Check that MAFS is damaged, contaminated or deformed.

Check tha air cleaner is clogged.

Has a problem been found ?

YES

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

NO

▶ Go to "Check MAFS" as follows

IG "OFF" and install a scantool

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

Monitor signal waveform at terminal 1 of MAFS with scantool.

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

Are both service data and signalwave form dispayed correctly ?

YES

▶ Go to "Verification of Vehicle Repair" procedure.

NO

▶ 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.