Subaru 2001 IMPREZA User manual

FUJI HEAVY INDUSTRIES LTD. G1830GE2
2001 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX
ENGINE 1 SECTION
This service manual has been prepared
to provide SUBARU service personnel
with the necessary information and data
for the correct maintenance and repair
of SUBARU vehicles.
This manual includes the procedures
for maintenance, disassembling, reas-
sembling, inspection and adjustment of
components and diagnostics for guid-
ance of experienced mechanics.
Please peruse and utilize this manual
fully to ensure complete repair work for
satisfying our customers by keeping
their vehicle in optimum condition.
When replacement of parts during
repair work is needed, be sure to use
SUBARU genuine parts.
All information, illustration and specifi-
cations contained in this manual are
based on the latest product information
available at the time of publication
approval.
FUEL INJECTION (FUEL SYSTEMS) FU(SOHC)
EMISSION CONTROL
(AUX. EMISSION CONTROL DEVICES) EC(SOHC)
INTAKE (INDUCTION) IN(SOHC)
MECHANICAL ME(SOHC)
EXHAUST EX(SOHC)
COOLING CO
LUBRICATION LU
SPEED CONTROL SYSTEMS SP
IGNITION IG(SOHC)
STARTING/CHARGING SYSTEMS SC
ENGINE (DIAGNOSTICS) EN(SOHC)

EMISSION CONTROL
(AUX. EMISSION CONTROL DEVICES)
EC(SOHC)
Page
1. General Description ....................................................................................2
2. Front Catalytic Converter............................................................................3
3. Rear Catalytic Converter.............................................................................6
4. Canister.......................................................................................................7
5. Purge Control Solenoid Valve.....................................................................8
6. Two-way Valve............................................................................................9

EC(SOHC)-2
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)
GENERAL DESCRIPTION
1. General Description
A: CAUTION
•Wear working clothing, including a cap, protec-
tive goggles, and protective shoes during opera-
tion.
•Remove contamination including dirt and corro-
sion before removal, installation or disassembly.
•Keep the disassembled parts in order and pro-
tect them from dust or dirt.
•Before removal, installation or disassembly, be
sure to clarify the failure. Avoid unnecessary re-
moval, installation, disassembly, and replacement.
•Be careful not to burn your hands, because each
part on the vehicle is hot after running.
•Be sure to tighten fasteners including bolts and
nuts to the specified torque.
•Place shop jacks or safety stands at the specified
points.
•Before disconnecting electrical connectors of
sensors or units, be sure to disconnect negative
terminal from battery.

EC(SOHC)-3
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)
FRONT CATALYTIC CONVERTER
2. Front Catalytic Converter
A: REMOVAL
1) Set the vehicle on the lift.
2) Disconnect battery ground cable.
3) Disconnect front oxygen (A/F) sensor connector.
4) Disconnect connector from rear oxygen sensor
connector.
5) Lift-up the vehicle.
6) Remove under cover.
7) Separate center exhaust pipe from rear exhaust
pipe.
CAUTION:
Be careful, exhaust pipe is hot.
8) Remove bolts which hold front exhaust pipe onto
cylinder heads.
9) Remove front exhaust pipe and center exhaust
pipe from hanger bracket.
CAUTION:
Be careful not to pull down front exhaust pipe
and center exhaust pipe.
G6M0095
B2M4243
B2M4244
B2M3109
B2M3200
B2M3111

EC(SOHC)-4
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)
FRONT CATALYTIC CONVERTER
10) Separate front catalytic converter from front ex-
haust pipe.
NOTE:
The rear catalytic converter is integrated with front
catalytic converter. Therefore, the procedure for re-
moving rear catalytic converter is the same as the
description above.
B: INSTALLATION
CAUTION:
Replace gaskets with new ones.
1) Install front catalytic converter to front exhaust
pipe.
Tightening torque:
30 N·m (3.1 kgf-m, 22.4 ft-lb)
2) Install front exhaust pipe and center exhaust
pipe. And temporarily tighten bolt which installs
center exhaust pipe to hanger bracket.
3) Tighten bolts which hold front exhaust pipe onto
cylinder heads.
Tightening torque:
30 N·m (3.1 kgf-m, 22.4 ft-lb)
4) Install center exhaust pipe to rear exhaust pipe.
Tightening torque:
18 N·m (1.8 kgf-m, 13.0 ft-lb)
5) Tighten bolt which holds center exhaust pipe to
hanger bracket.
Tightening torque:
35 N·m (3.6 kgf-m, 26.0 ft-lb)
6) Install under cover.
S2M0923
S2M0923
B2M3111
B2M3200
B2M3109
B2M3111

EC(SOHC)-5
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)
FRONT CATALYTIC CONVERTER
7) Lower the vehicle.
8) Connect front oxygen (A/F) sensor connector.
9) Connect connector to rear oxygen sensor con-
nector.
10) Connect battery ground cable.
NOTE:
The rear catalytic converter is integrated with front
catalytic converter. Therefore, the procedure for in-
stalling rear catalytic converter is the same as the
description above.
C: INSPECTION
1) Make sure there are no exhaust leaks from con-
nections and welds.
2) Make sure there are no holes or rusting.
B2M4243
B2M4244
G6M0095

EC(SOHC)-6
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)
REAR CATALYTIC CONVERTER
3. Rear Catalytic Converter
A: REMOVAL
The front and rear catalytic converter and center
exhaust pipe are integrated into one unit. There-
fore, the removal and installation procedures are
the same as the those for the front catalytic con-
verter. <Ref. to EC(SOHC)-3, REMOVAL, Front
Catalytic Converter.>
B: INSTALLATION
The front and rear catalytic converter and center
exhaust pipe are integrated into one unit. There-
fore, the removal and installation procedures are
the same as the ones described under front catalyt-
ic converter. <Ref. to EC(SOHC)-4, INSTALLA-
TION, Front Catalytic Converter.>
C: INSPECTION
1) Make sure there are no exhaust leaks from con-
nections and welds.
2) Make sure there are no holes or rusting.
(A) Front catalytic converter
(B) Rear catalytic converter
(A) Front catalytic converter
(B) Rear catalytic converter
B2M4164A
B2M4164A

EC(SOHC)-7
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)
CANISTER
4. Canister
A: REMOVAL
1) Lift-up the vehicle.
2) Loosen two clamps which hold two canister hos-
es, and disconnect evaporation hose from canister.
3) Remove canister from body.
B: INSTALLATION
1) Install in the reverse order of removal.
Tightening torque:
23 N·m (2.3 kgf-m, 17 ft-lb)
C: INSPECTION
Make sure the canister and canister hoses are not
cracked or loose.
EN0898
B2M4166
B2M4166

EC(SOHC)-8
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)
PURGE CONTROL SOLENOID VALVE
5. Purge Control Solenoid Valve
A: REMOVAL
1) Disconnect battery ground cable.
2) Remove bolt which installs purge control sole-
noid valve onto intake manifold.
3) Take out purge control solenoid valve through
the bottom of the intake manifold.
4) Disconnect connector and hoses from purge
control solenoid valve.
B: INSTALLATION
1) Install in the reverse order of removal.
Tightening torque:
16 N·m (1.6 kgf-m, 11.6 ft-lb)
CAUTION:
Carefully connect the evaporation hoses.
C: INSPECTION
Make sure hoses are not cracked or loose.
G6M0095
H2M2985
H2M2986
H2M2985
B2M1893A

EC(SOHC)-9
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)
TWO-WAY VALVE
6. Two-way Valve
A: REMOVAL
1) Lift-up the vehicle.
2) Remove canister from body. <Ref. to EC(SO-
HC)-7, REMOVAL, Canister.>
3) Remove two-way valve with bracket as a single
unit from body.
4) Remove two-way valve from bracket.
B: INSTALLTION
1) Install in the reverse order of removal.
C: INSPECTION
1) Make sure that hoses are not cracked or loose.
EN0901