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Connect the probe to A/C pressure sensor signal and select the oscilloscope in the menu.

Check the waveform with turning on and off a/c switch after engine start.

Specification : Refer to "Signal Waveform & Data"

Is the measured waveform of A/C pressure sensor normal?

	▶ Substitute with a known - good ECM and check for proper operation. If the problem is corrected, replace ECM and go to "Verification of Vehicle Repair" procedure.
	▶ Substitute with a known - good A/C pressure sensor and check for proper operation. If the problem is corrected, replace A/C pressure sensor and go to "Verification of Vehicle Repair" procedure.