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Visual Inspection

(1)

Check that MAFS is damaged, contaminated or deformed.

(2)

Has a problem been found ?

YES

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

▶ Go to "Check MAFS" as follows

Check MAFS

(1)

IG "OFF" and install a scantool

(2)

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

(3)

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.)

(4)

Are both service data and signalwave form dispayed correctly ?

YES

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

caution

There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM.

Before or after testing PCM on the vehicle, use this function to reuse the PCM 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.