Chery SQR 7160 sedan. Manual — part 118

●Measuring Method

a ohmmeter method

Measure resistance with an ohmmeter, and determine if water temperature sensor operates

upon measured engine coolant temperature and below diagram. Remove coolant

temperature sensor, immerse into water and heat water. The sensor has different resistance

at corresponding temperature.

Water Temperature Sensor Resistance Specification

Temperature(℃)

Resistance(Ω)

Temp.(℃)

Resistance(Ω) Temp.(℃)

Resistance(

-40 100865

25

2795

90

241.8

-35 72437

30

2240

95

207.1

-30 52594

35

1806

100

178.0

-25 38583

40

1465

105

153.6

-20 28582

45

1195

110

133.1

-15 21317

50

980

115

115.7

-10 16120

55

809

120

100.9

-5 12261

60

671

125

88.3

0 9399

65

559

130

77.5

5 7263

70

469

135

68.3

10 5658

75

395

140

60.3

15 4441

80

334

145

53.4

20 3511

85

283

150

47.5

b voltmeter method

Install the sensor on the motor, and crank engine. Connect sensor signal lead to

voltmeter, there are different voltage drop at different temperature.

Oxygen sensor

Oxygen sensor is installed on exhaust pipe and accurately regulate excess air co-efficiency .

Oxygen sensor has 4 leads: C. voltage lead (pin A16) B. signal lead (pin B1)

A. signal ground (pin B23) D heater ground (pin B16)

PIN Function

C Sensor

voltage lead

B Sensor

signal

output

A Signal

ground

D Heater

ground

Oxygen sensor heater resistance impedance specification table

when temperature is 23℃, impedance is

13.2+/-10%

Resistance Heat Co-efficiency of

impedance

(23-800℃) (ppm/℃)

1150

When temperature is 800℃, impedance

is

25.0+/-10%

When temperature is -40℃, heater

impedance is

12.2+/-10%

●Detecting Method:

a、voltage signal method

Before testing oxygen sensor, engine must be under normal operation temperature.
【Note】Only digital voltmeter can be used to test oxygen sensor, otherwise oxygen sensor

will be damaged.


During testing, the insulation may be pricked. Before testing, digital voltmeter leads

must be connected to oxygen sensor ground lead and signal lead. When engine idles and

under normal temperature, if air/fuel ratio has some difference with ideal air/fuel ratio, the

oxygen sensor output voltage will vary from low to high periodically. The voltage

periodically varies from 0.3V to 0.8V. After testing, apply silicon seal gum on pricked

area.

A continuously high voltmeter reading indicates an rich air/fuel ratio polluted oxygen

sensor ambient temperature silicon seal gum or antifreeze agent polluted oxygen sensor or

leaded fuel used in engine.

A continuously low voltmeter reading indicates an poor air/fuel ratio, sensor fault. A

medium reading maintained indicates a possible oxygen sensor fault.


Remove oxygen sensor from engine. Connect a digital voltmeter lead to sensor, and

combust sensor sensitive element on propane welding torch flame. The propane flame could

isolate the sensitive element from oxygen, which will generate voltage. When sensitive

element is on flame, the voltage is approximately 1V, and when moved away the flame, the

voltage will drop to 0V. If sensor voltage does not change as specified, replace the oxygen

sensor.


◆Heating wire diagnostic

If the heater on sensor does not work, sensor pre-heating will be delayed, and computer

work time will also be prolonged. Then computer send a wrong rich air/fuel ratio signal,

wasting the fuel.

b、Ohmmeter method

Remove oxygen sensor and connect the ohmmeter between the heating wire and ground

wire. Referring to above diagram, if the resistance measured is not as specified, replace it

2.1.5 Speed sensor
◆ If speed sensor is damaged, the engine can not be started.

Speed sensor has 2 leads, one is signal lead (pin B7) and the other is ground wire (pin B6)


⑴ speed sensor
⑵ belt pulley with teetht
⑶ signal output

⑷ signal corresponding to 2

mis-teeth.

Speed sensor determines firing and fuel injection time by monitoring the teeth on the flying

wheel, engine speed and crankshaft position signal.


● Testing method

a ohmmeter method: the coil resistance is 515Ω,

b oscilloscope

method:

Use oscilloscope to monitor pulse waveform, and a voltage pulse will generate when a

tooth pass by. The flying wheel on this engine have 60-2 teeth.

2.1.6 Ignition

coil

Ignition Coil Electrical Specification

Primary coil induction

5.80±15%mH

Primary coil resistance

0.53±10%Ω

Secondary coil induction

12.8±10%kΩ

Secondary coil resistance

40.0±20%H

Testing voltage

2Vdc

Testing current

7.0Amps

Output (no load)

40kvMin

Output (50Pf load)

40.0±7%mJ

Energy storage time (reference)

6.3ms

Secondary peak value current

74mA±7%

I firing delayed time

3.6ms±3%

Coil number ratio

83:1


● Testing method

Ohmmeter method: referring to above chart and check ignition coil resistance.


Ignition wire

Remove ignition wire and 5-8mm away from cylinder. Turn on ignition switch, start engine

and watch flame. A strong blue flame indicates a operational ignition coil. Otherwise, check

ignition coil. Using ohmmeter method, referring to above chart, check and remove injector

connector before checking.


Monitoring each cylinder misfire

Remove each cylinder spark plug, and connect to appropriate high-tense wire, ensuring

spark plug thread reliably ground on cylinder body. Start engine and monitor spark plug

misfire.

2.1.7 Throttle position sensor (TPS)

TPS fault may cause unsmooth acceleration, engine stalling and rough idle etc. TPS has 3

leads, a current lead (Pin B22), a ground lead (Pin B23) and a signal lead (B17).
● Testing method

a ohmmeter

method:

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Политика конфиденциальности