2-7COMPONENT PARTS
1. Intake Manifold

(1) Intake manifold gasket LH
(2) Intake manifold gasket RH
(3) Fuel injector pipe insulator
(4) Fuel injector pipe
(5) O-ring A
(6) O-ring B
(7) Fuel injector
(8) Insulator
(9) Fuel injector cap
(10) Plate
(11) Sealing
(12) Gasket
(13) Engine coolant hose B
(14) Air by-pass hose
(15) Idle air control solenoid valve
(16) Engine coolant hose A
(17) Nipple (AT vehicles)
(18) Plug
(19) PCV valve(20) Purge control solenoid valve
(21) Nipple
(22) BPT
(23) BPT holder bracket
(24) Back pressure hose
(25) EGR vacuum hose A
(26) EGR vacuum pipe
(27) EGR vacuum hose C
(28) EGR valve
(29) Gasket
(30) EGR vacuum hose B
(31) EGR solenoid valve
(32) EGR pipe
(33) Pressure sensor
(34) Pressure sources switching sole-
noid valve
(35) Vacuum hose A
(36) Vacuum hose B
(37) Vacuum hose C(38) Bracket (Except Canada spec.
vehicles)
(39) Bracket (For Canada spec.
vehicles)
(40) Collar
(41) Intake manifold
Tightening torque: N´m (kg-m, ft-lb)
T1:
3.4±0.5 (0.35±0.05, 2.5±0.4)
T2:4.9±0.5 (0.5±0.05, 3.6±0.4)
T3:6.4±0.5 (0.65±0.05, 4.7±0.4)
T4:16±1.5 (1.6±0.15, 11.6±1.1)
T5:19±1.5 (1.9±0.15, 13.7±1.1)
T6:19±2 (1.9±0.2, 13.7±1.4)
T7:23±3 (2.3±0.3, 16.6±2.2)
T8:25±2 (2.5±0.2, 18.1±1.4)
T9:34±2 (3.5±0.2, 25.3±1.4)
7
[C1C0]2-7COMPONENT PARTS
1. Intake Manifold

2. Air Intake System
A: 2200 cc CALIFORNIA SPEC. VEHICLES
B2M2278A
(1) Gasket
(2) Throttle position sensor
(3) Gasket
(4) Idle air control solenoid valve(5) Intake manifold pressure sensor
(6) Throttle bodyTightening torque: N´m (kg-m, ft-lb)
T1:
2.2±0.2 (0.22±0.02, 1.6±0.1)
T2:6.0±0.8 (0.61±0.08, 4.4±0.6)
T3:22±2 (2.2±0.2, 15.9±1.4)
8
2-7[C2A0]COMPONENT PARTS
2. Air Intake System

B: 2200 cc EXCEPT CALIFORNIA SPEC. VEHICLES
B2M2279A
(1) Gasket
(2) Throttle position sensor
(3) Throttle body
(4) Idle air control solenoid valve
(5) Clamp
(6) Air intake duct(7) Air intake chamber
(8) Stay LH (MT vehicles)
(9) Stay LH (AT vehicles)
(10) Stay RH
(11) Spacer
(12) BushTightening torque: N´m (kg-m, ft-lb)
T1:
2.2±0.2 (0.22±0.02, 1.6±0.1)
T2:4.9±0.5 (0.5±0.05, 3.6±0.4)
T3:22±2 (2.2±0.2, 15.9±1.4)
9
[C2B0]2-7COMPONENT PARTS
2. Air Intake System

C: 2500 cc MODEL
B2M1732A
(1) Gasket
(2) Throttle position sensor
(3) Throttle body
(4) Clamp
(5) Air intake duct
(6) By-pass hose
(7) Air intake chamber(8) Stay A (AT vehicles)
(9) Stay B (AT vehicles)
(10) Stay C (MT vehicles)
(11) Stay D (MT vehicles)
(12) Spacer
(13) BushTightening torque: N´m (kg-m, ft-lb)
T1:
2.2±0.2 (0.22±0.02, 1.6±0.1)
T2:4.9±0.5 (0.5±0.05, 3.6±0.4)
T3:22±2 (2.2±0.2, 15.9±1.4)
10
2-7[C2C0]COMPONENT PARTS
2. Air Intake System

3. Air Cleaner
A: 2200 cc CALIFORNIA SPEC. VEHICLES
B2M2280A
(1) Spacer
(2) Bush
(3) Air chamber
(4) Cushion rubber
(5) Air intake duct A
(6) Air intake duct B
(7) Holder
(8) Air cleaner case A
(9) Clip(10) Air cleaner element
(11) Air cleaner case B
(12) Air cleaner case stay LH (MT
vehicles)
(13) Air cleaner case stay LH (AT
vehicles)
(14) Air cleaner case stay RH
(15) Clamp
(16) Intake air temperature sensor(17) Rubber holder
(18) Bush
(19) Spacer
Tightening torque: N´m (kg-m, ft-lb)
T1:
7.4±2.0 (0.75±0.2, 5.4±1.4)
T2:4.9±0.5 (0.5±0.05, 3.6±0.4)
11
[C3A0]2-7COMPONENT PARTS
3. Air Cleaner

B: 2200 cc EXCEPT CALIFORNIA SPEC. VEHICLES
B2M2281A
(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)
12
2-7[C3B0]COMPONENT PARTS
3. Air Cleaner