Geely Emgrand X7. Manual part — 186

2.12.7.19 DTC P0112、P0113

1. DTC

description:

DTC P0112 Intake Air Temperature Sensor Circuit Low Voltage

DTC P0113

Intake Air Temperature Sensor Circuit High Voltage or Open Circuit

Intake air temperature pressure sensor has a signal circuit and an ECM internal ground circuit.
Intake air temperature pressure sensor is used to measure the air temperature entering the engine.
ECM provides 5 V reference voltage through ECM harness connector EN01 terminal No.71 to the
intake air temperature pressure sensor harness connector EN16 terminal No.3 and an internal low
reference voltage through EN01 terminal No.76 to the intake air temperature pressure sensor
EM16 terminal No.4. When the intake air temperature pressure sensor in cold, the sensor
resistance is relatively high. When the air temperature rises, the sensor resistance decreases. When
the sensor resistance is high, ECM detected intake air temperature pressure sensor signal circuit
voltage is high. With the decrease of sensor resistance, ECM detected intake air temperature
pressure sensor signal circuit voltage also decreases.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection
Strategy

Conditions For Setting The
DTC (Control Strategy)

Fault Locations

1. MAT circuit is short to

ground.

2. MAT signal voltage

becomes 0 immediately.

P0112

P0113

1. More Than the

Upper Limit

2. Lower Than the

Lower Limit

1. MAT circuit is open or

short to 5 V reference
voltage.

1. Sensor

Circuit

2. Sensor

3. ECM.

3. Circuit

sketch

Circuit diagram refers to 2.12.7.18 Circuit Diagram in DTC P0107 P0108.

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 if there are the following conditions:

(a) Sensor housing is damaged.

(b) Sensor loose or improperly installed.

(c) Sensor wiring harness connector loose.

It is not allowed to connect 5 V reference voltage circuit of intake manifold absolute pressure
sensor and other components of the vehicle, as this will damage the sensors and ECM.

Step 2

Measure intake air pressure and temperature sensor resistance.

Next

743

(a) Rotated ignition switch to OFF

position .

(b)

Disconnect intake pressure
temperature sensor harness
connector EN16.

(c) Measure intake air temperature

sensor resistance.

Standard Resistance: (Refer to
2.12.1.2 Temperature and Resistance
Correlation of Temperature Sensor
to get the the specific parameters.):
2308.8-2726.8Ω/20°C(68ºF)

(d) Connect

intake

pressure

temperature sensor harness
connector EN16.

NL02-2046b

1

2

3

4

进气温度压力传感器

4

3

Is resistance the specified value?

Step 3

Measure intake air temperature pressure sensor signal circuit.

(a) Rotated ignition switch to OFF

position .

(b)

Disconnect intake pressure
temperature sensor harness
connector EN16.

(c) Rotated ignition switch to ON

position .

(d) Measure voltage between intake

pressure temperature sensor
harness connector EN16 terminal
No.3 and a reliable ground.

Standard Voltage: 4.7-5.5V

(e) Connect

intake

pressure

temperature sensors connector
EN16.

NL02-2047b

4

3

2

1

EN16 进气温度压力传感器线束连接器

3

Is the voltage normal?

Step 4

Measure intake air temperature pressure sensor ground circuit.

(a) Rotated ignition switch to OFF position .

No

Replace the intake pressure temperature
sensor.

Yes

No

Replace the intake pressure temperature
sensor.

Yes

Air intaketemperature pressure sensor

EN16Air intaketemperature pressure

sensor harness connector

744

(b)

Disconnect intake pressure
temperature sensor harness
connector EN16.

(c) Rotated ignition switch to ON

position .

(d)

Measure resistance between
intake pressure temperature
sensor harness connector EN16
terminal No.4 and a reliable
ground.

Standard Resistance: Less than 3 Ω

(e) Connect

intake

pressure

temperature sensor harness
connector EN16.

NL02-2041b

4

3

2

1

EN16 进气温度压力传感器线束连接器

4

Is the resistance normal?

Step 5

Inspect intake air temperature pressure sensor signal circuit.

(a) Rotated ignition switch to OFF

position .

(b)

Disconnect intake pressure
temperature sensor harness
connector EN16.

(c)

Disconnect ECM harness
connector EN01.

(d) Measure resistance between

intake pressure temperature
sensor harness connector EN16
terminal No.3 and ECM harness
connector terminal No.71. Inspect
whether the circuit is open.

NL02-2047b

4

3

2

1

EN16 进气温度压力传感器线束连接器

3

No

Go to step 6

Yes

Go to step 7

EN16Air intaketemperature pressure

sensor harness connector

EN16Air intaketemperature pressure

sensor harness connector

745

(e) Measure resistance between

intake pressure temperature
sensor harness connector EN16
terminal No.3 and a reliable
ground. Inspect whether the
circuit is short to ground.

(f) Measure voltage between intake

pressure temperature sensor
harness connector EN16 terminal
No.3 and a reliable ground.
Inspect whether the circuit is
short to power supply.

NL02-2048b

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

71

Test Items

Standard Value

EN16(3)-EN01(71)Resistance value

Less than 1 Ω

Resistance Between EN16 (3) and A Reliable Ground

10 kΩ or higher

Voltage Between EN16 (3) and A Reliable Ground

0V

Step 6

Inspect intake air temperature pressure sensor ground circuit.

(a) Rotated ignition switch to OFF

position .

(b)

Disconnect intake pressure
temperature sensor harness
connector EN16.

(c)

Disconnect ECM harness
connector EN01.

(d)

Measure resistance between
intake pressure temperature
sensor harness connector EN16
terminal No.4 and ECM harness
connector terminal No.76. Inspect
whether the circuit is open. If
there is no open circuit, repair the
faulty part.

NL02-2041b

4

3

2

1

EN16 进气温度压力传感器线束连接器

4

Next

Go to step 6

EN01 engine control module harness

connector

EN16 air intaketemperature pressure

sensor harness connector

746