Visual Inspection
Check the air hose between MAFS and throttle body is torn or installation.
Check deforamtion, crack or installation of throttle valve(body)
Has a problem been found ?
YES
Substitute with a known-good Air hose or throttle body and check for proper operation.
If the problem is corrected,replace air hose or throttle body and then go to "Verification of Vehicle Repair" procedure.
NO
Go to "Check MAFS" as follows.
Check MAFS
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.
