Suzuki Grand Vitara JB416 / JB420 (ESP model). Manual - part 14

1A-52 Engine General Information and Diagnosis: 

C37-24

PPL/

YEL

Engine coolant 
temp. (ECT) 
sensor signal

3.3 – 3.8 V

Ignition switch turned ON, 
ECT at 0 

°C, 32 °F.

—

1.38 – 1.72 V

Ignition switch turned ON, 
ECT at 50 

°C, 122 °F.

0.40 – 0.53 V

Ignition switch turned ON, 
ECT at 100 

°C, 212 °F.

C37-25 LT GRN

Intake air temp. 
(IAT) sensor signal

3.18 – 3.67 V

Ignition switch turned ON, 
IAT at 0 

°C, 32 °F.

—

1.32 – 1.65 V

Ignition switch turned ON, 
IAT at 40 

°C, 104 °F.

0.46 – 0.60 V

Ignition switch turned ON, 
IAT at 80 

°C, 176 °F.

C37-26

RED

Mass air flow 
(MAF) sensor 
signal

0.5 – 1.0 V

Ignition switch turned ON 
with engine at stop.

—

1.3 – 1.8 V

(“Reference 

waveform No.17: ”)

When engine running at 
specified idle speed after 
warmed up.

C37-27

BLU

Ground for MAF 
sensor

Below 0.3 V

Ignition switch turned ON.

—

C37-28

BRN/

BLK

Generator control 
signal output

*0 – 0.6 V

↑↓

5 – 7 V

(“Reference 

waveform No.5: ” and 
“Reference waveform 

No.6: ”)

Engine running at idle 
speed, headlight switch 
turned ON.

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

C37-29

BLK/

YEL

Ground for ECM

Below 0.3 V

Ignition switch turned ON.

—

C37-30

BLK/
ORN

Ground for ECM

Below 0.3 V

Ignition switch turned ON.

—

C37-31

BLK/

YEL

Ground for A/F 
sensor heater

Below 0.3 V

Ignition switch turned ON.

—

C37-32

PNK/

BLU

Heater output of A/
F sensor

10 – 14 V

Ignition switch turned ON.

—

*0 – 1 V

↑↓

10 – 14 V

(“Reference 

waveform No.18: ”)

Engine running at idle 
after warmed up engine.

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

C37-33

GRY/

RED

Intake manifold 
tuning vacuum 
solenoid valve 
output (for J20 
engine)

10 – 14 V

Ignition switch turned ON.

—

0 – 1 V

(“Reference 

waveform No.19: ”)

Engine running at idle 
after warmed up engine.

C37-34

RED/

BLU

Ground for A/F 
sensor adjusting 
resistor

Below 0.3 V

Ignition switch turned ON.

—

C37-35

RED/

YEL

A/F sensor 
adjusting resistor 
signal

0.15 – 4.82 V

Ignition switch turned ON.

—

C37-36

PNK

Crankshaft position 
(CKP) sensor (–)
(for J20 engine)

0 – 1 V

Ignition switch turned ON.

—

*4 – 6 V

↑↓

–4 – –6 V

(“Reference 

waveform No.20: ” 

and “Reference 

waveform No.21: ”)

Engine running at idle 
after warmed up engine.

Output signal is sinusoidal 
waveform.
Waveform frequency 
varies depending on 
engine speed. (30 (36 – 6) 
pulses are generated par 
1 crankshaft revolution.)

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks

Engine General Information and Diagnosis:  1A-53

C37-37

BLK

A/F sensor signal 
(–)

2.6 – 2.8 V

(“Reference 

waveform No.18: ”)

Engine running at idle 
after warmed up engine.

—

C37-38

WHT

A/F sensor signal 
(+)

3.0 – 3.2 V

(“Reference 

waveform No.18: ”)

Engine running at idle 
after warmed up engine.

—

C37-39

—

—

—

—

—

C37-40

RED

Throttle position 
sensor (sub) signal

1.60 – 1.91 V

Ignition switch turned ON 
and accelerator pedal at 
idle position after warmed 
up engine.

—

3.88 – 4.45 V

Ignition switch turned ON 
and accelerator pedal at 
full depressed position 
after warmed up engine.

C37-41

GRN

Ground for throttle 
position sensor

Below 0.3 V

Ignition switch turned ON.

—

C37-42

—

—

—

—

—

C37-43

—

—

—

—

—

C37-44

BLU/

RED

Output of throttle 
actuator

0 – 1 V

Ignition switch turned ON 
and accelerator pedal at 
idle position after warmed 
up engine.

Output signal is duty 
pulse. Duty ratio varies 
depending on throttle 
valve and accelerator 
pedal position.

*0 – 1 V

↑↓

10 – 14 V

(“Reference 

waveform No.22: ” 

and “Reference 

waveform No.23: ”)

Ignition switch turned ON 
and accelerator pedal at 
full depressed position 
after warmed up engine.

C37-45

BLU/

YEL

Output of throttle 
actuator

0 – 1 V

Ignition switch turned ON 
and accelerator pedal at 
full depressed position 
after warmed up engine.

Output signal is duty 
pulse. Duty ratio varies 
depending on throttle 
valve and accelerator 
pedal position.

*0 – 1 V

↑↓

10 – 14 V

(“Reference 

waveform No.22: ” 

and “Reference 

waveform No.23: ”)

Ignition switch turned ON 
and accelerator pedal at 
idle position after warmed 
up engine.

C37-46

—

—

—

—

—

C37-47

BLK/

RED

Heater output of 
heated oxygen 
sensor-2

10 – 14 V

Ignition switch turned ON.

—

*0 – 1 V

↑↓

10 – 14 V

(“Reference 

waveform No.7: ” and 
“Reference waveform 

No.8: ”)

Engine running at idle 
after warmed up engine.

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

C37-48

BLK/

YEL

Ground for ECM

Below 0.3 V

Ignition switch turned ON.

—

C37-49

—

—

—

—

—

C37-50

—

—

—

—

—

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks

1A-54 Engine General Information and Diagnosis: 

C37-51

WHT/

BLU

CKP sensor signal 
(for M16 engine)

0 – 1 V or 4 – 5 V

Ignition switch turned ON.

—

*4 – 5 V

↑↓

0 – 0.6 V

(“Reference 

waveform No.20: ” 

and “Reference 

waveform No.21: ”)

Engine running at idle 
after warmed up engine.

Sensor signal is pulse. 
Pulse frequency which 
varies depending on 
engine speed.
(30 (36 – 6) pulses are 
generated per 1 
crankshaft revolution.)

GRN

Crankshaft position 
(CKP) sensor (+) 
(for J20 engine)

0 – 1 V

Ignition switch turned ON.

—

*4 – 6 V

↑↓

–4 – –6 V

(“Reference 

waveform No.20: ” 

and “Reference 

waveform No.21: ”)

Engine running at idle 
after warmed up engine.

Output signal is sinusoidal 
waveform.
Waveform frequency 
varies depending on 
engine speed. (30 (36 – 6) 
pulses are generated par 
1 crankshaft revolution.)

C37-52

WHT/

RED

CMP sensor signal

0 – 1 V or 4 – 5 V

Ignition switch turned ON.

—

*0 – 0.6 V

↑↓

4 – 5 V

(“Reference 

waveform No.20: ” 

and “Reference 

waveform No.21: ”)

Engine running at idle 
after warmed up engine.

Sensor signal is pulse. 
Pulse frequency varies 
depending on engine 
speed.
(6 pulses are generated 
per 1 camshaft revolution.)

C37-53

WHT

Output for 5 V 
power source of 
throttle position 
sensor

4.5 – 5.5 V

Ignition switch turned ON.

—

C37-54

BLK

Throttle position 
sensor (main) 
signal

0.72 – 1.04 V

Ignition switch turned ON 
and accelerator pedal at 
idle position after warmed 
up engine.

—

3.67 – 4.25 V

Ignition switch turned ON 
and accelerator pedal at 
full depressed position 
after warmed up engine.

C37-55

RED/

WHT

Manifold absolute 
pressure (MAP) 
sensor signal

Approx. 4 V
(“Reference 

waveform No.24: ”

Ignition switch turned ON 
with barometric pressure 
at 100 kPa, 760 mmHg.

—

0.4 – 2.0 V

(“Reference 

waveform No.25: ”

While engine running at 
specified idle speed after 
warmed up with 
barometric pressure at 
100 kPa, 760 mmHg.

C37-56

WHT

Knock sensor 
signal

2 – 3 V

(“Reference 

waveform No.26: ” 

and “Reference 

waveform No.27: ”)

Ignition switch turned ON.

—

Engine running at 4000 r/
min. after warmed up.

C37-57

GRY/

GRN

Ground for sensors

Below 0.3 V

Ignition switch turned ON.

—

C37-58

BLK/

YEL

Ground for ECM

Below 0.3 V

Ignition switch turned ON.

—

C37-59

BRN/

YEL

Oil control valve 
ground (for M16 
engine)

Below 1.3 V

Ignition switch turned ON.

—

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks

Engine General Information and Diagnosis:  1A-55

C37-60

BRN/

WHT

Oil control valve 
output (for M16 
engine)

*0 – 0.6 V

↑↓

10 – 14 V

(“Reference 

waveform No.28: ” 

and “Reference 

waveform No.29: ”)

At the moment of ignition 
switch turned ON.

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

E23-1

BLU/

BLK

Main power supply

10 – 14 V

Ignition switch turned ON.

—

E23-2

WHT

Power source for 
ECM internal 
memory

10 – 14 V

Ignition switch turned ON.

—

E23-3

—

—

—

—

—

E23-4

WHT/

RED

CAN (high) 
communication line 
(active high signal)

*2.5 – 4.5 V
(“Reference 

waveform No.30: ”)

Ignition switch turned ON 
with engine at stop.

CAN communication line 
signal is pulse. Pulse 
signal displayed with a 
regular frequency which 
varies depending on 
engine condition.

E23-5

PPL/

WHT

Serial 
communication line 
of data link 
connector 12 V

8 – 14 V

Ignition switch turned ON.

—

E23-6

BLK/

WHT

Cruise control main 
switch signal (if 
equipped with 
cruise control 
system)

10 – 14 V

Ignition switch turned ON, 
cruise control main switch 
to ON position. (cruise 
control main switch is kept 
in push)

—

E23-7

BLU

Clutch pedal 
position switch 
signal (for M/T 
model, if equipped 
with cruise control 
system)

4 – 6 V

Ignition switch turned ON, 
clutch pedal not 
depressed.

—

0 – 1 V

Ignition switch turned ON, 
clutch pedal full 
depressed.

E23-8

YEL/
GRN

Brake pedal 
position switch 
signal (if equipped 
with cruise control 
system)

10 – 14 V

Ignition switch turned ON, 
stop lamp not lit up.

—

0 – 1 V

Ignition switch turned ON, 
stop lamp lit up.

E23-9

—

—

—

—

—

E23-10

—

—

—

—

—

E23-11

—

—

—

—

—

E23-12

YEL

Diagnosis switch 
terminal (if 
equipped)

4 – 5 V

Ignition switch turned ON.

—

E23-13

PNK/

BLU

Clock signal for 
immobilizer coil 
antenna (if 
equipped)

10 – 14 V

Ignition switch turned ON.

—

E23-14

—

—

—

—

—

E23-15

WHT/

GRN

Fuel pump relay 
output

0 – 2.5 V

For 2 sec. from the time 
ignition switch is turned 
ON or while engine is 
running.

—

10 – 14 V

On and after 2 sec. from 
the time ignition switch is 
turned ON or while engine 
is at stop.

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks