Geely FC. Manual part - 3

Geely FC. Manual part - 3

Engine control system·- EFI system

Inspection

1. VVT control solenoid valve assembly (4G18-1006200)

(a) Resistance inspection

(1) Measure the resistance between terminals with ohmmeter

Resistance:

(b) Operation inspection

Connect battery positive (+) wire to No.1 terminal and negative (-) wire to No. 2 terminal, and check

valve operation.

Note: ensure that the valve is not stuck.

Hint: if there are foreign matters in the valve, the valve could not be closed tightly and will

thus result in slight pressure being lifted toward higher direction.

2. Throttle body components (4G18-1001240)

(a) Inspection of throttle body

(1) Throttle valve shaft should not swing.

(2) All channels should not be blocked.

(3) Throttle valve plate should rotate flexibly and act smoothly.

(4) When the throttle is at closed position, there should be no clearance between throttle stop bolts and

throttle lever.

Note: it is not allowed to adjust the throttle stop bolts.

3. Throttle position sensor (4G18-3600080)

(a) Resistance inspection

(1) Remove the wiring harness connectors of throttle posi-

tion sensor.

(2) Measure the resistance between 1

#

pin and 2

#

pin with

ohmmeter, resistance value:

.

(3) Connect 2 terminals respectively to 1

#

pin and 3

#

pin,

and turn the throttle, the resistance value varies linearly

with the opening of throttle, but 2

#

pin

and 3

#

pin are

contrary to this.

Note: pay attention whether there is great jump with

resistance value when observing resistance change.

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5. Water temperature sensor (4G18-3600040)

This sensor applies sealing NTC thermal resistor in temperature sensor, and resistance value varies with

ambient temperature, thus slight change of outside temperature could be measured.

Measuring its out-

put resistance could reflect the temperature of contact media. Signals from A and C are sent to ECU,

and Signals from B and earth are sent to instrument.

Operating principle (Fig. 1):

Note:

A, B and C represent 3 pins of sensor, and see pin root for the mark.

Measuring method:

(Removing the joint) place digital universal meter at ohm gear,

and connect 2 terminals respectively to 1# pin and 2# pin, and

the resistance under normal temperature should be more than

1M

. Place digital universal meter at millivolt gear, and knock

around knock sensor with a hand hammer, there should be voltage

signal output at the moment.

Engine control system·- EFI system

Fig. 1

1 Vibration block

2 Housing

3 Piezoelectric ce-

ramics

4 Contact

5 Electric connec-

tion

4. Knock sensor (4G18-3600020)

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Characteristic curve of intake air

temperature sensor NTC resistor

Characteristic curve of

temperature sensor

Stepping motor of idle speed actuator

6. Intake air temperature sensor (4G18-3600090)

Intake air temperature sensor is a resistor with negative tem-

perature coefficient (NTC), resistance varies with intake air

temperature, and this sensor sends a voltage indicating change

of intake air temperature to controller.

Simple measuring method:

(Removing the joint) place digital universal meter at ohm gear,

and connect 2 terminals respectively to 1

#

pin and 2

#

pin of

sensor, and rated resistance at

5%, and

other corresponding resistance values could be measured ac-

cording to the characteristic curve in above drawing. Analog

method could also be applied in measurement. Use an elec-

tric blower to blow air into the sensor (pay attention not to

keep them too near), and observe the change of resistance,

which should decrease at the moment.

7. Stepping motor (4G18-3600070)

Schematic diagram and pins

Engine control system·- EFI system

Use digital universal meter to measure:

Resistance-temperature characteristics of temperature sensor

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Temperature range(

Resistance at A and C

Resistance at B

Pins: Pin A is connected to ECU No. 65 pin

Pin B is connected to ECU No. 66 pin

Pin C is connected to ECU No. 67 pin

Pin D is connected to ECU No. 64 pin

Maintenance precautions:

1. It is not allowed to apply any force at axial direction with the purpose of pressing into or pulling out the

axle;

2. Before idle speed regulator with stepping motor is mounted into throttle body, its shaft must be at fully

retractive position;

3. Pay attention to clean and maintain bypass air passage frequently;

4. After removing battery or ECU, pay attention to self-teach stepping motor in time.

Self-teach method of M7 system:

turn on ignition switch but not start engine immediately, and start it

after 5 seconds.

If engine idle speed is found bad at the moment, it is

necessary to repeat the above steps.

Simple measuring method: (removing the joint) place digital universal meter at ohm gear, and connect

2 terminals respectively to Ad pin and BC pin of regulator, and rated resis-

tance at

Engine control system·- EFI system

Electrical
wiring
diagram
on step-
ping motor
of idle
speed
actuator

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