Actron SunPro CP7678 - Page 35

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• Display reading should...
- increase in
voltage from Key On En-
gine OFF for DC type MAF sensors.
- increase in
RPM from Key On Engine
OFF for Low Frequency type MAF sen-
sors.
• Rev Engine.
• Display reading should...
- increase in
voltage from Idle for DC
type MAF sensors.
- increase in
RPM from Idle for Low Fre-
quency 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 specifi-
cations 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.