Actron Digital Multimeter CP7676 - Manual (Page 35)

35
8. Operate Sensor.
• Start engine and let idle.
• Display reading should...
– increase in voltage from Key On
Engine OFF for DC type MAF sensors.
– increase in RPM from Key On Engine
OFF for Low Frequency type MAF
sensors.
• Rev Engine.
• Display reading should...
– increase in voltage from Idle for DC
type MAF sensors.
– increase in RPM from Idle for Low
Frequency type MAF sensors.
• Refer to vehicle service manual for
charts relating MAF sensor voltage or
frequency(RPM) to increasing air flow.
• Use equation above for Frequency and
RPM conversions.
9. Test Results.
Good Sensor:
• Sensor output voltage or frequency
(RPM) are within manufacturers
specifications at Key ON Engine OFF.
• Sensor output voltage or frequency
(RPM) increase with increasing air flow.
Bad Sensor:
• Sensor output voltage or frequency
(RPM) are not within manufacturers
specifications at Key ON Engine OFF.
• Sensor output voltage or frequency
(RPM) do not change with increasing air
flow.
Electrical Specifications
DC Volts
Range: 2V, 20V, 200V
Accuracy : ±(1.0% rdg + 2 dgts)
AC Volts
Range: 750V
Accuracy: ±(0.75% rdg + 2 dgts)
Resistance
Range:
200 Ω , 2K Ω , 20K Ω , 200K Ω , 2M Ω , 20M Ω
Accuracy: ±(0.75% rdg + 2 dgts)
Dwell
Range: 4CYL, 5CYL, 6CYL, 8CYL
Accuracy: ±(3.0% rdg + 5 dgts)
RPM
Range: 4CYL, 5CYL, 6CYL, 8CYL
Accuracy: ±(3.0% rdg + 5 dgts)