Geely Emgrand X7. Manual part — 191

Is voltage the specified value?

Step 9

Measure pre-catalytic oxygen sensor ground circuit.

(a) Rotated ignition switch to OFF

position .

(b) Disconnect the front oxygen

sensor harness connector EN02.

(c) Rotated ignition switch to ON

position .

(d) Measure resistance between front

oxygen sensor EN02 terminal A
and a reliable ground.

Standard Resistance: Less than 1 Ω

(e) Connect the front oxygen sensor

harness connector EN02.

NL02-2059b

A

B

C

D

EN02 前氧传感器线束连接器

A

Is resistance the specified value?

Step 10

Refer to 2.4.6.2 “Replacement of Front Oxygen Sensor” to replace the front oxygen
sensor

Step 11

Inspect the front oxygen sensor signal circuit.

No

Go to step 12

Yes

No

Go to step 11

Yes

Next

Go to step 15

EN02 front oxygen sensor harness

connector

763

(a) Rotated ignition switch to OFF

position .

(b) Disconnect the front oxygen

sensor harness connector EN02.

(c)

Disconnect ECM harness
connector EN01.

(d) Measure resistance between front

oxygen sensor wiring harness
connector EN02 terminal B and
ECM harness connector terminal
No.47. Inspect whether the
circuit is open. Otherwise, repair
the faulty part.

NL02-2058b

A

B

C

D

EN02 前氧传感器线束连接器

B

(e) Measure resistance between front oxygen sensor wiring harness connector EN02 terminal B

and a reliable ground. Inspect whether the circuit is short to ground. otherwise, repair the
faulty part.

(f) Measure voltage between front oxygen sensor wiring harness connector EN02 terminal B and

a reliable ground. Inspect whether the circuit is short to power supply. Otherwise, repair the
faulty part.

NL02-2060b

EN01 发动机控制模块线束连接器

1

2

4

5

3

81

63

44

25

6

62

43

24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

9

8

7

26

42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27

45

46

61 60 59 58

57 56 55

54 53 52 51 50 49 48 47

64

65

66

80 79 78 77 76 75 74 73 72 71 70 69 68 67

47

Test Items

Standard Value

EN02(B)-EN01(47)Resistance value

Less than 1 Ω

EN02(B)-reliable grounding resistance value

10 kΩ or higher

EN02(B)-Reliable grounding voltage value

0V

Step 12

Inspect the front oxygen sensor ground circuit.

Normal

Go to step 15

EN02 front oxygen sensor harness

connector

EN01Engine control module harness

connector

764

(a) Rotated ignition switch to OFF

position .

(b) Disconnect the front oxygen

sensor harness connector EN02.

(c)

Disconnect ECM harness
connector EN01.

(d) Measure resistance between front

oxygen sensor wiring harness
connector EN02 terminal A and
ECM harness connector terminal
No.73. Inspect whether the
circuit is open. otherwise, repair
the faulty part.

NL02-2059b

A

B

C

D

EN02 前氧传感器线束连接器

A

(e) Measure resistance between front oxygen sensor wiring harness connector EN02 terminal A

and a reliable ground. Inspect whether the circuit is short to ground. otherwise, repair the
faulty part.

(f) Measure voltage between front oxygen sensor wiring harness connector EN05 terminal A and

a reliable ground. Inspect whether the circuit is short to power supply. otherwise, repair the
faulty part.

NL02-2061b

EN01 发动机控制模块线束连接器

1

2

4

5

3

81

63

44

25

6

62

43

24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

9

8

7

26

42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27

45

46

61 60 59 58

57 56 55

54 53 52 51 50 49 48 47

64

65

66

80 79 78 77 76 75 74 73 72 71 70 69 68 67

73

Test Items

Standard Value

EN02(A)-EN01(73)Resistance value

Less than 1 Ω

EN02(A)-reliable grounding resistance value

10 kΩ or higher

EN02(A)-Reliable grounding voltage value

0V

Execute next step as per normal.

Step 13

Inspect the ECM Power Supply Circuits.

Yes

EN02Front oxygen sensor harness

connector

EN01Engine control module harness

connector

765

(a) Inspect whether ECM power supply circuit is normal.

(b) Inspect whether ECM ground circuit is normal.

Step 14

Replace ECM

(a) Refer to 2.12.8.1 Replacement of Engine Control Module to Replace ECM.

(b) Carry out the crankshaft position sensor learning, refer to 2.12.7.11 “Crankshaft Position

Sensor (CKP) Learning.

Step 15

Use fault diagnosis tester to confirm if DTC is stored again .

(a) Connect the fault diagnosis tester to the diagnostic interface.

(b) Turn ignition switch to ON position.

(c) Clear DTC code.

(d) Start and run the engine at idle speed to warm up the engine for at least 5 min.

(e) test the vehicle on the road for at least 10 min.

(f) Read control system DTC code again to confirm that the system has no DTC code.

Step 16

Troubleshooting

5. Maintenance

guide

:

Refer to 2.4.6.1 “Replacement of Front Oxygen Sensor” to replace the front oxygen sensor

No

Refer to 2.12.7.3 Intermittent Fault
Inspection for intermittent fault.

Yes

No

Repair the faulty part.

Yes

766