Group 30: Electrical system Malfunctions
39
Measurements
Check MDI output for starter solenoid
Special tools: Multimeter 9812519
1. NOTE! Cut the current with the main switch.
2. Loosen the rubber protection hood over the starter
output at the MDI to be able to do a measurement.
3. Use multimeter 9812519 for voltage measure-
ment.
4. Turn the main switch on and press the on button
on the button panel. The preheating could be acti-
vated due to too cold coolant temperature. Re-
press the start/preheat button within 10 seconds to
activate the starter motor.
Measurement points Nominal value
(start/crank button not activated)
MDI starter relay output –U ≈ 0 volt
Battery negative
(start/crank button activated)
MDI starter relay output –U ≈ battery voltage
Battery negative
Check MDI output for preheat function
Special tools: Multimeter 9812519
1. NOTE! Cut the current with the main switch.
2. Loosen the rubber protection hood over the pre-
heat output at the MDI to be able to do a measure-
ment.
3. Use multimeter 9812519 for voltage measure-
ment.
4. Turn the main switch on and press the on button
on the button panel. If the coolant temperature is
above 50°C the prehating is not activated.
Measurement points Nominal value
(start/preheat button not activated)
MDI preheat output –U ≈ 0 volt
Battery negative
(start/preheat button activated)
MDI preheat output –U ≈ battery voltage
Battery negative
5. Also do the above measurement at the glowing
plugs to verify that there is no open circuit to the
glowing plugs.
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