Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 51

1A-151 Engine General Information and Diagnosis: For Petrol Engine Model

7

Short circuit check for fuel level sensor output signal
circuit
1) Turn ON ignition switch and measure voltage between

“E23-24” terminal of ECM connector and vehicle body
ground.

Is voltage 0 V?

Go to Step 8.

“YEL/RED” wire shorted
to other circuit.

8

Open circuit check for fuel level sensor output signal
circuit
1) Disconnect fuel pump connector referring to “Fuel Tank

Removal and Installation: For Petrol Engine Model in
Section 1G”.

2) Check for proper connection to “YEL/RED” and “YEL/

GRN” wire terminals of fuel pump connector.

3) Connect connectors to ECM.
4) Turn ON ignition switch, measure voltage between “YEL/

RED” wire terminal of disconnected fuel pump connector
and vehicle body ground.

Is voltage 10 – 14 V?

Go to Step 10.

Go to Step 9.

9

Open circuit check for fuel level sensor output signal
circuit
1) Measure voltage between “E23-24” terminal of ECM

connector and engine ground.

Is voltage 10 – 14 V?

“YEL/RED” wire is open
circuit.

Substitute a known-
good ECM and recheck.

10 Fuel level sensor ground circuit check

1) Disconnect connector from sub fuel lever sensor with

ignition switch turned OFF.

2) Measure resistance between “BLK/YEL” wire terminal of

fuel pump connector and vehicle body ground.

Is resistance below 5

Ω

?

Go to Step 11.

“BLK/YEL” wire in open
or high resistance
circuit.

11 High resistance circuit check for fuel level sensor circuit

1) Disconnect connectors from ECM.
2) Measure resistance between “YEL/RED” wire terminal of

fuel pump connector and “E23-24” wire terminal of ECM
connector.

Is resistance below 5

Ω

?

Go to Step 12.

“YEL/RED” wire is high
resistance circuit.

12 Fuel level sensor check

1) Check fuel level sensor (main and sub) referring to “Fuel

Level Sensor Inspection in Section 9C”.

Is it in good condition?

“YEL/GRN” wire
between main fuel lever
sensor and sub fuel
lever sensor is open or
high resistance. If wire
is OK, substitute a
known-good ECM and
recheck.

Faulty fuel level sensor.

Step

Action

Yes

No

Engine General Information and Diagnosis: For Petrol Engine Model 1A-152

DTC P0480: Fan 1 (Radiator Cooling Fan) Control Circuit

S6JB0A1114050

Wiring Diagram

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) Turn OFF ignition switch.
2) Clear DTC with ignition switch turned ON.
3) Run engine at idle speed.
4) Check DTC.

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

1

2

10

3

4

8

5

9

BLK

RED

YEL/GRN

C37-15

C37-29
C37-48

BLK/ORN

C37-58

C37-30 BLK/ORN

BLK/YEL
BLK/YEL
BLK/YEL

RED/YEL

BLK

BLU

BLU

YEL/GRN

BLU/WHT

YEL/GRN

6

7

I5JB0A110056-01

1. Fuse box No.2

5. Radiator cooling fan relay No. 3

9. ECT sensor

2. Ignition switch

6. Radiator cooling fan motor No.1

10. “IG2 SIG” fuse

3. Radiator cooling fan relay No. 1

7. Radiator cooling fan motor No.2

4. Radiator cooling fan relay No. 2

8. ECM

DTC detecting condition

Trouble area

Monitored voltage of radiator cooling fan relay output is
different from its command signal.
(1 driving cycle detection logic)

• Radiator cooling fan relay circuit malfunction
• Radiator cooling fan relay malfunction
• ECM malfunction

1A-153 Engine General Information and Diagnosis: For Petrol Engine Model

DTC Troubleshooting

NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions for DTC Troubleshooting: For Petrol Engine Model”.

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check”
performed?

Go to Step 2.

Go to “Engine and
Emission Control
System Check: For
Petrol Engine Model”.

2

Wire circuit check
1) Disconnect connectors from ECM with ignition switch

turned OFF.

2) Check for proper connection to ECM at “E23-46”, “E23-

47” and “E23-48” terminals.

3) If OK, turn ON ignition switch.
4) Measure voltage between “E23-46” terminal of ECM

connector and vehicle body ground.

Is voltage 10 – 14 V?

Go to Step 3.

Go to Step 4.

3

Radiator cooling fan control No.1 check
1) Connect connectors to ECM with ignition switch turned

OFF.

2) Run engine until ECT is over 97.5

°C 207.5 °F.

3) Measure voltage between “E23-46” terminal of ECM

connector and vehicle body ground.

Is voltage below 1.5 V?

Go to Step 8.

Substitute a known-
good ECM and recheck.

4

Wire circuit check
1) Disconnect radiator cooling fan relay No.1 (1) from relay

box (2) with ignition switch turned OFF.

2) Turn ON ignition switch.
3) Measure voltage between “YEL/GRN” wire terminal of

radiator cooling fan relay No.1 connector and vehicle
body ground.

Is voltage 10 – 14 V?

Go to Step 5.

“YEL/GRN” wire is open
circuit.

5

Wire circuit check
1) Measure resistance between “RED/BLK” wire terminal of

radiator cooling fan relay No.1 connector and vehicle
body ground with ignition switch turned OFF.

Is resistance infinity?

Go to Step 6.

“RED/BLK” wire is
shorted to ground
circuit.

1

2

I5JB0A110057-02

Engine General Information and Diagnosis: For Petrol Engine Model 1A-154

6

Wire circuit check
1) Measure voltage between “RED/BLK” wire terminal of

radiator cooling fan relay No.1 connector and vehicle
body ground with ignition switch turned ON.

Is voltage 0 V?

Go to Step 7.

“RED/BLK” wire is
shorted to other circuit.

7

Wire circuit check
1) Measure resistance between “RED/BLK” wire terminal of

radiator cooling fan relay No.1 connector and “E23-46”
terminal of ECM connector with ignition switch turned
OFF.

Is resistance below 2

Ω

?

Go to Step 20.

“RED/BLK” wire is open
circuit.

8

Wire circuit check
1) Disconnect connectors from ECM with ignition switch

turned OFF.

2) Measure voltage between “E23-47” terminal of ECM

connector and vehicle body ground with ignition switch
turned ON.

Is voltage 10 – 14 V?

Go to Step 9.

Go to Step 10.

9

Radiator cooling fan control No.2 check
1) Connect connectors to ECM with ignition switch turned

OFF.

2) Run engine until ECT is over 102.5

°C, 216.5 °F.

3) Measure voltage between “E23-47” terminal of ECM

connector and vehicle body ground.

Is voltage below 1.5 V?

Go to Step 14.

Substitute a known-
good ECM and recheck.

10 Wire circuit check

1) Disconnect radiator cooling fan relay No.2 (1) from relay

box (2) with ignition switch turned OFF.

2) Turn ON ignition switch.
3) Measure voltage between “YEL/GRN” wire terminal of

radiator cooling fan relay No.2 connector and vehicle
body ground.

Is voltage 10 – 14 V?

Go to Step 11.

“YEL/GRN” wire is open
circuit.

11 Wire circuit check

1) Measure resistance between “RED” wire terminal of

radiator cooling fan relay No.2 connector and vehicle
body ground with ignition switch turned OFF.

Is resistance infinity?

Go to Step 12.

“RED” wire is shorted to
ground circuit.

Step

Action

Yes

No

2

1

I5JB0A110058-02