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TROUBLESHOOTING MULTIPORT FUEL INJECTION (MFI) 13A-299 AIR FLOW SENSOR Measurement Method 1. Disconnect the air flow sensor connector, and connect the special tool Test harness (MB991709) 2. Connect the oscilloscope special patterns pickup to air flow sensor connector terminal No. 3. Alternate Method (Test harness not available) to engine-ECU terminal No. 90. Standard Wave Pattern Observation conditions Wave Pattern Observation Points AK000786 4 5 6 1 2 3 7 AE Special Oscilloscope Function Special patterns Pattern height Low Pattern selector Display Engine speed Idle AK202334 (V) 10 T T1 T2 0 Time The time (cycle time) T is reduced when Standard wave pattern Times T1 and T2 are equal. AB AK202335 (V) 10 T 0 Time Observation conditions (from conditions above engine is increased by racing.) AB |