Make-And-Break Measurement; Test Example - Launch EM101 Manual

LAUNCH
3. Insert black test pen into COM terminal of EM101N, insert red test pen into V/Ω terminal of EM101N.
4. Attach red test pen to positive end of diode, black test pen to negative end of diode. Keep test pen
firmly attached to diode.
5. Diode forward conduction current will be displayed directly on the diagnostic tool.

4.1.5 Make-and-break Measurement

1. Tap Toolbox -> Multimeter on the diagnostic tool to enter.
2. Select On/Off, tap Not connected to search for EM101N. When it is successfully connected, the
diagnostic tool will display connection status.
3. Insert black test pen into COM terminal of EM101N, insert red test pen into V/Ω terminal of EM101N.
4. Attach red and black test pen to tested point.
5. Readings will be displayed directly on the diagnostic tool.

4.2 Test Example

Knock sensor test
(1) Detect knock sensor resistance
Turn off the ignition switch, disconnect the knock sensor wire connector, and use Resistance to detect
the resistance between the knock sensor wire terminal and the housing. The resistance should be ∞
(disconnected). If the resistance is 0Ω (connected), the knock sensor must be replaced. For the
magnetostrictive knock sensor, "Resistance" can also be used to detect the coil resistance. The
resistance should be consistent with the specified value (Refer to the service manual for the specific
data). Otherwise, the knock sensor must be replaced.
(2) Check knock sensor output signal
Remove the knock sensor plug. Use AC Voltage to check the voltage between the knock sensor wire
terminal and ground when the engine is idling. There should be a pulse voltage output. If there is no
voltage output, replace the knock sensor.
Cooling water temperature sensor test
(1) Detect coolant temperature sensor resistance
Check on the vehicle: Turn off the ignition switch, disconnect the coolant temperature sensor wire
EM101N New Energy Oscillograph Multimeter User Manual
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