Suzuki Grand Vitara JB416 / JB420. Manual - part 69

1A-225 Engine General Information and Diagnosis: 

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

Engine General Information and Diagnosis:  1A-226

Reference waveform No.5
Generator field coil monitor signal (1) at engine idling

Reference waveform No.6
Generator field coil monitor signal (1) at engine idling

Reference waveform No.7
Heated oxygen sensor-2 signal (1) with engine idling

Reference waveform No.8
Heated oxygen sensor-2 signal (1) with engine racing

Measurement 
terminal

CH1: “C37-8” to “C37-58”
CH2: “C37-28” to “C37-58”

Oscilloscope 
setting

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

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed
• All accessory switch turned off

2. Generator output control signal

Measurement 
terminal

CH1: “C37-8” to “C37-58”
CH2: “C37-28” to “C37-58”

Oscilloscope 
setting

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

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed
• For a few sec. from headlight 

switch turned ON

2. Generator output control signal

I5JB0A110077-01

I5JB0A110078-01

Measurement 
terminal

CH1: “C37-11” to “C37-57”
CH2: “C37-47” to “C37-58”

Oscilloscope 
setting

CH1: 200 mV/DIV, CH2: 10 V/DIV
TIME: 200 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed

2. Heated oxygen sensor-2 heater signal
3. One duty cycle

Measurement 
terminal

CH1: “C37-11” to “C37-57”
CH2: “C37-47” to “C37-58”

Oscilloscope 
setting

CH1: 500 mV/DIV, CH2: 10 V/DIV
TIME: 200 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine racing

2. Heated oxygen sensor-2 heater signal
3. Engine racing

I5JB0A110079-01

I5JB0A110080-03

1A-227 Engine General Information and Diagnosis: 

Reference waveform No.9
EVAP canister purge valve signal

Reference waveform No.10
No.3 fuel injector signal (2) with engine idling

Reference waveform No.11
No.4 fuel injector signal (2) with engine idling

Measurement 
terminal

CH1: “C37-13” to “C37-58”

Oscilloscope 
setting

CH1: 10 V/DIV
TIME: 40 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Set EVAP canister purge valve at 

52% by using “Misc Test” of scan 
tool

1. ON signal
2. OFF signal
3. One duty cycle
4. 10 – 14 V

Measurement 
terminal

CH1: “C37-52” to “C37-58”
CH2: “C37-16” 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

I4RS0B110067-01

I5JB0A110081-01

Measurement 
terminal

CH1: “C37-52” to “C37-58”
CH2: “C37-17” 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

I5JB0A110082-01

Engine General Information and Diagnosis:  1A-228

Reference waveform No.12
Ignition coil signal (1) with engine idling

Reference waveform No.13
Ignition coil No.4 signal (2) with engine idling (for J20 
engine)

Reference waveform No.14
Ignition coil No.3 signal (2) with engine idling (for J20 
engine)

Measurement 
terminal

CH1: “C37-20” to “C37-58”

Oscilloscope 
setting

CH1: 2 V/DIV
TIME: 2 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed

[A]: For J20 engine
[B]: For M16 engine

1. 4 – 6 V
3. Ignition coil pulse width

I5JB0A110083-02

Measurement 
terminal

CH1: “C37-52” to “C37-58”
CH2: “C37-18” to “C37-58”

Oscilloscope 
setting

CH1: 2 V/DIV, CH2: 2 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: “C37-52” to “C37-58”
CH2: “C37-19” to “C37-58”

Oscilloscope 
setting

CH1: 2 V/DIV, CH2: 2 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

I5JB0A110084-01

I5JB0A110085-01