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1.

Check for damage or contamination to the MAF.

2.

Check for restriction in the air filter.

3.

Has a problem been found ?

	▶ Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Check MAFS" as follows.

4.

IG "OFF" and install a scantool.

5.

ENG "ON" and monitor "MAFS" data on the service data.

6.

Monitor signal waveform at signal terminal of MAFS with scantool.

Specification : Signal waveform will be displayed as follows. Frenquency will be increased during acceleration.(Be aware that the signal of MAFS is not voltage display but frequency display.)

Fig.1) Normal waveform of MAFS at idle.(600rpm & 11kg/h)

Fig.2) Normal waveform of MAFS at acceleration.(2080rpm & 34kg/h)

7.

Are both service data and signal waveform dispayed correctly ?

	▶ 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. note There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by ECM. Before or after testing ECM on the vehicle, use this function to reuse the ECM on the others.
	▶ Substitute with a known - good MAFS and check for proper operation. If the problem is corrected, replace MAFS and go to "Verification of Vehicle Repair" procedure.