Suzuki GRAND VITARA JB416, Service Manual

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1A-60 Engine General Information and Diagnosis:
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