Ω
?
max
min
12.3V
0.3V
Hz
freq
42.9k
19
Once you extract a DTC from the vehicle and realize that trouble
-
shooting begins with some kind of sensor circuit, there is a quick
test you can perform to verify the code. Testing your sensor is easy
while using the tool.
For example, you suspect there is a problem with your M.A.P. ? sensor
circuit, then follow the procedure involved with testing this sensor:
There is also another way to prove continuity of connections to
ground or battery. Power up the connection using the power switch.
If the circuit breaker trips you know that you have a good solid
low resistance connection.
NOTE:
You can use the probe tip to pierce the plastic insulation on
a wire. This means that you can test the circuit without disconnecting
anything.
3.3 Signal Circuit Testing
Set the tool in AC Voltage mode, using the probe tip with chassis
ground or the auxiliary ground lead.
Apply vacuum.
Connect vacuum pump to MAP sensor.
Release vacuum and observe the LCD readings.
（
Figure 11
）
If the LCD readings are abnormal, there is a problem with this
sensor.
Contact the probe tip to the MAP sensor positive terminal and
observe the LCD readings which should be a sine wave in normal
condition.
Figure 11
