Operation CHARM
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Mazda
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2006
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5 L4-2.3L
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Repair and Diagnosis
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Engine, Cooling and Exhaust
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Cooling System
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Radiator Cooling Fan
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Testing and Inspection
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Oscilloscope Patterns and Waveforms
Oscilloscope Patterns and Waveforms
Cooling fan control signals
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PCM terminals: 1W(+)-body ground (-)
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Oscilloscope setting:
5 V
/DIV (Y),
1 minute
/DIV (X), DC range
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Vehicle condition: Idle after warm up (engine speed approx.
700 rpm
, A/C ON)