Group 23 EMS 2 Electrical fault tracing
56
Functional check of relay
Multimeter 9510060 is used during the fault tracing
procedure.
Two different symbols visualize conductor status.
Symbol 1 indicates open circuit or very high resis-
tance (~). The multimeter does not sound.
Symbol 2 indicates connection or very low resistance.
The multimeter sounds.
Perform a functional check of the relay as follows:
NOTE: Remove the main relay from the engine before
fault tracing.
1. Use the multimeter set to buzzer signal. Measure
between relay pins 87a and 30. The multimeter
should sound.
2. Use the multimeter set to buzzer signal. Measure
between relay pins 87a and 30. The multimeter
should sound.
3. Use the multimeter set to resistance measure-
ment. Measure between relay pins 85 and 86. The
multimeter should show 240–270 Ω.
4. Connect 24V between pins 85 and 86. Use the
multimeter set to buzzer signal. Measure between
relay pins 87 and 30. The multimeter should
sound.
5. Connect 24V between pins 85 and 86. Use the
multimeter set to buzzer signal. Measure between
relay pins 87a and 30. The multimeter should not
sound.
6 Replace the relay if the above test is not complet-
ed satisfactorily.

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