Suzuki SX4 Service Manual page 238

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1A-188 Engine General Information and Diagnosis:
Reference waveform No.15
Mass air flow sensor signal (1) with engine racing
Measurement
CH1: "C01-26" to "C01-27"
terminal
CH2: "C01-54" to "C01-55"
Oscilloscope
CH1: 1 V/DIV, CH2: 1 V/DIV
setting
TIME: 200 ms/DIV
• After warmed up to normal
Measurement
operating temperature
condition
• Engine racing
2. Throttle position sensor signal
3. Racing
Reference waveform No.16
EVAP canister purge valve signal
Measurement
CH1: "C01-29" to "C01-58"
terminal
Oscilloscope
CH1: 10 V/DIV
setting
TIME: 40 ms/DIV
• After warmed up to normal
operating temperature
Measurement
• EVAP canister purge valve setting
condition
at 52% by using "Engine / Active
Test" of scan tool.
1. ON signal
2. OFF signal
I4RS0B110066-01
4. Idle
I4RS0B110067-01
3. One duty cycle
4. 10 – 14 V
Reference waveform No.17
Manifold absolute pressure sensor signal (1) with
ignition switch turned ON
Measurement
CH1: "C01-53" to "C01-55"
terminal
CH2: "C01-54" to "C01-55"
Oscilloscope
CH1: 2 V/DIV, CH2: 1 V/DIV
setting
TIME: 200 ms/DIV
• After warmed up to normal
Measurement
operating temperature
condition
• Ignition switch turned ON
2. Throttle position sensor signal
Reference waveform No.18
Manifold absolute pressure sensor signal (1) with engine
racing
Measurement
CH1: "C01-53" to "C01-55"
terminal
CH2: "C01-54" to "C01-55"
Oscilloscope
CH1: 2 V/DIV, CH2: 2 V/DIV
setting
TIME: 200 ms/DIV
• After warmed up to normal
Measurement
operating temperature
condition
• Engine racing
2. Throttle position sensor signal
3. Racing
I4RS0B110070-01
I4RS0B110071-01
4. Idle

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