Actron CP7677 Instrucciones de operaciones descargar pdf (Pagina 33)

33

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 Fre-

quency 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 fre-

quency (RPM) to increasing

air flow.

• Use equation above for Fre-

quency and RPM conver-

sions.

Typical GM 1988 & older

Low Frequency type

MAF Sensor

Red

DC

Only

Frequency

Only

Black

Ground

Fig. 35

• 20V range for DC type MAF sen-

sors.

• 4 Cylinder RPM position for Low

Frequency type MAF sensors.

7. View reading on display.

DC Volts Type Sensor:

• Display reading should be approxi-

mately 1V or less depending on

MAF sensor manufacturer.

Low Frequency Type Sensor:

• Display reading should be approxi-

mately 330RPM ± 5% for GM Low

Frequency MAF sensors.

• For other Low Frequency type MAF

sensors refer to vehicle service

manual for MAF sensor specifications.

• It is O.K. if last two display digits

change slightly while Key is ON.

• Remember to multiply display read-

ing by 10 to get actual RPM.

• To convert RPM to Frequency or

vice versa, use equation below.

Frequency =

RPM

30

{Equation Only Valid for Multim-

eter in 4 Cylinder RPM Position}

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 manufactur-

ers specifications at Key ON En-

gine OFF.

• Sensor output voltage or frequency

(RPM) do not change with increas-

ing air flow.

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