JAC S2. Engine. Instruction — part 14
Engine ignition system
Engine ignition system 186
very important input signal and the ignition system is not able to work when the ECM fails to receive
this signal.
(III) Technical and service data
Service data
Ignition
wire
Primary coil
resistance
0.77 ~ 0.95Ω
Spark
Ignition
plug
clearance
0.7 ~ 0.8mm
(IV) Torque data
Important components torque table
Item
Torque (N·m)
Remarks
1 Ignition plug
25 ~ 30
M1
4
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Engine ignition system
Engine ignition system 187
II. Failure diagnosis
(I) Diagnosis analysis table
SN Failure
phenomenon
Failure causes analysis
Solution
Remarks
1
Engine can’t start
or start difficultly
Ignition coil or ignition
switch failure
Check or replace the ignition
coil or ignition switch
Ignition plug failure
Check or replace the ignition
plug
High voltage wire breaks off
or unconnected
Check the high voltage wire
2
Unstable idling
High voltage wire or
ignition plug failure
Check or replace the high
voltage wire or ignition plug
Ignition coil failure
Check or replace the ignition
coil
3
Engine in
viberation or lack
of power in
acceleration
High voltage wire failure
Check or replace the high
voltage wire
Ignition plug failure
Check or replace the ignition
plug
4
Poor fuel
economy
Ignition plug failure
Check or replace the ignition
plug
(II) Diagnosis procedures table
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Engine ignition system
Engine ignition system 188
Withou high voltage ignition, engine can’t start
The injector doesn’t work
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Engine ignition system
Engine ignition system 189
III. Ignition lock assy
(I) Disassembly
1. Open the engine hood
2. Disconnect the cathode wire of battery
3. Dismantle the driver’s airbag assy
4. Dismantle the steering wheel assy
5. Dismanlte the upper and down shell of steering column
6. Dismantle the clock spring
7. Dismantle the combination switch
8. Dismantle the anti-theft coil
9. Dismantle the ignition lock assy
1). Disconnect the wires connector of the ignition lock assy
2). Screw off the 2 nuts of
ignition switch assy
3). Take down the ignition
lock and its base
(II) Installation
1. Install the ignition lock assy
1). Screw into the 2 nuts of ignition lock and its
base tightly
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Engine ignition system
Engine ignition system 190
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Engine ignition system
Engine ignition system 191
2). Connect the wires connector of ignition lock assy.
2. Install anti-theft coil
3. Install combination switch
4. Install clock spring
5. Install the upper and down
shell of steering column
6. Install steering wheel assy
7. Install the driver’s airbag
8. Connect the cathode wires
of battery
9. Close the engine hood
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Engine ignition system
Engine ignition system 192
IV. Ignition coil
(I.) Disassembly
1. Open the enginie hood
2. Disconnect the cathode wires of battery
3. Dismantle the ignition coil
1). Disconnect the wires connector of ignition coil
2). Screw off the 4 fixed bolts of ignition coil
and the wires bracket in engine compartment
3). Take down the ignition coil
(II.) Check
1. Ignition coil
Check the primary coil resistance between terminals, the value shall be 0.77~0.95Ω
(III) Installation
1. Install ignition coil
1). Smear little insulation grease on the head of ignition coil and install ignition coil.
2). Screw the fixed bolts of the ignition coil tightly
Tighten torque: (8±2)N·
m
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Engine ignition system
Engine ignition system 193
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Engine ignition system
Engine ignition system 194
3). Connect the ignition coil wires connector
2. Connect the cathode wires of battery
3. Close the engine hood
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Engine ignition system
Engine ignition system 193
V. Ignition plug
(I) Disassembly
1. Open the engine hood
2. Disconnect the cathode wires of battery
3. Dismantle the ignition coil
4. Dismantle the ignition plug
1). Dismantle the ignition plug by the sleeve.
(II) Check
1. Check the ignition plug
a. Check if the thread or insulation body of the ignition plug has damage or rupture
b. Check if the ignition plug has carbod deposition or fuel/engine oil sediment. The normal
porcelain small head of ignition plug is between the white/slight yellow and gray or brown.
c. Check if the electrode of ignition plug has been damaged
d. Check the ignition plug clearance by the ruler. The standard value: 0.7~0.8mm.
e. Check the jump spark ability of ignition plug. Put the ignition plug on cylinder head and attach
the high voltage wires to the binding posts of the ignition plug, if it gives out the “pa-pa” sound
between the posts, it means the ignition plug works well and vice versa.
(III) Installation
1. Install ignition plug
1). Insert the ignition plug and tighten to the regulated torque by the special tool.
Tighten torque: 25~30Nm
2. Install the ignition coil
3. Connect the cathode wires of battery
4. Close the engine hood.
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Engine auxiliary exhausts system
Engine Mounting system 194
Engine auxiliary exhausts system
I. Overview
(I.) Structure overview
System diagram
Fuel evaporation and exhausts system
ฏܷ
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Engine auxiliary exhausts system
Engine Mounting system 195
Crankcase mandatory ventilation system
1
2
3
4
5
6
8
7
1. Air filter
2. Air inlet tube
3. Throttle valve body
4. Purification tank
5. PVC valve
6 Connection tube of PVC valve
7. Air inlet manifold
8. Injector
System description
Fuel evaporation and exhausts control system
The fuel steam recycling device is to recycle the gasoline steam inside the fuel tank and transfer
to air inlet tube of engine where mix with the fresh air and enter into cylinder for burning, by that
prevent gasoline steam from exhausting into air and causing pollution.
The fuel steam recycling device consists of the active carbon tank, solenoid valve of active
carbon tank, one-way valve and the relative steam tubes and vacuum tubes.
Crankcase mandatory ventilation system
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Engine auxiliary exhausts system
Engine Mounting system 196
The crankcase mandatory ventilation system is to send the cylinder blowby back to air inlet
manifold.
The carankcase mandatory ventilation valve (PCV) sends the cylinder blowby back to the air inlet
manifold. The air inlet manifold sucks into the crankcase blowby through PCV valve when the throttle
is partially opened. While the normal ventilator capacity of PCV valve is enough to suck in the blow
by and little ventilation air completely. The ventilation air is sucked into crankcase through air inlet
tube. During this process, the air comes through the connection tube of air inlet tube and rocker arm
cover. When the throttle is fully open, the vacuum degree of air inlet manifold is not enough for
opening PCV valve and sucking into crank blowby. The air will flow at a reverse direction through
connection tube. The PCV valve is not capable on the serious crank blowby cars because part air flows
into air inlet tube through connection tube under any circumstances.
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Engine auxiliary exhausts system
Engine Mounting system 197
(II) System theory
PCV valve working theory
Air inlet
manifold side without vacuum
S
2-w1179
A
ir inlet manifold side (High
vacuum)
Engine
Working conditions
Not
running
Engine working
conditions
Idling or decelaration
PCV valve
Not
workin
g
PCV valve
Fully open
Vacuum variation
Restri
cted
Slightly
Air inlet
manifold side
with suitable
vacuum
≊䰞ᇚ ࠙ם
Air inlet
manifold
side without
vacuum
≊䰞ᇚ ࠙ם
Engine
Working conditions
Normal
Engine working
conditions
Acceleration and high
speed poor performance
PCV valve
Normal
PCV valve
Work slowly
Vacuum variation
High
variation
Vacuum variation
Extremely high
variation
(III) Torque parameters
Key components torque table
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Engine auxiliary exhausts system
Engine Mounting system 198
SN
Item
Torque (N·m)
Remarks
1 M6×20 E10 bolt
8.4±0.6
M6×20 E10
2 M6×12 E10 bolt
8.4±0.6
M6×12 E10
3 M6×45 E10 bolt
8.4±0.6
M6×45 E10
4 M6×25 E10 bolt
8.4±0.6
M6×25 E10
5 M6×12 E8 bolt
8.4±0.6
M6×12 E8
6 Oxygen sensor
35±5
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Engine auxiliary exhausts system
Engine Mounting system 199
Standard parts torque
SN
Item
Torque (N·m)
Rem
arks
1
M6
9 ~ 11
2
M8
20 ~ 25
3
M1
0
30 ~ 50
4
M1
2
60 ~ 80
(IV) Service attention matters
Regular attention matters
1. Discharging engine coolant attention matters
1). after engine cooled down, then discharge the coolant.
2. Disconnect fuel tube attention matters
1). Before startring, make sure no flammable objects in the working area.
2). Release the fuel pressure before disconnection or disassembly.
3). Insert a plug in the front opening after disconnecting the joint.
3. Disconnection and disassembly attention matters
1). Work safely and follow the instructions and use the special tool according to the request.
2). Be careful with matching face and sliding face protection.
3). Use tape or something similar to seal the front opening of engine to prevent from impurities.
4). Lable and sort out the parts in order and category for the trouble shooting and re-assembly.
5). The principle for loosening bolts and nuts: Firstly loosen the one at the most outset then loosen
the one at its diagonal end and goes one in this sequence. If it has the designated loose sequence,
follow it.
4. Check, repair and replace attention matters
1). Check the part completely before repairing or replacing. Please change the part if necessary.
5. Assembly attention matters
1). Use the torque wrench to tighten nut and bolt.
2). The principle for tightening bolt and nut: Firstly tighten the central one by multi steps at the
same torque each time then tighten the ones at the inner and outer diagonal line. If it has
designated sequence for tightening, please follow it.
3). Replace with the new gasket, oil seal and O type ring.
4). Flush and clean and dry eack parts completely. Check if the engine oil or coolant tubes have
congestion.
5). Do not damage the matching face or sliding face. Clean the dust or scraps completely. Smear
the sliding face by engine oil before assembly.
6). Release the tube air firstly for re-charging engine coolant.
7).After repairing, running the engine and ratcheting up the RPM to check if the coolant, fuel,
engine oil and air inlet and outlet had leakage.
6. Parts needed to be tightened at a certain angle
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