3. Schematic:

12

01

18

04

PWR GND

EO35

73

EO35

EO35

EO35

EO35

EO35

VBAT

1

IGN

3

MPR

VBATPROT

VBATPROT

6

62

22

Main Relay

Engine 

Control 

Module

Ignition Switch

FE02-5286b

4. Diagnostic Steps:

Step 1

Visual Inspection.

(a)

Check main relay for signs of damage.

Yes

Replace the main relay. Go to step 10.

No

Step 2

Check ECM harness connector EO35 terminal No.62.

Engine

Control System JL4G15-D

2-767

FE02-5298b

1

17

33

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

ECM Harness Connector EO35

(a)

Turn the ignition switch to "OFF" position.

(b)

Remove of ECM harness connector EO35.

(c)

Measure voltage between ECM harness connector EO35
terminal No.62 and a reliable ground.

(d)

Measure resistance between ECM harness connector EO35
terminal No.62 and a reliable ground.

Standard Value:

Test Items

Specified Value

Voltage Between EO35 (62) and A Reliable
Ground

11-14 V

Resistance Between EO35 (62) and A
Reliable Ground

10 kΩ or higher

All normal?

No

Repair circuit between the battery and EO35
terminal No.62. Go to step 10.

Yes

Step 3

Check ECM harness connector EO35 terminals No.6 and 22.

FE02-5299b

1

17

33

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

ECM Harness Connector EO35

(a)

Turn the ignition switch to "OFF" position.

(b)

Measure resistance between ECM harness connector EO35
terminals No.6, 22 and a reliable ground.

(c)

Connect EO35 terminal NO.62 to ground.

(d)

Measure voltage between ECM harness connector EO35
terminals No.6, 22 and a reliable ground.

Standard Value:

Test Items

Specified Value

Resistance Between EO35 (6,22) and A
Reliable Ground

10 kΩ or higher

Voltage Between EO35 (6,22) and A
Reliable Ground

11-14 V

All normal?

No

Go to step 5

Yes

Step 4

Check the ignition switch input signal.

2-768

Control System JL4G15-D

Engine

FE02-5300b

1

17

33

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

ECM Harness Connector EO35

(a)

Turn the ignition switch to "ON" position.

(b)

Measure voltage between ECM harness connector EO35
terminal No.3 and a reliable ground.

Standard Value:

Test Items

Specified Value

Voltage Between EO35 (3) and A Reliable
Ground

11-14 V

(c)

Turn the ignition switch to "OFF" position.

Voltage normal?

No

Repair circuit between the battery and EO35
terminal No.3.

Yes

Go to step 8

Step 5

Check main relay terminals No.2 and 5 voltage.

1413 12 1110

5

1

2

3

4

6

7

8

9

J

L

K

I

G

D

C

B

E

F

A

86

86

30

87

85

86

86

87

87

87

30

30

30

85

85

85

2

2

3

3

5

5

1

1

1

2

5 3

1

2

5 3

86

87

30

1

1

2

5
3

2

5
3

85

EF14

EF24

EF28

EF27

EF26

EF18

EF07

EF06

EF30

EF19

EF20

EF21

EF22

EF23

EF25

EF15

EF16

EF17

EF13

EF12

EF1

1

EF10

EF09

EF08

EF05

EF04

EF03

EF02

EF01

G

1

3

2

5

FE02-5301b

(a)

Remove the main relay.

(b)

Measure voltage between the main relay terminal No.2,5 and
a reliable ground.

(c)

Measure resistance between the main relay terminal No.2,5
and a reliable ground.

Standard Value:

Test Items

Standard Value

Voltage Between The Main Relay Terminal
No.2,5 and A Reliable Ground

11-14 V

Resistance Between The Main Relay
Terminal No.2,5 and A Reliable Ground

10 kΩ or higher

All normal?

No

Repair battery to the main relay terminal No.
2,5 circuit.

Yes

Step 6

Check main relay terminal No.3.

Engine

Control System JL4G15-D

2-769

1413 12 1110

5

1

2

3

4

6

7

8

9

J

L

K

I

G

D

C

B

E

F

A

86

86

30

87

85

86

86

87

87

87

30

30

30

85

85

85

2

2

3

3

5

5

1

1

1

2

5 3

1

2

5 3

86

87

30

1

1

2

5
3

2

5
3

85

EF14

EF24

EF28

EF27

EF26

EF18

EF07

EF06

EF30

EF19

EF20

EF21

EF22

EF23

EF25

EF15

EF16

EF17

EF13

EF12

EF1

1

EF10

EF09

EF08

EF05

EF04

EF03

EF02

EF01

G

1

2

5 3

FE02-5302b

(a)

Install the main relay.

(b)

Connect ECM harness connector EO35 terminal No.62 to
ground.

(c)

Measure voltage between main relay terminal No.3 and a
reliable ground.

Standard voltage: 11-14 V

Voltage normal?

No

Replace the main relay. Go to step 10

Yes

Step 7

Test continuity between main relay and ECM harness connector.

1413 12 1110

5

1

2

3

4

6

7

8

9

J

L

K

I

G

D

C

B

E

F

A

86

86

30

87

85

86

86

87

87

87

30

30

30

85

85

85

2

2

3

3

5

5

1

1

1

2

5 3

1

2

5 3

86

87

30

1

1

2

5
3

2

5
3

85

EF14

EF24

EF28

EF27

EF26

EF18

EF07

EF06

EF30

EF19

EF20

EF21

EF22

EF23

EF25

EF15

EF16

EF17

EF13

EF12

EF1

1

EF10

EF09

EF08

EF05

EF04

EF03

EF02

EF01

G

1

2

5 3

1

17

33

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

ECM Harness Connector EO35

FE02-5303b

(a)

Remove the main relay.

(b)

Measure resistance between main relay terminal No.3 and
ECM harness connector EO35 terminals No. 6,22.

Standard Resistance: Less than 1 Ω

Resistance normal?

No

Repair the circuit between main relay terminal
No.3 and ECM harness connector EO35
terminals No. 6,22.

Step 8

Check ECM power supply circuit.

(a)

Check whether ECM power supply circuit is normal.

(b)

Check whether ECM ground circuit is normal.

No

Repair ECM Power Supply Circuits.

Yes

Step 9

Replace ECM.

2-770

Control System JL4G15-D

Engine