Malfunctions
Group 30: Electrical system
22
Suitable action
1. Check the oil level in the engine and the oil quality.
2. Check that the oil filter is not blocked. Change oil
filter and engine oil.
3. Check that no leakage occurs.
4. Check all wiring and connectors between the oil
pressure switch and the MDI.
5. Check the switch by checking the engine oil pres-
sure. (see “checking lubrication oil pressure” in
the mechanical workshop manual for the engine)
Measurements
Check MDI input for oil pressure switch
Special tools: Multimeter 9812519,
Adapter cable 88890016, Measurebox 9998699
1. NOTE! Cut the current with the main switch.
2. Connect adapter cable 88890016 with measure-
box 9998699 between the MDI and the engine
connector.
3. Use multimeter 9812519 for voltage measure-
ment.
4. Turn the main switch on and press the on button
on the button panel.
Measurement points
Nominal value
16 (battery neg.)–
U
≈
0V
21 (oil pressure switch supply) (switch closed)
5. Disconnect the oil pressure switch connector at
the oil pressure switch.
Measurement points
Nominal value
16 (battery neg.) –
U
≈
3.5V
21 (oil pressure switch supply)
6. Reconnect the oil pressure switch connector at the
oil pressure switch.
7. Start the engine. Wait a minute before measuring.
Measurement points
Nominal value
16 (battery neg.) –
U
≈
3.5V
21 (oil pressure switch supply) (switch open)
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