Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 13

 

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Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 13

 

 

1A-48 Engine General Information and Diagnosis: 

Inspection of ECM and Its Circuits

S5JB0E1104080

ECM and its circuits can be checked by measuring voltage, pulse signal and resistance with special tool connected.

CAUTION

!

 

ECM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ECM 
with ECM connectors disconnected from it.

 

Voltage Check

1) Remove ECM (1) from its bracket referring to “Engine Control Module (ECM) Removal and Installation in Section 

1C in related manual”.

2) Connect special tool between ECM and ECM connectors securely.

Special tool
(A):  09933–06320 

3) Check voltage and/or pulse signal using voltmeter (2) and oscilloscope (3).

NOTE

• As each terminal voltage is affected by battery voltage, confirm that it is 11 V or more when ignition 

switch is turned ON.

• Voltage with asterisk (*) cannot be measured with voltmeter because it is pulse signal. Use 

oscilloscope for its check if necessary.

• Before performed this inspection, be sure to read the “Precautions of ECM Circuit Inspection in 

related manual”.

 

Viewed from harness side

1

2

3

(A)

I5JB0A110073-01

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

I4RS0A110055-01

Engine General Information and Diagnosis:  1A-49

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks

C37-1

PNK

Fuel injector No.1

10 – 14 V

Ignition switch turned ON.

*0 – 0.6 V

↑↓

10 – 14 V

(“Reference 

waveform No.1: ”, 

“Reference waveform 

No.2: ” and 

“Reference waveform 

No.31: ”)

Engine running at idle 
after warmed up engine.

Output signal is active low 
pulse. Pulse frequency 
varies depending on 
engine speed.

C37-2

PNK/

BLK

Fuel injector No.2

10 – 14 V

Ignition switch turned ON.

*0 – 0.6 V

↑↓

10 – 14 V

(“Reference 

waveform No.1: ” and 
“Reference waveform 

No.3: ”)

Engine running at idle 
after warmed up engine.

Output signal is active low 
pulse. Pulse frequency 
varies depending on 
engine speed.

C37-3

YEL/
GRN

EGR valve 
(stepper motor coil 
3)

10 – 14 V

Ignition switch turned ON.

*0 – 1 V

↑↓

10 – 14 V

(“Reference 

waveform No.4: ”)

Ignition switch is turned to 
ST (cranking) position.

Output signal is active low 
duty pulse. Number of 
pulse generated times 
varies depending on 
vehicle condition.

C37-4

YEL

EGR valve 
(stepper motor coil 
4)

10 – 14 V

Ignition switch turned ON.

*0 – 1 V

↑↓

10 – 14 V

(“Reference 

waveform No.4: ”)

Ignition switch is turned to 
ST (cranking) position.

Output signal is active low 
duty pulse. Number of 
pulse generated times 
varies depending on 
vehicle condition.

C37-5

YEL/

BLK

EGR valve 
(stepper motor coil 
1)

10 – 14 V

Ignition switch turned ON.

*0 – 1 V

↑↓

10 – 14 V

(“Reference 

waveform No.4: ”)

Ignition switch is turned to 
ST (cranking) position.

Output signal is active low 
duty pulse. Number of 
pulse generated times 
varies depending on 
vehicle condition.

C37-6

YEL/

RED

EGR valve 
(stepper motor coil 
2)

10 – 14 V

Ignition switch turned ON.

*0 – 1 V

↑↓

10 – 14 V

(“Reference 

waveform No.4: ”)

Ignition switch is turned to 
ST (cranking) position.

Output signal is active low 
duty pulse. Number of 
pulse generated times 
varies depending on 
vehicle condition.

C37-7

BLU/
ORN

Power steering 
pump pressure 
switch signal

10 – 14 V

Ignition switch turned ON.

0 – 1 V

With engine at idle speed, 
turning steering wheel to 
the right or left as far as it 
stops.

C37-8

BRN/

RED 

(for M16 

engine)

BRN/

BLK (for 

J20 

engine)

Generator field coil 
monitor signal

10 – 14 V

Ignition switch turned ON.

Signal is duty pulse. Duty 
ratio varies depending on 
vehicle condition.

*0 – 1 V

↑↓

10 – 14 V

(“Reference 

waveform No.5: ” and 
“Reference waveform 

No.6: ”)

Engine running at idle 
after warmed up engine.

1A-50 Engine General Information and Diagnosis: 

C37-9

BLU

Electric load 
current sensor 
signal (for J20 
engine)

0.5 – 1.0 V

Ignition switch turned ON.

1.3 – 1.7 V

Run engine at 2000 rpm, 
headlight switch turned 
ON.

1.8 – 2.4 V

Run engine at 2000 rpm, 
headlight switch ON and 
blower selector at HI 
position.

C37-10

GRN/

WHT

CO adjusting 
resistor signal (for 
J20 engine, if 
equipped)

0 – 5 V

Ignition switch turned ON.

C37-11

RED

Oxygen signal of 
heated oxygen 
sensor-2

4 – 5 V

Ignition switch turned ON.

*Approx. 0.15 V

(“Reference 

waveform No.7: ” and 
“Reference waveform 

No.8: ”)

Engine running at idle 
after warmed up engine.

C37-12

GRY/

BLK

A/C refrigerant 
pressure sensor 
signal (if equipped 
with A/C)

1.38 – 1.52 V

Engine running, A/C 
switch OFF and blower 
selector at OFF position, 
A/C refrigerant pressure: 
800 kPa (116 psi)

2.15 – 2.38 V

Engine running, A/C 
switch ON and blower 
selector at 1st position or 
more, A/C refrigerant 
pressure: 1400 kPa (203 
psi)

2.67 – 2.95 V

Engine running, A/C 
switch ON and blower 
selector at 1st position or 
more, A/C refrigerant 
pressure: 1800 kPa (261 
psi)

C37-13

GRN/

BLK

EVAP canister 
purge valve output

10 – 14 V

Ignition switch turned ON 
with engine at stop.

*0 – 0.6 V

↑↓

10 – 14 V

(“Reference 

waveform No.9: ”)

Set EVAP canister purge 
valve at 52% by using 
“Misc Test” of scan tool.

Output signal is active low 
duty pulse. Duty ratio 
varies depending on 
vehicle condition.

C37-14

GRY/

RED

Output of 5 V 
power source for 
MAP sensor, A/C 
refrigerant 
pressure sensor, 
electric load 
current sensor (for 
J20 engine) and 
CO adjusting 
resistor (if 
equipped)

4.5 – 5.5 V

Ignition switch turned ON.

C37-15

BLK/
ORN

Ground for ECM

Below 0.3 V

Ignition switch turned ON.

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks

Engine General Information and Diagnosis:  1A-51

C37-16

PNK/

GRN

Fuel injector No.3

10 – 14 V

Ignition switch turned ON.

*0 – 0.6 V

↑↓

10 – 14 V

(“Reference 

waveform No.1: ” and 
“Reference waveform 

No.10: ”)

Engine running at idle 
after warmed up engine.

Output signal is active low 
pulse. Pulse frequency 
varies depending on 
engine speed.

C37-17

PNK/

BLU

Fuel injector No.4

10 – 14 V

Ignition switch turned ON.

*0 – 0.6 V

↑↓

10 – 14 V

(“Reference 

waveform No.1: ” and 
“Reference waveform 

No.11: ”)

Engine running at idle 
after warmed up engine.

Output signal is active low 
pulse. Pulse frequency 
varies depending on 
engine speed.

C37-18

BRN/

YEL

Ignition coil No.4 
(for J20 engine)

0 – 0.6 V

Ignition switch turned ON.

*0 – 0.6 V

↑↓

3 – 5 V

(“Reference 

waveform No.12: ” 

and “Reference 

waveform No.13: ”)

Engine running at idle 
after warmed up engine.

Output signal is active 
high pulse. Pulse 
frequency varies 
depending on engine 
speed.

C37-19

BRN/

WHT

Ignition coil No.3 
(for J20 engine)

0 – 0.6 V

Ignition switch turned ON.

*0 – 0.6 V

↑↓

3 – 5 V

(“Reference 

waveform No.12: ” 

and “Reference 

waveform No.14: ”)

Engine running at idle 
after warmed up engine.

Output signal is active 
high pulse. Pulse 
frequency varies 
depending on engine 
speed.

C37-20

BRN/

BLK

Ignition coil No.2 
and No.3 (for M16 
engine)

0 – 0.6 V

Ignition switch turned ON.

Ignition coil No.2 
(for J20 engine)

*0 – 0.6 V

↑↓

3 – 5 V

(“Reference 

waveform No.12: ” 

and “Reference 

waveform No.15: ”)

Engine running at idle 
after warmed up engine.

Output signal is active 
high pulse. Pulse 
frequency varies 
depending on engine 
speed.

C37-21

BRN

Ignition coil No.1 
and No.4 (for M16 
engine)

0 – 0.6 V

Ignition switch turned ON.

Ignition coil No.1 
(for J20 engine)

*0 – 0.6 V

↑↓

3 – 5 V

(“Reference 

waveform No.12: ” 

and “Reference 

waveform No.16: ”)

Engine running at idle 
after warmed up engine.

Output signal is active 
high pulse. Pulse 
frequency varies 
depending on engine 
speed.

C37-22

BLK/

YEL

Starting motor 
control relay output

0 – 1 V

Ignition switch turned ON.

8 – 14 V

Ignition switch turned to 
ST (engine cranking) 
position.

C37-23

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks

 

 

 

 

 

 

 

Content   ..  11  12  13  14   ..