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Trouble Godes - diagramas.diagram...

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Fig. 18<br />

Fig. 20<br />

Fig. 19<br />

Oscilloscope testing I<br />

EvapMstive ~mlsslon (EVAP) can- purge valve<br />

Fig. 21<br />

Serial data - amplitude, frequency, shape, pulse width and pattern<br />

Serial data signals will be generated by the engine control module (ECM), if it has a self-diagnosis facility - Fig. 21.<br />

By noting the pulse width, pattern and frequency, the short pulses can be counted in groups and interpreted a souble<br />

code, in this case 1223.<br />

The amplitude and shape remain constant and the pattern will be repeated until the trouble code has been erased.

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