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1.

IG key OFF.

2.

Place the probe of oscilloscope with 'GLOW PLUG #' terminal of 'GLOW PLUG #' harness connector.

3.

IG key ON, and monitor the signal waveform at 'GLOW PLUG #' terminal of 'GLOW PLUG #' harness connector.(Or connect GDS with 'DATA LINK CONNECTOR'(DLC) and perform actuation test -"GLOW RELAY" with GDS.)

Reference signal waveform

Fig.1) Signal waveform of glow plug before and after starting at 30℃ engine coolant temperature with IG key operation.(IG key OFF to Cranking)

Fig. 2) Signal waveform of glow plug at Idle status.

☞ 1~ 2sec. after IG key ON, operating duty for glow plug reaches approx. 100%. After that, PWM is controlled corresponding engine condition.(Approx. 30 ~ 32Hz)

4.

Is the signal waveform normal?

	▶ Go to "Verification of Vehicle Repair" procedure.
	▶ Replace GCU, and go to "Verification of Vehicle Repair" procedure.