Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 69

1A-223 Engine General Information and Diagnosis: For Petrol Engine Model

C37-14

GRY/

RED

Output of 5 V 
power source for 
MAP sensor, A/C 
refrigerant 
pressure sensor, 
electric load 
current sensor 
(J20A 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.

—

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: For 

Petrol Engine Model” 

and “Reference 

waveform No.10: For 

Petrol Engine Model”)

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: For 

Petrol Engine Model” 

and “Reference 

waveform No.11: For 

Petrol Engine Model”)

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 
(J20A engine)

0 – 0.6 V

Ignition switch turned ON.

—

*0 – 0.6 V

↑↓

3 – 5 V

(“Reference 

waveform No.12: For 
Petrol Engine Model” 

and “Reference 

waveform No.13: For 

Petrol Engine Model”)

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 
(J20A engine)

0 – 0.6 V

Ignition switch turned ON.

—

*0 – 0.6 V

↑↓

3 – 5 V

(“Reference 

waveform No.12: For 
Petrol Engine Model” 

and “Reference 

waveform No.14: For 

Petrol Engine Model”)

Engine running at idle 
after warmed up engine.

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

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks

Engine General Information and Diagnosis: For Petrol Engine Model 1A-224

C37-20

BRN/

BLK

Ignition coil No.2 
and No.3 (M16A 
engine)

0 – 0.6 V

Ignition switch turned ON.

—

Ignition coil No.2 
(J20A engine)

*0 – 0.6 V

↑↓

3 – 5 V

(“Reference 

waveform No.12: For 
Petrol Engine Model” 

and “Reference 

waveform No.15: For 

Petrol Engine Model”)

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 (M16A 
engine)

0 – 0.6 V

Ignition switch turned ON.

—

Ignition coil No.1 
(J20A engine)

*0 – 0.6 V

↑↓

3 – 5 V

(“Reference 

waveform No.12: For 
Petrol Engine Model” 

and “Reference 

waveform No.16: For 

Petrol Engine Model”)

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

—

—

—

—

—

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: For 

Petrol Engine Model”)

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: For 

Petrol Engine Model” 

and “Reference 

waveform No.6: For 

Petrol Engine Model”)

Engine running at idle 
speed, headlight switch 
turned ON.

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

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks

1A-225 Engine General Information and Diagnosis: For Petrol Engine Model

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: For 

Petrol Engine Model”)

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 (J20A 
engine)

10 – 14 V

Ignition switch turned ON.

—

0 – 1 V

(“Reference 

waveform No.19: For 

Petrol Engine Model”)

Engine running at idle 
after warmed up engine.

C37-34

RED/

BLU

Ground for A/F 
sensor adjusting 
resistor (J20A 
engine)

Below 0.3 V

Ignition switch turned ON.

—

C37-35

RED/

YEL

A/F sensor 
adjusting resistor 
signal (J20A 
engine)

0.15 – 4.82 V

Ignition switch turned ON.

—

C37-36

PNK

Crankshaft position 
(CKP) sensor (–)
(J20A engine)

0 – 1 V

Ignition switch turned ON.

—

*4 – 6 V

↑↓

–4 – –6 V

(“Reference 

waveform No.20: For 
Petrol Engine Model” 

and “Reference 

waveform No.21: For 

Petrol Engine Model”)

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.)

C37-37

BLK

A/F sensor signal 
(–)

2.6 – 2.8 V

(“Reference 

waveform No.18: For 

Petrol Engine Model”)

Engine running at idle 
after warmed up engine.

—

C37-38

WHT

A/F sensor signal 
(+)

3.0 – 3.2 V

(“Reference 

waveform No.18: For 

Petrol Engine Model”)

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

—

—

—

—

—

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks

Engine General Information and Diagnosis: For Petrol Engine Model 1A-226

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: For 
Petrol Engine Model” 

and “Reference 

waveform No.23: For 

Petrol Engine Model”)

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: For 
Petrol Engine Model” 

and “Reference 

waveform No.23: For 

Petrol Engine Model”)

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: For 

Petrol Engine Model” 

and “Reference 

waveform No.8: For 

Petrol Engine Model”)

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