Geely Emgrand X7. Manual part — 51

(a) Rotated ignition switch to OFF

position .

(b) Disconnect the rear oxygen

sensor wiring harness connector
EM03.

(c)

Disconnect ECM harness
connector EM01.

(d) Measure resistance between rear

oxygen sensor wiring harness
connector EM03 terminal B and
ECM harness connector terminal
No.48. 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 rear oxygen sensor harness connector EM03 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 EM03 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.

Test Items

Standard Value

Resistance Between EM03(B) and EM01 (48)

Less than 1 Ω

Resistance Between EM03 (B) and a Reliable Ground

10 kΩ or higher

Voltage Between EM03 (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 wiring harness connector EM03.

(c) Disconnect ECM harness connector EM01.

(d) Measure resistance between rear oxygen sensor wiring harness connector EM03 terminal A

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

(e) Measure resistance between rear oxygen sensor harness connector EM03 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 EM03 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.

Test Items

Standard Value

Resistance Between EM03 (A) and EM01 (73)

Less than 1 Ω

Normal

Go to step 13

ECMharness connectorEM01

203

Resistance Between EM03 (A) and a Reliable Ground

10 kΩ or higher

Voltage Between EM03 (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.

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

Next

No

Repair the faulty part.

Yes

Next

204

2.2.7.25 DTC P0141

1. DTC

description:

DTC P0141

Rear Oxygen Sensor Heater Inoperation

The post-catalytic heated oxygen sensor (HO2S) is used for monitoring three-way catalytic
converter working status. The sensor compares the oxygen content in ambient air and oxygen
content in the exhaust flow. Each heated oxygen sensor has an internal heating element for sensor
heating. ECM controls the heated oxygen sensor heating control circuit. This makes the system
enter into the closed-loop control mode earlier, so that ECM can calculate Air-fuel ratio earlier.
ECM controls the heating control circuit switched on or off, so that heated type oxygen sensor
working temperature maintains in the specified range. Engine control module detects the
temperature by Measure the heater current.

The rear oxygen sensor heating coil voltage is provided by The Main Relay controlled by ECM.
When the ignition switch is turned to ON, Post-Catalytic oxygen sensor connector EM03 terminal
D will have battery voltage. ECM controls the heater working hours by ECM harness connector
EM01 terminal No.23.

2. Conditions for Setting DTC and the Fault Location:

DTC Code

DTC Detection
Strategy

Conditions For Setting The
DTC (Control Strategy)

Fault Locations

P0135

Hardware Circuit
Inspection

1. Engine Running Longer

than 60 s.

2. At idle Running Condition.

3. Pre-Catalytic

Oxygen

Sensor Heating

4. Pre-Catalytic

Oxygen

Sensor Heating Control
Terminal Disconnected.

5. Duration

Less

Than

20s.

1. Sensor

Circuit

2. Sensor

3. ECM.

3. Circuit

sketch

Refer to2.2.7.24 DTC P0137 P0138 P0140.

4. Diagnostic

Steps:

Note: Before carrying out this diagnosis step, observe the data list on fault diagnosis tester and
analyze the accuracy of the data, as these will help with quick diagnosis.

Step 1

Initial Inspection

Inspect the existence of following factors that will affect the heated type oxygen sensor working
status:

(a) Exhaust system leakage or blockage.

(b) Water enters into the heated oxygen sensor connector.

(c) After engine working in high temperature, whether exhaust pipes are too hot or not.

Step 2

Inspect the rear oxygen sensor heater resistance.

Next

205

(a) Rotated ignition switch to OFF position.

(b) Disconnect the rear oxygen sensor wiring harness connector.

(c) Measure the rear oxygen sensor heater resistance.

Standard Resistance

Connectors C and D, 8.1-11.1 Ω @ 20°C(68 °F)

(d) Connect the rear oxygen sensor wiring harness connector.

Is resistance the specified value?

Step 3

Inspect the terminal No.D to ground voltage.

(a) Rotated ignition switch to OFF

position.

(b) Disconnect the rear oxygen

sensor wiring harness connector.

(c) Rotated ignition switches to ON

position.

(d)

Measure voltage between
Post-Catalytic oxygen sensor
harness connector EM03 terminal
D and ground.

Standard Voltage: 11-14V

(e) Connect the rear oxygen sensor

wiring harness connector EM03.

Is voltage the specified value?

后氧传感器线束连接器

EM03

A

B

C

D

NL02-0041c

Step 4

Inspect the rear oxygen sensor heater control terminal continuity.

No

The rear oxygen sensor heater power supply circuit
malfunction.

Yes

No

Replace the rear oxygen sensor. Refer to 2.4.7.1
Replacement of Rear Oxygen Sensor.

Yes

Rear oxygen sensor harness

connectorEM03

206