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11
If the resistance value is greater than 200kΩ , the LCD will
show “0L”.
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
Once you extract a DTC from the vehicle and realize that
troubleshooting 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:
Set the tool in AC Voltage mode, using the probe tip with
chassis ground or the auxiliary ground lead.
Connect vacuum pump to MAP 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.
Apply vacuum.
Release vacuum and observe the LCD readings.（Figure 10）
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