1996 SUBARU LEGACY sensor

1. Engine Cooling System
Trouble Possible cause Corrective 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 engine coolant pump Replace.
f. Clogged engine coolant passage Clean.
g. Improper ignition timingInspect and repair ignition control 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.

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 hoses Repair or replace.
b. Leakage from engine coolant pump Replace.
c. Leakage from engine coolant pipe Repair or replace.
d. Leakage around cylinder head gasket Retighten cylinder head bolts or replace gasket.
e. Damaged or cracked cylinder head and crankcase Repair 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 engine coolant pump bearing Replace engine coolant pump.
d. Defective engine coolant pump mechanical seal Replace engine coolant pump.
20
2-5DIAGNOSTICS
1. Engine Cooling System

FUEL INJECTION SYSTEM2-7
Page
C COMPONENT PARTS....................................................................................2
1. Intake Manifold.........................................................................................2
2. Air Intake System.....................................................................................3
3. Air Cleaner ...............................................................................................4
W SERVICE PROCEDURE...............................................................................5
1. Air Cleaner and Air Intake Duct ...............................................................5
2. Mass Air Flow Sensor ..............................................................................6
3. Throttle Body............................................................................................7
4. Intake Manifold.........................................................................................8
5. Engine Coolant Temperature Sensor ....................................................18
6. Crankshaft Position Sensor ...................................................................18
7. Front Oxygen Sensor.............................................................................19
8. Rear Oxygen Sensor .............................................................................21
9. Throttle Position Sensor ........................................................................24
10. Camshaft Position Sensor .....................................................................25
11. Pressure Sensor (AT model)..................................................................25
12. Idle Air Control Solenoid Valve ..............................................................26
13. Pressure Sources Switching Solenoid Valve (AT model) ......................27
14. Fuel Injector ...........................................................................................28
15. Engine Control Module ..........................................................................28
16. Main Relay .............................................................................................30
17. Fuel Pump Relay ...................................................................................31

2. Air Intake System
B2M0152A

1Gasket


2Throttle position sensor


3Throttle body


4Clamp


5Air intake duct


6By-pass hose
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 2.2±0.2 (0.22±0.02, 1.6±0.1)
T2: 22±2 (2.2±0.2, 15.9±1.4)
3
2-7COMPONENT PARTS
2. Air Intake System

3. Air Cleaner
B2M0153A

1Mass air flow sensor bracket


2Mass air flow sensor ASSY


3Air cleaner upper cover


4Air cleaner element


5Spacer


6Bush


7Clip


8Air cleaner case


9Cushion rubber

10Air intake duct


11Resonator chamber ASSY


12Clip
Tightening 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)
4
2-7COMPONENT PARTS
3. Air Cleaner

B2M0154
1. Air Cleaner and Air Intake Duct
A: REMOVAL AND INSTALLATION
1) Loosen clamp which connect air intake duct to throttle
body and mass air flow sensor.
2) Disconnect blow-by hoses from air intake duct.
3) Remove air intake duct.
G2M0305
4) Disconnect connector from mass air flow sensor.
G2M0390
5) Remove clips of air cleaner upper cover.
6) Remove air cleaner element.
G2M0391
7) Remove air cleaner lower case.
8) Installation is in the reverse order of removal.
5
2-7SERVICE PROCEDURE
1. Air Cleaner and Air Intake Duct

B2M0154
2. Mass Air Flow Sensor
A: REMOVAL AND INSTALLATION
1) Remove air intake duct.
G2M0305
2) Disconnect connector from mass air flow sensor.
G2M0390
3) Remove air cleaner upper cover.
G2M0393
4) Remove mass air flow sensor from air cleaner upper
cover.
5) 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)
6
2-7SERVICE PROCEDURE
2. Mass Air Flow Sensor

B2M0154
3. Throttle Body
A: REMOVAL AND INSTALLATION
1) Remove air intake duct.
G2M0280
2) Disconnect accelerator cable
1.
3) Disconnect cruise control cable

2. (With cruise control
model)
B2M0155
4) Disconnect connector from throttle position sensor.
B2M0156
5) Disconnect engine coolant hoses from throttle body.
B2M0157
6) Remove bolts which install throttle body to intake mani-
fold.
7) Installation is in the reverse order of removal.
CAUTION:
Always use a new gasket.
Tightening torque:
22±2 N⋅m (2.2±0.2 kg-m, 15.9±1.4 ft-lb)
7
2-7SERVICE PROCEDURE
3. Throttle Body

B2M0154
4. Intake Manifold
A: REMOVAL
1) Release fuel pressure.
2) Disconnect connector from mass air flow sensor.
3) Remove air intake duct, air cleaner upper cover and air
cleaner element.
G2M0280
4) Disconnect accelerator cable
1.
5) Disconnect cruise control cable

2. (With cruise control
model)
B2M0334
6) Disconnect hoses from pressure sources switching
solenoid valve.
G2M0286
7) Remove power steering pump from bracket.
(1) Loosen lock bolt and slider bolt, and remove front
side V-belt.
B2M0340
(2) Remove pipe with bracket from intake manifold.
8
2-7SERVICE PROCEDURE
4. Intake Manifold