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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-975 INSPECTION PROCEDURE USING AN M1131154500640 VOLUME AIRFLOW SENSOR Required Special Tool: • MB991709: Test Harness . Measurement Method connect the test harness special tool (MB991709) in 2. Connect the oscilloscope probe to volume airflow sensor connector terminal No. 3. . Alternate method (Test harness not available) Observation condition Function Special pattern Pattern height Low Pattern selector Display Engine r/min Idle speed Observation condition Rev engine, observe T1 and T2 remain equal. AK102975AC 1 2 3 4 5 6 7 VOLUME AIRFLOW OSCILLOSCOPE MB991709 AKX01595 THE TIME (CYCLE TIME) T IS REDUCED WHEN THE TIMES T 1 AND T 2 ARE EQUAL T T 1 T 2 10 0 (V) TIME AB Standard wave pattern |