JAC S2. Engine. Instruction — part 22
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 315
3). Connect the harness connector of pressure regulating valve.
2. Connect the cable
of battery negative
pole
3. Close the engine
cover
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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 317
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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 319
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Engine mounting System
Engine Mounting system 320
2). Connect the harness connector of electronic accelerator pedal.
2. Connect the cable of battery negative pole
3. Close the engine cover
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Engine mounting System
Engine Mounting system 321
The Engine mounting system
I. Overview
(I) Structure overview
10
10
12 15
15
10 10
12
10
5
7
1
14
13
8
2
9
11
3
11
4
6
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
Engine Mounting system 322
(II) Torque parameters
Key component torque table
SN
Item
Torque(Nm)
Remark
1
The joint bolt and nut of rear
mounting and its connection bracket
M14
120~140
2
The fixed bolt of rear mounting
and subframe
M14
130~150
3
The connection bolt of rear
mounting bracket and transmission
M12
70~80
4
The connection bolt of left
mounting and vehicle body
M10
50~60
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