Geely Emgrand X7. Manual part — 48

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

(b) Turn ignition switch to ON position.

(c) Press the fault diagnosis tester power button.

(d) Select the following menu items: Engine/Read DTC codes.

(e) Read DTC codes.

Results

DTC Codes Shown

To Step

DTC other than P0131, P0133, P0134

No

P0131. P0133. P0134

Yes

Step 8

Measure Pre-Sensor Signal Circuit

(a) Rotated ignition switch to OFF

position .

(b) Disconnect front oxygen sensor

harness connector EM04.

(c) Rotated ignition switch to ON

position .

(d) Measure the voltage value

between the front oxygen sensor
wiring harness connector EM04
terminal No.B and reliable
ground.

Standard Voltage: 0.35-0.5V

(e) Connect front oxygen sensor

harness connector EM04.

前氧传感器线束连接器

EM04

A

B

C

D

NL02-0040c

Is voltage the specified value?

Step 9

Measure pre-catalytic oxygen sensor ground circuit.

(a) Rotated ignition switch to OFF position.

(b) Disconnect front oxygen sensor harness connector EM04.

(c) Rotated ignition switch to ON position.

(d) Measure resistance between front oxygen sensor EM04 terminals A and a reliable ground.

Standard Resistance: Less than 1 Ω

No

Go to step 11

Yes

No

Refer to 2.12.7.14 DTC Chapter Index.

Yes

Front oxygen sensor harness

connectorEM04

191

(e) Connect front oxygen sensor harness connector EM04.

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.

(a) Rotated ignition switch to OFF

position .

(b) Disconnect front oxygen sensor

harness connector EM04.

(c)

Disconnect ECM harness
connector EM01.

(d) Measure resistance between front

oxygen sensor wiring harness
connector EM04 terminal B and
ECM harness connector terminal
No.47. Inspect whether the circuit
is open. Otherwise, repair the
faulty part.

ECM线束连接器

EM01

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

NL02-0033c

(e) Measure resistance between front oxygen sensor wiring harness connector EM04 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 EM04 terminal B

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

Test Items

Standard Value

Resistance Between EM04(B) and EM01 (47)

Less than 1 Ω

Resistance Between EM04 (B) and a Reliable Ground

10 kΩ or higher

Voltage Between EM04 (B) and a Reliable Ground

0V

Step 12

Inspect the front oxygen sensor ground circuit.

(a) Rotated ignition switch to OFF position .

(b) Disconnect front oxygen sensor harness connector EM04.

No

Go to step 12

Yes

Next

Go to step 15

Normal

Go to step 15

ECMharness connectorEM01

192

(c) Disconnect ECM harness connector EM01.

(d) Measure resistance between front oxygen sensor wiring harness connector EM04 terminal A

and ECM harness connector terminal No.73. Inspect whether the circuit is open. otherwise,
repair the faulty part.

(e) Measure resistance between front oxygen sensor wiring harness connector EM04 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 EM05 terminal A

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

Test Items

Standard Value

Resistance Between EM04 (A) and EM01 (73)

Less than 1 Ω

Resistance Between EM04 (A) and a Reliable Ground

10 kΩ or higher

Voltage Between EM04 (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 2.2.8.1 Replacement of Engine Control Module to Replace ECM.

(b) Carry out the crankshaft position sensor learning, refer to 2.2.7.11 “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.

No

Repair the faulty part.

Yes

Yes

193

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 2.2.7.3 Intermittent Fault
Inspection for intermittent fault.

Yes

194