3. Schematic:

Throttle Body Position Sensor

Engine 

Control 

Module

FE02-5035b

4. Diagnostic Steps:

Note

Before carrying out this diagnosis step, observe the data list on scan tool and analyze the accuracy of the data, as
these will help with quick diagnosis.

Step 1

Initial Inspection

(a)

Check whether there is a loose sensor wiring harness
connector.

(b)

Check whether a damages sensor.

Next

Step 2

Measure throttle position sensor resistance.

Engine

Control System JL4G18-D

2-103

Throttle Body Position Sensor

FE02-5036b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect throttle position sensor wiring harness connector
EN27.

(c)

Measure throttle position sensor resistance.

Test Items

Standard Resistance

Value

Terminal 1 and Terminal 2

3,000 Ω

Terminal 2 and Terminal 3

Changes between

1,300 Ω and 2,900 Ω

(d)

Connect throttle position sensor wiring harness connector
EN27.

Is resistance the specified value?

No

Replace throttle position sensor. Go to step
11

Yes

Step 3

Measure throttle position sensor 5 V reference voltage.

Throttle Body Position Sensor Harness Connector EN27

1

2

3

FE02-5037b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect throttle position sensor wiring harness connector
EN27.

(c)

Turn the ignition switch to "ON" position.

(d)

Measure voltage between throttle position sensor EN27
terminal No.2 and a reliable ground.

Standard Voltage: 4.5-5.5 V

(e)

Connect throttle position sensor wiring harness connector
EN27.

Is voltage the specified value?

No

Go to step 6

Yes

Step 4

Measure throttle position sensor signal circuit.

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Control System JL4G18-D

Engine

Throttle Body Position Sensor 
Harness Connector EN27

1

2

3

FE02-5038b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect throttle position sensor wiring harness connector
EN27.

(c)

Turn the ignition switch to "ON" position.

(d)

Connect a 5A fuse between EN27 terminal No.2 and No.3.
Use scan tool to read "the actual throttle position sensor
voltage" parameter.

Standard Voltage: 4.5-5.5 V

(e)

Connect throttle position sensor wiring harness connector
EN27.

Is data normal?

No

Go to step 7

Step 5

Measure throttle position sensor ground circuit.

Throttle Body Position Sensor 
Harness Connector EN27

1

2

3

FE02-5039b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect throttle position sensor wiring harness connector
EN27.

(c)

Measure resistance between throttle position sensor wiring
harness connector EN27 terminal No.1 and a reliable ground.

Standard Resistance: Less than 1 Ω

(d)

Connect throttle position sensor wiring harness connector
EN27.

No

Go to step 8

Yes

Go to step 9

Step 6

Check throttle position sensor 5 V reference voltage circuit.

Engine

Control System JL4G18-D

2-105

1

3

5

7

8

6

4

2

9

10

11

12

13

23

24

25

26

27

28

29

30

37

51

52

53

54

55

56

57

58

59

60

61

62

63

64

38

39

40

41

42

43

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48

49

50

31

32

33

34

35

36

14

15

16

17

18

19

20

21

22

ECM Harness Connector EN01

Throttle Body Position Sensor 
Harness Connector EN27

1

2

3

FE02-5040b

(a)

Turn the ignition switch to "OFF" position.

(b)

Disconnect throttle position sensor wiring harness connector
EN27.

(c)

Disconnect ECM harness connector EN01.

(d)

Measure resistance between throttle position sensor wiring
harness connector EN27 terminal No.2 and ECM harness
connector terminal No.18. check whether there is open
circuit. If there is no open circuit, repair the faulty part.

(e)

Measure resistance between throttle position sensor wiring
harness connector EN27 terminal No.2 and a reliable ground.
Check whether the circuit is short to ground. If there is no
short circuit, repair the faulty part.

(f)

Measure voltage between throttle position sensor wiring
harness connector EN27 terminal No.2 and a reliable ground.
Check whether the circuit is short to power supply. If there is
no short circuit, repair the faulty part.

Test Items

Standard Value

Resistance Between EN27 (2) and EN01
(18)

Less than 1 Ω

Resistance Between EN27 (2) and a
Reliable Ground

10 kΩ or higher

Voltage Between EN27 (2) and a Reliable
Ground

0 V

Normal

Go to step 9

Step 7

Check throttle position sensor signal circuit.

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Control System JL4G18-D

Engine