JAC S2. Engine. Instruction — part 13

Engine ignition system

Engine ignition system 170

4). Connect the pump wires connector
Attention: Make sure the joint has beenconnected tightly by pulling the tube forcibly

5) Install the access cap of fuel tank

. Install the rear seat cushion assy
3. Connect the cathode wire of battery
4. Close the engine hood

Engine ignition system

Engine ignition system 171

IX. Fuel filter assy

(I) Disassembly

1. Open the engine hood
2. Disconnect the cathode wire of battery
3. Release the fuel system pressure
4. Dismantle the fuel filter assy

1) Disconnect the fuel return nylon
tube with the fuel filter.
Attention: Use the towel to wrap the
fuel filter to avoid the left fuel spill-
out.

2) Disconnect the fuel inlet nylon tube with the fuel filter

3). Screw off the fixed
bolts of fuel filter
4). Take out the filter after opening
the cover.

Engine ignition system

Engine ignition system 172

(II) Check

1. Check the fuel filter assy
1). Check if the filter surface has scratch or severe deformation.

Engine ignition system

Engine ignition system 173

(III) Installation

1. Install the fuel filter assy
1) Put the filter into the cover
Attention: Make sure the installation direction is correct; put the arrow toward the wider open end of
the cover.
2) Screw in the fixed bolts of the fuel filter.

3) Connect the filter with the fuel
inlet nylon tube

4). Connect the filter with fuel
return nylon tube

2. Connect the cathode wire of
battery
3. Close the engine hood

S2-

Engine ignition system

Engine ignition system 174

X. Feul filling tube assy

(I) Disassembly

1. Open the engine hood.
2. Disconnect the cathode wire of battery
3. Release the fuel system pressure
4. Dismantle the rear wheel cover
5. Dismantle the fuel filling tube assy
1) Disconnect the fuel filling tube with fuel tank.

2) Screw off the 2 mounting bolts of the fuel

filiing tube fender and detach the fender from

the vehicle body

3) Open the filling port cover and screw off the

fuel filling cap then screw off the 4 mounting

bolts for taking out the fuel filling tube.

Engine ignition system

Engine ignition system 175

(II) Check

1. Check the fuel filling tube assy
1) Check if the fender or tube has damage, if has, please replace it

(III) Installation

1. Install fuel filling tube assy
1). Screw in the 4 fixed bolts of fuel filling cap
Tighten torque: 4~6Nm.

2). Hoist the car
3). Screw in the 2 fixed bolts of the
fender.
Tighten torque: 8~12Nm.

4). Connect the fuel filling tube
with the tank and tighten the clamp

2. Install the rear wheel cover
3. Connect the cathode wire of battery
4. Close the engine hood

Engine ignition system

Engine ignition system 176

XI. Fuel tube assy

(I) Disassembly

1. Open the engine hood
2. Disconnect the cathode wire of battery
3. Dismantle the tubes fender
1). Pry up the dent to detach the fender from the bottom of vehicle then take the fender down.

4. Dismantle fuel tubes assy I
1). Disconnect the fuel tubes assy I from the carbon
tank.
2). Detch the fuel tubes assy I from the fixed buckle.

3). Disconnect the fuel tubes I with the fuel
evaporation nylon tube
4). Take down the fuel tubes assy I

Engine ignition system

Engine ignition system 177

5. Disassemble fuel tubes assy II

1). Disconnect the fuel tubes assy II with the fuel pressure guiding rail components

2). Disconnect the fuel tubes assy II with
the fuel return nylon tube assy
3). Take down the fuel tubes assy II.

6. Disassemble the fuel tubes assy III

1). Disconnect the fuel tubes assy III with
the carbon tank.

2). Disconnect the fuel tubes assy III with
the solenoid valve of carbon tank.
3). Take down the fuel tubes assy III.

Engine ignition system

Engine ignition system 178

Engine ignition system

Engine ignition system 179

(II) Installation

1. Install the fuel tubes assy III

1). Connect the fuel tubes assy III with the solenoid valbe of carbon tank.

2). Put the tubes on the fixed buckle then connect

the fuel tubes assy III with the carbon tank.

2. Install the fuel tubes assy II

1). Put in the fixed buckles and install to the
bottom of vehicle body.

2). Connect the fuel tubes assy II with the fuel
return nylon tube assy.

3). Connect the fuel tubes assy II with the fuel
pressure guiding rail components.

S2-w11

Engine ignition system

Engine ignition system 180

3. Install the fuel tubes assy I

1). Connect the fuel tubes assy I with the fuel evaporation nylon tube assy.

2). Put in the fixed buckles and installed to the
bottom of vehicle.
3). Connect the fuel tubes assy I with the carbon
tank.

4. Install the tubes fender

1). Install the fuel tubes assy on the fender
2). Install the fender to the bottom of vehicle.

5. Connect the cathode wire of battery
6. Close the engine hood

Engine ignition system

Engine ignition system 181

VII. Fuel pressure guiding rail components

(I) Disassembly

1. Open the engine hood
2. Disconnect the cathode wire
3. Release the fuel system pressure
4. Dismantle the air filter assy
5. Dismantle the fuel pressure guiding rail components

1). Disconnect the fuel inlet tube with the
guiding rail components

Attention: Hold pressing down the safety device

at the mouth of fuel inlet tube then pull
out the tube.

2). Disconnect the wires connector of the 4
injectors

Attention: Pull up the gray self-lock device and

hold it then it can disconnect the
connector.

3). Screw off the 2 compression bolts
4). Take down the guiding rail components.

Engine ignition system

Engine ignition system 182

(II). Check

1. Check the fuel pressure guiding rail components

1). Measure the magnetic coil resistance by DMM, the standard value: 11~16Ω.
2). Check if the injector has carbon deposition.

Engine ignition system

Engine ignition system 183

(III) Installation

1. Install the fuel pressure guiding rail components

1). Install the fuel pressure guiding rail components and tighten the bolts

Engine ignition system

Engine ignition system 184

2). Connect the wires connector of injector.

3). Connect the fuel inlet tube with the guiding rail components

2. Install the air filter assy
3. Connect the cathode wire of battery
4. Close the engine hood

Engine ignition system

Engine ignition system 185

Engine ignition system

I. Overview

(I) Structure overview

The ignition system consists of ignition switch, ECM and ignition coil, 3 components. The sensors

related with ignition control are included with crankshaft position sensor, air inlet temp& pressure

sensor, water temp sensor, throttle position sensor. The function of the ignition control system is to

control the ignition advance angle of engine through the ignition coil; this is also one of the major

functions of engine electric control system.

The ECM will calculate and choose the best suitable ignition angle for the current condition based

on the comprehensive signals like engine rotation speed, throttle openness, water temperature, air

inlet temperature& pressure and knocking received from the sensors so that to achieve the fuel

economy, power performance and low emission as well as to prevent from knocking. The close angle

refers to the rotation angle of crankshaft or camshaft during the switch-on period of the ignition coil.

For the inductive energy storage ignition system, the inductive voltage generated by the ignition coil

is determined by the current flew through coil at the instant moment that the primary coil switches

off, the bigger current, the bigger inductive voltage. Due to the inductive effect of coil, the current

flew through coil is with exponential increase under the consistent voltage of power since the switch-

on of primary coil and gradually goes to the saturation state. As the close-angle stays unchanged, the

switch-on time of primary coil decreases gradually with the increase of engine rotation speed. In

order to meet the requirement of ignition voltage and energy, ECM will control the close-angle

automatically according to the RPM of engine; it will increase the close-angle when the RPM goes

up to guarantee the enough switch-on time of primary coil for the close to saturation current and vice

versa.

(II) System theory

Ignition
switch
control

The engine rotation speed sensor is magnetic induction type. The signal plate attaches to the

flywheel, so when the engine is running, the senser emits the corresponding alternating signal that

is transmitted to ECM. Then ECM calculates the crank angle and determines the top dead center of

piston, which will directly affect the preciseness of ignition advance angle control. So this one is a