Geely Emgrand X7. Manual part — 194

(a) Rotated ignition switch to OFF

position .

(b) Disconnect the rear oxygen

sensor harness connector EN03.

(c) Rotated ignition switch to ON

position .

(d) Measure resistance between rear

oxygen sensor EN03 terminal A
and a reliable ground.

Standard Resistance: Less than 1 Ω

(e) Connect the rear oxygen sensor

harness connector EN03.

NL02-2067b

A

B

C

D

EN03 后氧传感器线束连接器

A

Is resistance the specified value?

Step 10

Replace the rear oxygen sensor.

Step 11

Inspect the rear oxygen sensor signal circuit.

(a) Rotated ignition switch to OFF

position .

(b) Disconnect the rear oxygen

sensor harness connector EN03.

(c)

Disconnect ECM harness
connector EN01.

(d) Measure resistance between rear

oxygen sensor wiring harness
connector EN03 terminal B and
ECM harness connector terminal
No.48. Inspect whether the
circuit is open. otherwise, repair
the faulty part.

NL02-2066b

A

B

C

D

EN03 后氧传感器线束连接器

B

Next

Go to step 15

No

Go to step 12

Yes

EN03 rear oxygen sensor harness connector

EN03 rear oxygen sensor harness connector

775

(e) Measure resistance between rear

oxygen sensor harness connector
EN03 terminal No.B and a
reliable ground. Inspect whether
the circuit is short to ground. If
there is no short circuit, repair the
faulty part.

(f) Measure voltage between rear

oxygen sensor harness connector
EN03 terminal No.B and a
reliable ground. Inspect whether
the circuit is short to power
supply. If there is no short circuit,
repair the faulty part.

NL02-2068b

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

48

Test Items

Standard Value

EN03(B)-EN01(48) Resistance value

Less than 1 Ω

Resistance Between EN03 (b) and a Reliable
Ground

10kΩ 或更高

Voltage Between EN03 (b) and a Reliable Ground

0V

Step 12

Inspect rear oxygen sensor ground circuit

(a) Rotated ignition switch to OFF

position .

(b) Disconnect the rear oxygen

sensor harness connector EN03.

(c)

Disconnect ECM harness
connector EN01.

(d) Measure resistance between rear

oxygen sensor wiring harness
connector EN03 terminal A and
ECM harness connector terminal
No.73. Inspect whether the
circuit is open. otherwise, repair
the faulty part.

NL02-2067b

A

B

C

D

EN03 后氧传感器线束连接器

A

Normal

Go to step 13

EN01 engine control module harness

connector

EN03 rear oxygen sensor harness connector

776

(e) Measure resistance between rear

oxygen sensor harness connector
EN03 terminal No.A and a
reliable ground. Inspect whether
the circuit is short to ground. If
there is no short circuit, repair the
faulty part.

(f) Measure voltage between rear

oxygen sensor harness connector
EN03 terminal No.A and a
reliable ground. Inspect whether
the circuit is short to power
supply. If there is no short circuit,
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

EN03(A)-EN01(73)Resistance value

Less than 1 Ω

Resistance Between EN03 (a) and a Reliable Ground

10kΩ 或更高

Voltage Between EN03 (a) and a Reliable Ground

0V

Execute next step as per normal.

Step 13

Inspect the ECM Power Supply Circuits.

(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 .

No

Repair the faulty part.

Yes

Next

Next

EN01 engine control module harness

connector

777

(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 Rear Oxygen Sensor” to replace the rear oxygen sensor.

No

Repair the faulty part.

Yes

778