Geely Emgrand X7. Manual part — 45

2.2.7.20 DTC P0117 P0118

1. DTC

description:

DTC P0117 Temperature Sensor of Engine Coolant Circuit Voltage Too Low

DTC P0118

Temperature Sensor of Engine Coolant Circuit High Voltage or Open Circuit A

ECT sensor is a variable resistor with a negative temperature coefficient and used to measure the
temperature of engine coolant. ECM provides a 5V voltage through ECM harness connector
EM01 terminal No.49 to ECT sensor harness connector EM23 terminal No.3 and a low internal
reference voltage through EM01 terminal No.74 to ECT sensor connector EM23 terminal No.1.
ECM will always record the length of time the ignition switched off. When starting, if the ignition
switched off time reaches the pre-set time, the engine control module will compare the engine
coolant temperature and intake air temperature in order to determine whether the difference
between the two is in normal working range.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC

Detection

Strategy

Conditions For Setting The DTC
(Control Strategy)

Fault Locations

P0117

1. Idle

2. Coolant temperature sensor

circuit is short to ground.

3. Coolant temperature by default

changes as the running time
changes.

P0118

More Than the
Upper Limit

Lower Than the
Lower Limit

1. Idle

2. Coolant temperature sensor

signal circuit is open or short to
5V voltage.

3. Coolant temperature by default

changes as the running time
changes.

1. Sensor

Circuit

2. Sensor

3. ECM.

179

3. Circuit

sketch

发

动
机

控
制

模

块

冷却液
温度传感器

74

EM01 V5RTN1

CTS

1

49

EM01

3

NL02-0036c

4. Diagnostic

Steps:

Warning!

See Warnings Regarding Cooling System in Warnings and Cautions.

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.

Note: At any time do not use flammable antifreeze, such as alcohol. Combustible antifreeze can
cause serious fires.

Step 1

Initial Inspection

(a) Inspect the temperature sensor of engine coolant for whether there is evidence of corrosion,

as well as the engine coolant is leaking through the sensor.

(b) Inspect whether the engine coolant level in the reservoir of cooling system is correct.

Step 2

Measure resistance of temperature sensor of engine coolant.

Next

Coolanttemperature
sensor

Engi

ne

co

ntr

ol mo

dul

e

180

(a) Rotated ignition switch to OFF

position .

(b)

Disconnect the temperature
sensor of engine coolant harness
connector EM23.

(c) Measure the resistance of

temperature sensor of engine
coolant.

冷却液温度传感器线束连接器

EM23

1

2

3

NL02-0037c

Standard resistance value (for detailed parameters, see 2.2.1.2 Temperature-resistance
Relationship of Temperature Sensor): 20 (68

℃

°F) 3511±2.6%Ω

(d) Connect the temperature sensor of engine coolant harness connector EM23.

Is resistance the specified value?

Step 3

Measure temperature sensor of engine coolant signal circuit.

(a) Rotated ignition switch to OFF position .

(b) Disconnect the temperature sensor of engine coolant harness connector EM23.

(c) Rotated ignition switch to ON position .

(d) Measure voltage between temperature sensor of engine coolant EM23 terminal No.3 and a

reliable ground.

Standard Voltage: 4.7-5.5V

(e) Connect the temperature sensor of engine coolant harness connector EM23.

Is the voltage normal?

Step 4

Measure ground circuit of temperature sensor of engine coolant.

(a) Rotated ignition switch to OFF position .

(b) Disconnect the temperature sensor of engine coolant harness connector EM23.

(c) Rotated ignition switch to ON position .

(d) Measure resistance between temperature sensor of engine coolant harness connector EM23

terminal No.1 and reliable ground.

Standard Resistance: Less than 3 Ω

No

Go to step 5

Yes

No

Replace the temperature sensor of engine
coolant, go to step 9.

Yes

Coolanttemperature sensorharness

connectorEM23

181

(e) Connect the temperature sensor of engine coolant harness connector EM23.

Is the resistance normal?

Step 5

Inspect the temperature sensor of engine coolant signal circuit.

(a) Rotated ignition switch to OFF

position .

(b)

Disconnect the temperature
sensor of engine coolant harness
connector EM23.

(c)

Disconnect ECM harness
connector EM01.

(d) Measure resistance between

engine coolant temperature
sensor wire harness connector
EM23 terminal 3 and ECM wire
harness connector terminal 49.
Inspect whether there is
short-circuit situation.

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

GC02-1004c

(e) Measure resistance between engine coolant temperature sensor wire harness connector EM23

terminal 3 and reliable grounding. Inspect whether there is grounding short-circuit.

(f) Measure voltage between temperature sensor of engine coolant wiring harness connector

EM23 terminal No.3 and a reliable ground. Inspect whether the circuit is short to power
supply.

Test Items

Standard Value

Resistance Between EM23 (3) and EM01 (49)

Less than 1 Ω

Resistance Between EM23 (3) and a Reliable Ground

10 kΩ or higher

Voltage Between EM23 (3) and a Reliable Ground

0V

Step 6

Inspect the temperature sensor of engine coolant ground circuit.

(a) Rotated ignition switch to OFF position .

(b) Disconnect the temperature sensor of engine coolant harness connector EM23.

(c) Disconnect ECM harness connector EM01.

(d) Measure resistance between engine cooling temperature sensor wire harness connector EM23

terminal 1 and ECM wire harness connector terminal 74. Inspect whether there is
short-circuit situation, if yes, repair fault position.

(e) Measure voltage between temperature sensor of engine coolant harness connector EM23

No

Go to step 6

Yes

Go to step 7

Next

Go to step 7

ECMharness connectorEM01

182