Recording Engine Speed Signals; Testing The Signal - Waeco MagicSpeed MS880 Diagnose-Handbuch

Recording travel speed signals/engine speed signals
2.2

Recording engine speed signals

You can record the engine speed signal at the following positions:
Position
Engine speed signal transmitted via the engine
controller
Electronic speed sensor
(on the rear of the instrument assembly or as part
set of the instrument assembly)
Negative terminal end of the ignition coil
(terminal 1)
(The yellow cable must be used for this type of
connection)
2.3

Testing the signal

Use a voltmeter to test the signal, proceeding as follows:
NOTE
I
Make sure all digital voltmeters measure the effective voltage when
operating in the AC range.
➤ Connect the red lead of the voltmeter to the selected speed signal.
➤ Connect the black lead of the voltmeter to the vehicle earth.
➤ Drive the vehicle at the activation speed of the cruise control (approx.
40 km/h).
➤ Measure the effective voltage of the signal.
18
MagicSpeed MS880
Voltage Frequency
V Hz
1,5 – 24 6 – 8500
1,5 – 24 6 – 488
6 – 250 6 – 488
EN