LAUNCH PAD V
User's Manual
55
measured, and the black probe to the ground when measuring
voltage of one terminal/ one cable.
• When checking the continuity of the terminals, contacts and leads,
the method for measuring their resistances can be used.
• Check the faults in the terminals of the CEU to sensors, relays, etc.
• There are two test probes in the testing wire. The black one is the
common signal terminal (signal GND); the red one is the input
terminal for voltage, resistance, and frequency test and output
terminal for simulation voltage, simulation frequency and oxygen
sensor. Please choose the correct probes to match the different
terminals.
7.1.4 Multimeter
7.1.4.1 Operations
Make sure the diagnostic tool and the Sensorbox are properly
connected, power on the diagnostic tool and enter the Toolbox menu
interface, tap “Multimeter” to display the test menu.
Click the desired test as shown above to perform related test.
The operation method on Resistance test and Frequency test is
identical to that of Voltage test. Here just take Voltage test as an
example for demonstration.
The following operations can be done:
[
]: Erases the currently displayed waveform and display it starting
from the left.
[
]: Reduces the range and zoom in the waveform.
[
]: Increase the range and zoom out the waveform.
[
]: Starts or stops the testing process.
7.1.4.2 Test sample
Knock sensor testing
(1) Resistance test for knock sensor
Switch ignition “OFF”, unplug the wire connector of knock sensor, test
the resistance between the wire terminal and the case of knock sensor
with “Resistance test” function, it shall be ∞(disconnected), and if it
is 0Ω(conductive), which means the knock sensor shall be replaced.
For the magnetostriction knock sensor, it can also test the resistance
by the “Resistance measurement” function; the resistance shall be
compliant with the specifi ed value (see specifi c service manual for the
detailed data), otherwise, the knock sensor shall be replaced.
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