JAC S2. Engine. Service Manual

Engine mounting System

Engine Mounting system 308

2. Circuit check

1). Turn off the ignition switch; unplug the harness connector at sensor end;

2). Open the ignition switch, use digital multimeter to

measure every terminals of sensor harness connector;

3). When you measure the power terminal of sensor,

please use 5V voltage as the standard. If the voltage

is different, that means there is fault in controlling

circuit or ECM, and you should do further test;

4). When you measure the grounding terminal of sensor,

it should be in breakover with battery negative pole.

If it is not, please check the grounding circuit.

5). If results of above checks are abnormal, please turn

off the ignition switch, plug out the ECM harness, and

check of the harness between sensor terminal and

ECM terminal is open or short-circuit.

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Engine mounting System

Engine Mounting system 309

(III)Assembly

1. Assemble the crankshaft positon sensor

1). Assemble the crankshaft positon sensor in the

mounting hole, and tighten the fixing bolts.

tightening torque 9~11N·m

2). Connect the harness connector
of crankshaft positon sensor.

2. Assemble the compressor assembly

3. Assemble the dynamo belt

4. Assemble the right front engine
cover

5. Connect the cable of battery
negative pole

6. Close the engine cover

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Engine mounting System

Engine Mounting system 310

VIII、Knock sensor

(I)Disassembly

1. Open the engine cover

2. Cut off the cable of battery negative pole. Please refer to Cut-off and Connection of Battery Cable.

3. Remove the air filter assembly. Please refer to air filter assembly.

4. Remove the electronic throttle valve. Please refer to Electronic Throttle Valve.

5. Remove the inlet manifold. Please refer to Inlet Manifold.

6. Disassemble the knock sensor

1). Cut off the harness connector of knock sensor.

2). Remove the fixing bolts of knock sensor
and take it out.

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(II)Check

1. Appearance check

1). Check if the fastening bolts are tightened according to

requirements, and if there is something on junction

surface of sensor and cylinder.

2. Circuit check

1). Turn off the ignition switch and unplug the harness

connector of knock sensor. Check if the circuit

between signal wire and ECM terminal is open or

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Engine mounting System

Engine Mounting system 311

short-circuit. If the result is abnormal, please do the

service.

3. Performance check

1). Cut off the harness connector of knock sensor; use

small hammer to tap the cylinder of knock sensor

accessory and at the same time, use millivolt of digital

multimeter to measure the voltage between signal

outputting end and grounding end of sensor. If there

is voltage generated when you tap the cylinder, that

means the sensor is in good condition, otherwaise,

you should change the sensor.

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Engine mounting System

Engine Mounting system 312

(III) Assembly

1. Assemble the knock sensor

1). Put the knock sensor in cylinder block.

2). Tighten the fixing bolts.

tightening torque

22.5±2.5N·m

3).Connect the harness
connector of knock sensor.

2. Assemble the inlet mainfold

3. Assemble the electronic throttle valve

4. Assemble air filter assembly

5. Connect the cable of battery negative pole

6. Close the engine cover

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Engine mounting System

Engine Mounting system 313

IX、 Pressure regulating valve

(I)Disassembly

1. Open the engine cover

2. Cut off the cable of battery negative pole. Please refer to Cut-off and Connection of Battery Cable.

3. Disassemble the pressure regulating valve

1). Cut off the harness connector of pressure regulating valve.

2). Remove the fixing
bolts of pressure
regulating valve.

3). Take out the
pressure regulating
valve.

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(II)Check

1. Check the pressure regulating valve

1). Use multimeter to measure the resistance between two terminals of pressure regulating valve, and the
resistance should be between 7 to 8Ω.
2). Electrify the pressure regulating valve terminal with

12V to see if there is the column-type slide valve in
pressure regulating valve slides smoothly.

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Engine mounting System

Engine Mounting system 314

(III)Assembly

1. Assemble the pressure regulating valve

1). Make sure that the new pressure regulating valve

seal ring is in good condition, and then smear a little

engine lubrication oil on it.

2). Assemble the pressure regulating valve and tighten the fixing bolts.

tightening torque 6±1N·m

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Engine mounting System

Engine Mounting system 316

X、 ECM controller

(I) Disassembly

1. Open the engine cover

2. Cut off the cable of battery negative pole. Please refer to Cut-off and Connection of Battery Cable.

3. Disassemble the ECM controller

1). Cut off the harness connector of the ECM controller.

2). Remove four fixing bolts of ECM controller and
take it out.

4. Disassemble the ECM controller bracket

1). Disassemble the three fixing bolts of ECM
controller bracket

2). Take out the ECM controller bracket.

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(II) Assembly

1. Assemble the ECM controller bracket

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Engine mounting System

Engine Mounting system 318

1). Assemble the ECM controller bracket on the vehicle body mounting hole and tighten the fixing bolts.

2. Assemble the ECM controller bracket

1). Mount the ECM controller on the bracket and

tighten the four fixing bolts of ECM controller.

2). Connect the harness connector of ECM controller.

3. Connect the cable of battery negative pole

4. Close the engine cover

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Engine mounting System

Engine Mounting system 318

XI、 Electronic accelerator pedal assembly

(I) Disassembly

1. Open the engine cover

2. Cut off the cable of battery negative pole. Please refer to Cut-off and Connection of Battery Cable.

3. Disassemble the electronic accelerator pedal

1). Cut off the harness connector of the electronic accelerator pedal.

2). Remove the three fixing bolts of
electronic accelerator pedal on vehicle body.

3). Take out the electronic accelerator pedal.

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(II) Check

1. Assemble the electronic accelerator pedal

1). Check if there is any crack on pedal and if the movement is flexible.

(III) Assembly

1. Assemble the electronic accelerator pedal assembly

1). Assemble the electronic accelerator pedal and tighten the fixing bolts.

tightening torque 7~11N·m

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Engine mounting System

Engine Mounting system 321

The Engine mounting system

I. Overview

(I) Structure overview

12 15

10 10

1. Rear mounting assy

2. Connection bracket of rear mounting

3. Left mounting assy

4. Connection bracket of left mounting

5. Right mounting assy

6. Hexagon flange blot

7. Hexagon flange blot

8. Hexagon flange blot

9. All metal hexagon
Flange locknut

10. Hexagon bolt and flat washer component

11. Hexagon flange blot

12.Hexagon flange blot

13. Hexagon flange blot

14. Hexagon flange blot

15.Hexagon flange blot

16.Hexagon flange blot

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Engine Mounting system 322

(II) Torque parameters

Key component torque table

Item

Torque(Nm)

Remark

The joint bolt and nut of rear

mounting and its connection bracket

M14

120~140

The fixed bolt of rear mounting

and subframe

M14

130~150

The connection bolt of rear

mounting bracket and transmission

M12

70~80

The connection bolt of left

mounting and vehicle body

M10

50~60

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JAC S2. Engine. Service Manual - part 22