Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 72

1A-235 Engine General Information and Diagnosis: For Petrol Engine Model

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

Reference waveform No.13
Ignition coil No.4 signal (2) with engine idling (J20A 
engine)

Reference waveform No.14
Ignition coil No.3 signal (2) with engine idling (J20A 
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]: J20A engine
[B]: M16A 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

Engine General Information and Diagnosis: For Petrol Engine Model 1A-236

Reference waveform No.15
• Ignition coil No.2 signal (1) with engine idling (J20A 

engine)

• Ignition coil No.2 and No.3 signal (2) with engine idling 

(M16A engine)

Reference waveform No.16
• Ignition coil No.1 signal (1) with engine idling (J20A 

engine)

• Ignition coil No.1 and No.4 signal (2) with engine idling 

(M16A engine)

Measurement 
terminal

CH1: “C37-52” to “C37-58”
CH2: “C37-20” 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

[A]: J20A engine
[B]: M16A engine

3. Cylinder reference signal (CMP reference signal)
4. 720

° crank angle

I5JB0A110086-01

Measurement 
terminal

CH1: “C37-52” to “C37-58”
CH2: “C37-21” 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

[A]: J20A engine
[B]: M16A engine

3. Cylinder reference signal (CMP reference signal)
4. 720

° crank angle

I5JB0A110087-02

1A-237 Engine General Information and Diagnosis: For Petrol Engine Model

Reference waveform No.17
Mass air flow sensor signal (1) with engine racing

Reference waveform No.18
A/F sensor signal with engine idling

Reference waveform No.19
Intake manifold tuning vacuum solenoid valve signal with 
engine racing (J20A engine)

Measurement 
terminal

CH1: “C37-26” to “C37-27”
CH2: “C37-54” to “C37-41”

Oscilloscope 
setting

CH1: 1 V/DIV, CH2: 1 V/DIV
TIME: 200 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine racing

2. Throttle position sensor (main) signal
3. Racing
4. Idle

Measurement 
terminal

CH1: “C37-38” to “C37-58”
CH2: “C37-37” to “C37-58”
CH3: “C37-32” to “C37-31”

Oscilloscope 
setting

CH1: 500 mV/DIV, CH2: 500 mV/
DIV, CH3: 10 V/DIV
TIME: 100 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed

1. A/F sensor signal (+)
2. A/F sensor signal (–)
3. A/F sensor heater signal
4. One duty cycle

I5JB0A110088-02

I5JB0A110089-01

Measurement 
terminal

CH1: “C37-33” to “C37-58”
CH2: “C37-54” to “C37-41”

Oscilloscope 
setting

CH1: 10 V/DIV, CH2: 2 V/DIV
TIME: 200 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine racing

1. ON signal (IMT valve closed)
2. OFF signal (IMT valve opened)
3. Throttle position sensor (main) signal
4. Racing

I5JB0A110090-02

Engine General Information and Diagnosis: For Petrol Engine Model 1A-238

Reference waveform No.20
CMP sensor signal with engine idling

Reference waveform No.21
CMP sensor signal with engine idling

Measurement 
terminal

CH1: “C37-52” to “C37-58”
CH2: “C37-51” to “C37-36” (J20A 
engine), “C37-58” (M16A engine)

Oscilloscope 
setting

CH1: 2 V/DIV, CH2: 2 V/DIV
TIME: 20 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed

[A]: J20A engine
[B]: M16A engine

1. Cylinder reference signal (CMP reference signal)
2. CKP signal
3. 360

° crank angle

4. 4 – 5 V
5. 36 – 6 = 30 CKP pulse

I5JB0A110091-01

Measurement 
terminal

CH1: “C37-52” to “C37-58”
CH2: “C37-51” to “C37-36” (J20A 
engine), “C37-58” (M16A engine)

Oscilloscope 
setting

CH1: 2 V/DIV, CH2: 2 V/DIV
TIME: 10 ms/DIV

Measurement 
condition

• After warmed up to normal 

operating temperature

• Engine at specified idle speed

[A]: J20A engine
[B]: M16A engine

1. Cylinder reference signal (CMP reference signal)
2. CKP signal
3. 30

° crank angle

4. 10

° crank angle

5. 360

° crank angle

6. 36 – 6 = 30 CKP pulse

I5JB0A110092-02