Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 76

1A-251 Engine General Information and Diagnosis: For Petrol Engine Model

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: For Petrol Engine Model 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 “E23-15” 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: For Petrol Engine Model 1A-252

Fuel Pressure Check

S6JB0A1114084

System Diagram

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

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.

 

4

(C)

(B)

(A)

1

2

3

I2RH01110133-01

1. Injector

2. Delivery pipe

3. Fuel pressure regulator

4. Fuel filter and fuel pump

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?

Go to Step 2.

Go to “Fuel Pump and 
Its Circuit Check: For 
Petrol Engine Model”.

2

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

Inspection: For Petrol Engine Model 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.

1A-253 Engine General Information and Diagnosis: For Petrol Engine Model

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.

Step

Action

Yes

No

Engine General Information and Diagnosis: For Petrol Engine Model 1A-254

A/C System Circuits Check

S6JB0A1114085

Wiring Diagram

Troubleshooting

NOTE

• Before performed troubleshooting, be sure to read the “Precautions of ECM Circuit Inspection: For 

Petrol Engine Model”.

• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the 

special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits: For 
Petrol Engine Model”.

• When A/C evaporator outlet air temp. is below 0 

°C (32 °F) (for J20 engine) or 1.3 °C (34.3 °F) (for M16 

engine), A/C remains OFF (“E23-49” terminal voltage becomes 10 – 14 V). This condition is not 
abnormal.

 

E23

C37

3

4

18

19

5

6

7

10

11

17

20

47

46

49

50

51

21

22

52

16

25

9

24

14
29

55

57

54 53

59

60

58

2

26

27

28

15
30

56

48

32

31

34

35

36

37

40

42

39 38

44

45

43

41

33

1

12

13

23

8

3

4

18

19

5

6

7

10

11

17

20

47

46

49

50

51

21

22

52

16

25

9

24

14
29

55

57

54 53

59

60

58

2

26

27

28

15
30

56

48

32

31

34

35

36

37

40

42

39 38

44

45

43

41

33

1

12

13

23

8

5V

RED/BLK

E23-46  

E23-47  

BLU/RED

BLU/YEL

BLU/BLK

E23-48  

PPL/YEL

GRY/GRN

C37-24  
C37-57  

BLK

RED

YEL/GRN

RED/YEL

BLK

BLU

BLU

BLU/WHT

YEL/GRN

5V

WHT/BLU

WHT/RED

E23-4

E23-19

RED

WHT

WHT/BLU

WHT/RED

RED

WHT

5V

PNK/GRN

YEL/RED

WHT/BLK

BLK/RED

12V

PNK

*RED

GRY/RED

GRY/BLK

C37-14  
C37-12  

WHT/RED

E23-49  

YEL/GRN

YEL/GRN

5V

1

2

4

9

11

12

15

16

5

8

14

13

7

10

3

6

I5JB0A110103-02

1. BCM

6. “IG2 SIG” fuse

11. Radiator cooling fan relay No.2

16. ECT sensor

2. ABS / ESP

® control module

7. “CPRSR” fuse

12. Radiator cooling fan relay No.3

*: For M16 engine

3. HVAC control module

8. Compressor relay

13. Radiator cooling fan No.1

4. ECM

9. Compressor

14. Radiator cooling fan No.2

5. Evaporator temperature sensor

10. Radiator cooling fan relay No.1

15. A/C refrigerant pressure sensor