MS-400.qxd
24/06/03
15:10
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Troubleshooting
The engine speed cannot be modified in the diagnostic mode B.
Perform all other tests in the diagnostic mode again to ensure that the problem does not
arise from the electrical connections of the control unit of the cruise control. Switch off
the ignition and leave the diagnostic mode. Leave the ignition switched off for a few
seconds, then press the SET button and restart the vehicle with the SET button pressed
to reach the diagnosticmode.
Repeat test B again. Check the plug connection to the actuator, making sure that the
cables are correctly seated and the colour coding of the plug is correct.
Check the selected vacuum source. Pull off the vacuum hose from the actuator and
check the vacuum at different engine speeds. If the vacuum is not constant or decreases,
select another vacuum source.
Press the SET or RES button in the diagnostic mode B. You should be able to hear the
valves working in the vacuum actuator when you press the SET or RES button.
Cruise control does not work smoothly during normal operation.
If cruise control reacts too erratically in normal operation and the driving speed changes
during normal operation, the GAIN value must be decreased. If cruise control operates
too slowly in normal operation, the GAIN value must be increased.
Accessories
Magnet sensor kit AS71430
The magnet sensor kit is used to generate a cruise signal. There are numerous assembly
possibilities available. The magnets are attached with double-sided adhesive tape to the
cardan shaft or drive shaft. Use the supplied cable clips for the final fastening of the
magnets.
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