Diamante Sedan V6-2972cc 3.0L DOHC (1993)
Normal Wave Forms
Abnormal Waveform
Frequency Testing Procedures
1. Warm engine. Coolant temperature should be at: 85-95°C (185-205°F), with no electrical accessory loads on. Connect a Frequency counter
(HERTZ counter) between terminal 5 and 3 (do not remove the connector, instead insert a straight pin or needle from the back side of the
connector) of the Air Flow Sensor (AFS) connector.
Terminal 5: Sensor ground
Terminal 3: AFS output
2. Measure the frequency across terminals 5 and 3.
Standard Values
25 to 50 Hz at 750 rpm
70 to 100 Hz at 2,000 rpm
Frequency increases as RPM increases
