User Manual

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 In other cases, the LCD only indicates the resistance value.

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.