Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 15

1A-56 Engine General Information and Diagnosis: 

E23-16

BLU/

BLK

Main power supply

10 – 14 V

Ignition switch turned ON.

—

E23-17

GRN

Power supply of 
throttle actuator 
drive circuit

10 – 14 V

Ignition switch turned ON.

—

E23-18

—

—

—

—

—

E23-19

WHT/

BLU

CAN (low) 
communication line 
(active low signal)

*0.5 – 2.5 V
(“Reference 

waveform No.30: ”)

Ignition switch turned ON 
with engine stop.

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

E23-20

GRN/

WHT

Stop lamp switch 
signal

0 – 1 V

Ignition switch turned ON, 
stop lamp not lit up.

—

10 – 14 V

Ignition switch turned ON, 
stop lamp lit up.

E23-21

BLK/

YEL

Cruise control 
command switch 
ground (if equipped 
with cruise control 
system)

Below 1.3 V

Ignition switch turned ON.

—

E23-22 LT GRN

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

4 – 6 V

Ignition switch turned ON.

—

E23-23

—

—

—

—

—

E23-24

YEL/

RED

Fuel level sensor 
signal

0 – 6 V

Ignition switch turned ON.
Voltage varies depends on 
fuel level.

—

E23-25

—

—

—

—

—

E23-26

—

—

—

—

—

E23-27

—

—

—

—

—

E23-28

GRY/

BLU

Serial 
communication line 
for immobilizer coil 
antenna (if 
equipped)

10 – 14 V

Ignition switch turned ON.

—

E23-29

BLK/

WHT

Ignition switch 
signal

0 – 1 V

Ignition switch turned OFF.

—

10 – 14 V

Ignition switch turned ON.

E23-30

—

—

—

—

—

E23-31

—

—

—

—

—

E23-32

—

—

—

—

—

E23-33

—

—

—

—

—

E23-34

—

—

—

—

—

E23-35

—

—

—

—

—

E23-36

—

—

—

—

—

E23-37

—

—

—

—

—

E23-38

—

—

—

—

—

E23-39

—

—

—

—

—

E23-40

—

—

—

—

—

E23-41

—

—

—

—

—

E23-42

—

—

—

—

—

E23-43

—

—

—

—

—

E23-44

—

—

—

—

—

E23-45

—

—

—

—

—

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks

Engine General Information and Diagnosis:  1A-57

E23-46

RED/

BLK

Radiator cooling 
fan relay No.1 
output

10 – 14 V

Ignition switch turned ON, 
engine coolant temp.: 
below 95 

°C (203 °F), or 

A/C refrigerant pressure: 
below 300 kPa (43.5 psi) 
with A/C switch turned on 
while engine is running.

—

0 – 2 V

Ignition switch turned ON, 
engine coolant temp.: 97.5 

°C (207.5 °F) or higher, or 
A/C refrigerant pressure: 
340 kPa (49.3 psi) or 
higher with A/C switch 
turned on while engine is 
running.

E23-47

RED

Radiator cooling 
fan relay No.2 
output

10 – 14 V

Ignition switch turned ON, 
engine coolant temp.: 
below 100 

°C (212 °F), or 

A/C refrigerant pressure: 
below 1300 kPa (188.5 
psi) with A/C switch turned 
on while engine is running.

—

0 – 2 V

Ignition switch turned ON, 
engine coolant temp.: 
102.5 

°C (216.5 °F) or 

higher, or A/C refrigerant 
pressure: 1600 kPa (232 
psi) or higher with A/C 
switch turned on while 
engine is running.

E23-48

RED/

YEL

Radiator cooling 
fan relay No.3 
output

10 – 14 V

Ignition switch turned ON, 
engine coolant temp.: 
below 100 

°C (212 °F), or 

A/C refrigerant pressure: 
below 1300 kPa (188.5 
psi) with A/C switch turned 
on while engine is running.

—

0 – 2 V

Ignition switch turned ON, 
engine coolant temp.: 
102.5 

°C (216.5 °F) or 

higher, or A/C refrigerant 
pressure: 1600 kPa (232 
psi) or higher with A/C 
switch turned on while 
engine is running.

E23-49

PNK

A/C compressor 
relay output (if 
equipped with A/C)

10 – 14 V

Engine running, A/C 
switch OFF and blower 
selector at OFF position.

—

0 – 1 V

Engine running, A/C 
switch ON and blower 
selector at 1st position or 
more.

E23-50

BLU/
ORN

Throttle actuator 
control relay output

0 – 1 V

Ignition switch turned ON.

—

E23-51

BLU/

YEL

Ground for 
accelerator pedal 
position (APP) 
sensor (sub)

Below 0.3 V

Ignition switch turned ON.

—

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks

1A-58 Engine General Information and Diagnosis: 

E23-52

BLU/
GRN

Accelerator pedal 
position (APP) 
sensor (sub) signal

0.30 – 0.44 V

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

—

1.74 – 2.17 V

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

E23-53

ORN/

BLU

Output for 5 V 
power source of 
accelerator pedal 
position (APP) 
sensor (sub)

4.5 – 5.5 V

Ignition switch turned ON.

—

E23-54

ORN

Ground for 
accelerator pedal 
position (APP) 
sensor (main)

Below 0.3 V

Ignition switch turned ON.

—

E23-55

WHT/

BLU

Accelerator pedal 
position (APP) 
sensor (main) 
signal

0.65 – 0.82 V

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

—

3.50 – 4.27 V

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

E23-56

WHT

Output for 5 V 
power source of 
accelerator pedal 
position (APP) 
sensor (main)

4.5 – 5.5 V

Ignition switch turned ON.

—

E23-57

—

—

—

—

—

E23-58

—

—

—

—

—

E23-59

—

—

—

—

—

E23-60

BLU

Main power supply 
relay output

10 – 14 V

Ignition switch turned OFF.

—

0 – 2 V

Ignition switch turned ON.

Terminal 

No.

Wire 

color

Circuit

Normal voltage

Condition

Remarks

Engine General Information and Diagnosis:  1A-59

Reference waveform No.1
Fuel injector signal (1) with engine idling

Reference waveform No.2
No.1 fuel injector signal (2) with engine idling

Reference waveform No.3
No.2 fuel injector signal (2) with engine idling

Reference waveform No.4
EGR valve signal

Measurement 
terminal

CH1: “C37-2” to “C37-58”

Oscilloscope 
setting

CH1: 20 V/DIV
TIME: 1 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed

2. Fuel injection pulse width: 2-4 msec.
3. 10 – 14 V

Measurement 
terminal

CH1: “C37-52” to “C37-58”
CH2: “C37-1” to “C37-58”

Oscilloscope 
setting

CH1: 5 V/DIV, CH2: 20 V/DIV
TIME: 40 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed

1. Cylinder reference signal (CMP reference signal)
3. 720

° crank angle

I5JB0A110074-01

I5JB0A110075-01

Measurement 
terminal

CH1: “C37-52” to “C37-58”
CH2: “C37-2” to “C37-58”

Oscilloscope 
setting

CH1: 5 V/DIV, CH2: 20 V/DIV
TIME: 40 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed

1. Cylinder reference signal (CMP reference signal)
3. 720

° crank angle

Measurement 
terminal

CH1: “C37-5” to “C37-58”
CH2: “C37-6” to “C37-58”
CH3: “C37-3” to “C37-58”
CH4: “C37-4” to “C37-58”

Oscilloscope 
setting

CH1: 20 V/DIV, CH2: 20 V/DIV
CH3: 20 V/DIV, CH4: 20 V/DIV
TIME: 40 ms/DIV

Measurement 
condition

Engine at cranking

1. EGR valve stepper motor coil 1 signal
2. EGR valve stepper motor coil 2 signal
3. EGR valve stepper motor coil 3 signal
4. EGR valve stepper motor coil 4 signal
5. ON signal
6. OFF signal

I5JB0A110076-01

I4RS0B110053-01