Suzuki Grand Vitara JB627. Manual - part 70

1A-229 Engine General Information and Diagnosis: 

2

Fuel pump relay power supply check
1) Disconnect fuel pump relay from fuse box No.2 with 

ignition switch turned OFF.

2) Check for proper connection to fuel pump relay at each 

terminal.

3) If OK, turn ON ignition switch, measure voltage between 

“WHT/GRN” wire terminal of fuel pump relay connector 
and engine ground.

Is voltage 10 – 14 V?

Go to Step 3.

“WHT/GRN” wire is 
open or shorted to 
ground circuit.

3

Fuel pump relay power supply check
1) Turn ON ignition switch, measure voltage between “BLU/

BLK” wire terminal of fuel pump relay connector and 
engine ground.

Is voltage 10 – 14 V?

Go to Step 4.

“BLU/BLK” wire is open 
circuit.

4

Fuel pump relay check
1) Check fuel pump relay referring to “Engine and Emission 

Control System Relay Inspection in Section 1C”.

Is relay in good condition?

Go to Step 5.

Faulty relay.

5

Fuel pump relay drive signal check
1) Connect fuel pump relay to fuse box No.2.
2) Connect voltmeter between “E23-24” terminal of ECM 

connector and vehicle body ground.

3) Measure voltage 2 second after ignition switch is turned 

ON.

Is voltage 10 – 14 V?

Go to Step 6.

“WHT/GRN” wire is 
open circuit or shorted 
to ground circuit.

6

Fuel pump relay drive signal check
1) Measure voltage within 2 second after ignition switch is 

turned ON.

Is voltage 0 – 1 V?

Go to Step 7.

Substitute a known 
good ECM and recheck.

7

Wire circuit check
1) Turn OFF ignition switch.
2) Detach fuel tank referring to “Fuel Tank Removal and 

Installation in Section 1G”.

3) Disconnect connector from fuel pump.
4) Measure resistance between “PNK” wire terminal of fuel 

pump connector and vehicle body ground.

Is resistance infinity?

Go to Step 8.

“PNK” wire is shorted to 
ground.

8

Fuel pump circuit check
1) Connect service wire between “E23-24” terminal of ECM 

connector and vehicle body ground.

2) Turn ON ignition switch, measure voltage between 

“PNK” terminal at fuel pump connector and vehicle body 
ground.

Is voltage 10 – 14 V?

Go to Step 9.

“PNK” wire is open 
circuit.

9

Fuel pump circuit check
1) Turn OFF ignition switch.
2) Measure resistance between “BLK” wire terminal at fuel 

pump connector and vehicle body ground.

Is resistance less than 5 

Ω

?

Faulty fuel pump.

“BLK” wire is open 
circuit.

Step

Action

Yes

No

Engine General Information and Diagnosis:  1A-230

Fuel Pressure Check

S6JB0B1104088

System Diagram

Special tool
(A):  09912–58442
(B):  09912–58432
(C):  09912–58490

(C)

(B)

(A)

(C)

1

(A)

(B)

3

1

1

2

2

4

I6JB01110012-01

1. Injector

2. Delivery pipe

3. Fuel pressure regulator

4. Fuel filter and fuel pump

1A-231 Engine General Information and Diagnosis: 

Troubleshooting

NOTE
Before using following flow, check to make sure that battery voltage is higher than 11 V. If battery 
voltage is low, pressure becomes lower than specification even if fuel pump and line are in good 
condition.

 

Step

Action

Yes

No

1

Fuel pump operating sound check
1) Remove fuel filler cap and then turn ON ignition switch.

Can you hear operating sound? (Is fuel pump to operate 
about 2 seconds after ignition switch is turned ON?)

Go to Step 2.

Go to “Fuel Pump and 
Its Circuit Check”.

2

Fuel pressure check
1) Check fuel pressure referring to “Fuel Pressure 

Inspection in Section 1G”.

Is check result satisfactory?

Go to Step 3.

Go to Step 6.

3

Fuel pressure check
1) Start engine and warm it up to normal operating 

temperature.

2) Keep engine speed at 4000 rpm.

Does fuel pressure show about the same value as Step 2?

Go to Step 4.

Go to Step 8.

4

Fuel line check
1) Check fuel pipe, fuel hose and joint for fuel leakage.

Are they in good condition?

Go to Step 5.

Repair or replace 
defective part.

5

Fuel line check
1) Check fuel pipe, fuel hose and joint for damage or 

deform.

Are they in good condition?

Faulty fuel pressure 
regulator.

Repair or replace 
damaged or damaged 
part.

6

Was fuel pressure higher than specification in Step 2?

Go to Step 7.

Go to Step 8.

7

Fuel line check
1) Check fuel pipe, fuel hose and joint for damage or 

deform.

Are they in good condition?

Faulty fuel pressure 
regulator.

Repair or replace 
damaged or damaged 
part.

8

Fuel line check
1) Check fuel pipe, fuel hose and joint for damage or 

deform.

Are they in good condition?

Clogged fuel filter, faulty 
fuel pump, faulty fuel 
pressure regulator or 
fuel leakage from hose 
connection in fuel tank.

Repair or replace 
defective part.

Engine General Information and Diagnosis:  1A-232

A/C System Circuits Check

S6JB0B1104089

Wiring Diagram

1

3 2

4

5

6

7

8

9

1110

12

13

14

15

16

17

18

19

20

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

33

34

35

36

37

38

39

40

32

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

E23

C37

5V

RED/BLK

BLU/BLK

BLK

RED

YEL/GRN

RED/YEL

BLK

BLU

BLU

BLU/WHT

YEL/GRN

5V

WHT/BLU

WHT/RED

RED

WHT

WHT/BLU

WHT/RED

RED

WHT

5V

PNK/GRN

YEL/RED

WHT/BLK

BLK/RED

12V

PNK

GRY/RED

GRY/BLK

WHT/RED

E23-37

E23-15

E23-23

E23-14

C37-49
C37-48

C37-26
C37-67

E23-17

E23-9

YEL/GRN

YEL/GRN

5V

PPL/YEL

GRY/GRN

BLU/RED

BLU/YEL

1

3

5

7

8

10

6

9

11

13

14

12

15

16

4

2

I6JB01110013-03

1. BCM

5. Evaporator temperature sensor

9. Compressor

13. Radiator cooling fan No.1

2. ABS or ESP

® control module

6. “IG2 SIG” fuse

10. Radiator cooling fan relay No.1

14. Radiator cooling fan No.2

3. HVAC control module

7. “CPRSR” fuse

11. Radiator cooling fan relay No.2

15. A/C refrigerant pressure sensor

4. ECM

8. Compressor relay

12. Radiator cooling fan relay No.3

16. ECT sensor