Suzuki Grand Vitara JB416 / JB420. Manual — part 48

1A-141 Engine General Information and Diagnosis:

DTC P0443: Evaporative Emission System Purge Control Valve Circuit

S5JB0A1104045

Wiring Diagram

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

WARNING

!

• When performing a road test, select a place where there is no traffic or possibility of a traffic

accident and be very careful during testing to avoid occurrence of an accident.

• Road test should be carried out by 2 persons, a driver and a tester, on a level road.

1) With ignition switch OFF, connect scan tool to DLC.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up normal operating temperature.
4) Drive vehicle at more than 40 km/h, 25 mph for 5 min. or more.
5) Check DTC and pending DTC.

I5JB0A110054-02

1. EVAP canister purge valve

4. Fuse box No.2

7. “FI” fuse

2. Main relay

5. Ignition switch

8. “IGN” fuse

3. “IG COIL” fuse

6. ECM

DTC detecting condition

Trouble area

Monitor signal of EVAP canister purge valve is different from
command signal. (Circuit open or short)
(2 driving cycle detection logic)

• EVAP canister purge valve
• EVAP canister purge valve circuit
• ECM

Engine General Information and Diagnosis: 1A-142

DTC Troubleshooting

WARNING

!

In order to reduce risk of fire and personal injury, this work must be performed in a well ventilated area
and away from any open flames such as gas water heater.

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

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”.

2

EVAP canister purge power supply circuit check
1) Turn OFF ignition switch and disconnect connector from

EVAP canister purge valve.

2) Measure voltage between engine ground and “BLU/

BLK” wire terminal of EVAP canister purge valve
connector with ignition switch turned ON.

Is it voltage 10 – 14 V?

Go to Step 3.

“BLU/BLK” wire is open
circuit.

3

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

turned OFF.

2) Measure resistance between “C37-13” terminal of ECM

connector and vehicle body ground.

Is resistance infinity?

Go to Step 4.

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

4

Wire circuit check
1) Measure voltage between “C37-13” terminal of ECM

connector and vehicle body ground with ignition switch
turned ON.

Is voltage 0 V?

Go to Step 5.

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

5

Wire circuit check
1) Connect connector to purge control valve with ignition

switch turned OFF.

2) Turn ON ignition switch and measure voltage between

“C37-13” terminal of ECM connector and vehicle body
ground.

Is it voltage 10 – 14 V?

Go to Step 6.

“GRN/BLK” wire is open
circuit.

6

EVAP canister purge control valve check
1) Check EVAP canister purge control valve referring to

“EVAP Canister Purge Valve Inspection in Section 1B”.

Is it in good condition?

Go to Step 7.

Faulty EVAP canister
purge control valve.

7

EVAP canister purge control circuit check
1) With ignition switch turn OFF, measure resistance

between “E23-1/16” terminal and “C37-13” terminal of
ECM connector.

Is resistance below 40

Ω

at 20

°

C, 68

°

F?

Faulty ECM. Substitute
a known-good ECM and
recheck.

“GRN/BLK” and/or
“BLU/BLK” wire are high
resistance circuit.

1A-143 Engine General Information and Diagnosis:

DTC P0462: Fuel Level Sensor Circuit Low

S5JB0A1104047

Wiring Diagram

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and run it for 30 sec. or more.
4) Check DTC and pending 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

12 V

1

5

E23-24

YEL/RED

BLK/YEL

YEL/GRN

PNK

BLK

WHT/GRN

E23-15

BLK/WHT

BLU/BLK

BLU/BLK

BLU/BLK

WHT/GRN

BLK/RED

BLK/RED

BLK/RED

BLK/YEL

BLU

12V

5V

6

7

4

3

2

E23-1

E23-60

E23-16

BLU/BLK

I5JB0A110055-02

1. Fuel pump assembly

4. Sub fuel level sensor

7. Fuel pump relay

2. Fuel pump

5. ECM

3. Main fuel level sensor

6. Main relay

DTC detecting condition

Trouble area

Fuel level sensor voltage is lower than specified value for 3
seconds continuously.
(1 driving cycle detection logic but MIL does not light up)

• ECM power and/or ground circuit malfunction
• ECM malfunction
• Fuel level sensor and/or its circuit malfunction

Engine General Information and Diagnosis: 1A-144

DTC Troubleshooting

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

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”.

2

Do you have SUZUKI scan tool?

Go to Step 3.

Go to Step 4.

3

Fuel level sensor output signal check with SUZUKI scan
tool
1) Connect SUZUKI scan tool to DLC with ignition switch

turned OFF.

2) Turn ON ignition switch and check fuel level displayed

on SUZUKI scan tool.

Is 100% displayed?

Go to Step 5.

Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.

4

Fuel level sensor output signal check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connector

connected.

3) Turn ON ignition switch and measure voltage between

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

Is voltage about 3.5 V or less?

Go to Step 5.

Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.

5

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

Removal and Installation in Section 1G”.

2) Disconnect connectors from ECM with ignition switch

turned OFF.

3) Measure resistance between “E23-24” terminal of ECM

connector and vehicle body ground.

Is resistance infinity?

Go to Step 6.

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

6

Fuel level sensor output signal circuit check
1) Connect connectors to ECM.
2) Measure voltage between “E23-24” terminal of ECM

connector and engine ground with ignition switch turned
ON.

Is voltage 10 – 14 V?

Go to Step 7.

Substitute a known-
good ECM and recheck.

7

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
level sensor is shorted
to ground circuit. If wire
is OK, substitute a
known-good ECM and
recheck.

Faulty fuel level sensor.