Waeco MagicSpeed MS880 Diagnose-Handbuch Seite 15

MagicSpeed MS880
➤ Test the engine speed signal on the electronic module of the cruise con-
trol:
– Connect the red cable of the voltmeter or oscilloscope to the yellow ca-
ble in the connecting plug of the electronic module.
– Connect the second cable of the voltmeter or oscilloscope to earth.
➤ Make sure the signal at the electronic module matches that of the vehicle.
If the engine speed signal on the electronic module matches that of the vehi-
cle, the fault may be due to an incorrect PPM setting. If you chose to record
the travel speed or engine speed signal using the blue cable, the speed con-
troller does not operate using the engine speed signal (yellow cable).
➤ To change the PPM setting, see "Starting automatic mode" on page 19
The LED does not flash when a travel speed signal is received
(blue cable)
This is how to check whether the cruise control is receiving an incorrect en-
gine speed signal:
➤ Check the travel speed signal using a voltmeter or an oscilloscope.
➤ Make sure the signal is between 1.5 V and 24 V and the frequency range
is between 6 Hz and 8.5 kHz.
➤ Check that the blue cable is not damaged and is properly connected to
the travel speed signal.
➤ Test the travel speed signal on the electronic module of the cruise control:
– Connect the red cable of the voltmeter or oscilloscope to the blue cable
in the connecting plug of the electronic module.
– Connect the second cable of the voltmeter or oscilloscope to earth.
➤ Make sure the signal at the electronic module matches that of the vehicle.
If the travel speed signal on the electronic module matches that of the vehi-
cle, the fault may be due to an incorrect PPM setting. If you chose to record
the travel speed or engine speed signal using the yellow cable, the cruise
control does not operate via the travel speed signal (blue cable).
➤ To change the PPM setting, see "Starting automatic mode" on page 19
EN
Troubleshooting
15