LAUNCH X431 GDS Sensorbox Manual
21
（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 by the
"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, can also test the resistance by the
"Resistance measurement" function; the resistance shall be compliant with
the specified value (see specific service manual for the detailed data),
otherwise, the knock sensor shall be replaced.
（2）Checking for the output signal of knock sensor
Unplug the wire connector of knock sensor, check voltage between knock
sensor connector terminal and ground wire of knock, it should be output
pulse voltage; otherwise, the knock sensor shall be replaced.
Coolant temperature sensor testing
（1） Resistance test for coolant temperature sensor
On vehicle testing:
Switch ignition "OFF" and unplug the wire connector of coolant temperature
sensor, then use the "Resistance measurement" to test the Resistance
between two terminals of sensor. The relationship between the resistance
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