Subaru 2001 IMPREZA Manuale utente

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)

IGNITION IG(SOHC)

Page

1. General Description ....................................................................................2

2. Spark Plug...................................................................................................5

3. Ignition Coil and Ignitor Assembly...............................................................8

4. Spark Plug Cord........................................................................................10

IG(SOHC)-2

IGNITION GENERAL DESCRIPTION

1. General Description

A: SPECIFICATIONS

Item Designation

Ignition coil

and ignitor

assembly

Model 1600cc CM12—100C

2000cc FH0137

Manufacturer 1600cc HITACHI

2000cc DIAMOND

Primary coil resistance 1600cc 0.7 Ω±10%

2000cc 0.73 Ω±10%

Secondary coil resis-

tance 1600cc 13.0 kΩ±20%

2000cc 12.8 kΩ±15%

Insulation resistance between primary

terminal and case More than 10 MΩ

Spark plug Type and manufacturer 1600cc RC8YC4 .......... CHAMPION

Alternate BKR6E-11 .......... NGK

2000cc RC10YC4 .......... CHAMPION

Alternate BKR5E-11 .......... NGK

Thread size mm 14, P = 1.25

Spark gap mm (in) 1.0 —1.1 (0.039 —0.043)

IG(SOHC)-3

IGNITION

GENERAL DESCRIPTION

B: COMPONENT

1. 1600CC MODEL

S6M0329B

EN1039

(1)

(2)

(3)

(4)

(1) Spark plug (4) Spark plug cord (#2, #4) Tightening torque: N·m (kgf-m, ft-lb)

(2) Spark plug cord (#1, #3) T1: 6.4 (0.65, 4.7)

(3) Ignition coil and ignitor ASSY T2: 21 (2.1, 15.2)

IG(SOHC)-4

IGNITION GENERAL DESCRIPTION

2. 2000CC MODEL

C: 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.

S6M0329B

(1) Spark plug (4) Spark plug cord (#2, #4) Tightening torque: N·m (kgf-m, ft-lb)

(2) Spark plug cord (#1, #3) T1: 21 (2.1, 15)

(3) Ignition coil and ignitor ASSY T2: 6.4 (0.65, 4.7)

IG(SOHC)-5

IGNITION

SPARK PLUG

2. Spark Plug

A: REMOVAL

CAUTION:

All spark plugs installed on an engine, must be

of the same heat range.

1. RH SIDE

1) Disconnect battery ground cable.

2) Remove air intake duct. <Ref. to IN(SOHC)-8,

REMOVAL, Resonator Chamber.>

(1) Remove resonator chamber. <Ref. to IN

(SOHC)>

3) Remove spark plug cords by pulling boot, not

cord itself.

4) Remove spark plugs with the spark plug socket.

2. LH SIDE

1) Disconnect battery ground cable.

2) Disconnect washer motor connector.

3) Disconnect rear window glass washer hose from

washer motor, then plug connection with a suitable

cap.

4) Remove the two bolts which hold the washer

tank, then take the tank away from the working ar-

ea.

5) Remove spark plugs cord by pulling boot, not

cord itself.

Spark plug

1600cc CHAMPION: RC8YC4

NGK: BKR6E-11 (Alternate)

2000cc CHAMPION: RC10YC4

NGK: BKR5E-11 (Alternate)

G6M0095

B2M4127

B2M4286

G6M0095

B6M0562B

B2M2023

B2M4287

IG(SOHC)-6

IGNITION SPARK PLUG

6) Remove spark plug with the spark plugs socket.

B: INSTALLATION

1. RH SIDE

1) Install in the reverse order of removal.

Tightening torque (Spark plug):

20.6 N·m (2.10 kgf-m, 15.2 ft-lb)

CAUTION:

The above torque should be only applied to

new spark plugs without oil on their threads.

In case their threads are lubricated, the torque

should be reduced by approximately 1/3 of the

specified torque in order to avoid over-stress-

ing.

2. LH SIDE

1) Install in the reverse order of removal.

Tightening torque (Spark plug):

20.6 N·m (2.10 kgf-m, 15.2 ft-lb)

CAUTION:

The above torque should be only applied to

new spark plugs without oil on their threads.

In case their threads are lubricated, the torque

should be reduced by approximately 1/3 of the

specified torque in order to avoid over-stress-

ing.

C: INSPECTION

Check electrodes and inner and outer porcelain of

plugs, noting the type of deposits and the degree of

electrode erosion.

1) Normal

Brown to grayish-tan deposits and slight electrode

wear indicate correct spark plug heat range.

2) Carbon fouled

Dry fluffy carbon deposits on insulator and elec-

trode are mostly caused by slow speed driving in

city, weak ignition, too rich fuel mixture, dirty air

cleaner, etc.

It is advisable to replace with plugs having hotter

heat range.

B2M4288

(A) Electrode gap

(B) Carbon accumulation or wear

(D) Damage

(E) Damaged gasket

S6M0420A

G6M0087

G6M0088

IG(SOHC)-7

IGNITION

SPARK PLUG

3) Oil fouled

Wet black deposits show excessive oil entrance

into combustion chamber through worn rings and

pistons or excessive clearance between valve

guides and stems. If same condition remains after

repair, use a hotter plug.

4) Overheating

White or light gray insulator with black or gray

brown spots and bluish burnt electrodes indicate

engine overheating. Moreover, the appearance re-

sults from incorrect ignition timing, loose spark

plugs, wrong selection of fuel, hotter range plug,

etc. It is advisable to replace with plugs having

colder heat range.

D: CLEANING

Clean spark plugs in a sand blast type cleaner.

Avoid excessive blasting. Clean and remove car-

bon or oxide deposits, but do not wear away porce-

lain.

If deposits are too stubborn, replace plugs.

E: ADJUSTMENT

Correct it if the spark plug gap is measured with a

gap gauge, and it is necessary.

Spark plug gap: L

1.0 —1.1 mm (0.039 —0.043 in)

NOTE:

Replae with new spark plug if this area is worn to

“ball”shape.

G6M0089

G6M0090

S6M0412A

IG(SOHC)-8

IGNITION IGNITION COIL AND IGNITOR ASSEMBLY

3. Ignition Coil and Ignitor As-

sembly

A: REMOVAL

1) Disconnect battery ground cable.

2) Disconnect spark plug cords from ignition coil

and ignitor assembly.

•1600cc MODEL

•2000cc MODEL

3) Disconnect connector from ignition coil and igni-

tor assembly.

4) Remove ignition coil and ignitor assembly.

•1600cc MODEL

•2000cc MODEL

B: INSTALLATION

1) Install in the reverse order of removal.

Tightening torque:

6.4 N·m (0.65 kgf-m, 4.7 ft-lb)

CAUTION:

Be sure to connect wires to their proper posi-

tions. Failure to do so will damage unit.

•1600cc MODEL

•2000cc MODEL

G6M0095

EN1040

S6M0373

EN1044

B6M0930

EN1044

B6M0930

IG(SOHC)-9

IGNITION

IGNITION COIL AND IGNITOR ASSEMBLY

C: INSPECTION

Using accurate tester, inspect the following items,

and replace if defective.

1) Primary resistance

2) Secondary coil resistance

CAUTION:

If the resistance is extremely low, this indicates

the presence of a short-circuit.

Specified resistance:(1600cc)

[Primary side]

Between terminal No. 1 and No. 4

0.7

Ω

ΩΩ

Ω±

±±

10%

Between terminal No. 1 and No. 2

0.7

Ω

ΩΩ

Ω±

±±

10%

[Secondary side]

Between (A) and (B)

13.0 k

Ω

ΩΩ

Ω±

±±

20%

Between (C) and (D)

13.0 k

Ω

ΩΩ

Ω±

±±

20%

Specified resistance:

[Primary side]

Between terminal No. 1 and No. 2

0.73

Ω

ΩΩ

Ω±

±±

10%

Between terminal No. 2 and No. 4

0.73

Ω

ΩΩ

Ω±

±±

10%

[Secondary side]

Between (A) and (B)

12.8 k

Ω

ΩΩ

Ω±

±±

15%

Between (C) and (D)

12.8 k

Ω

ΩΩ

Ω±

±±

15%

3) Insulation between primary terminal and case:

10 MΩor more.

EN1041

1234

EN1042

(A) (B)

EN1041

1234

EN1043

(C)

(A)

(D)

(B)

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