Group 23 EMS 2 Electrical fault tracing
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Functional check of wiring and
connector blocks
Check connections visually
Check the following:
Look for oxidation that can worsen connector con-
tact in the connections
Check that the connector pins/sockets are un-
damaged, that they are properly inserted in the
connector blocks and that the wires are properly
connected to the pins.
Test the connector blocks for good mechanical
contact.
Use a loose pin for the test.
Shake the lead and pull on the connector while
measuring to help find damaged wiring.
Open circuit
Chafed or torn wiring as well as loose contacts can be
possible fault causes.
Check, using the wiring diagram, which cable harness
is used by the function. Start with the most likely ca-
ble harness in the circuit.
Check the following:
Disconnect the connector blocks at both ends of
the cable harness.
Measure the resistance with multimeter 9510060
between the ends of the cable. Expected value
~ 0 Ω.
Shake the lead and pull on the connector while
measuring to help find damaged wiring.
If the fault cannot be found, check the next cable
harness according to the wiring diagram..
Connector resistance and oxidation.
The resistance in connectors, wiring and connections
should be 0 Ω.
A certain resistance is always present however, due
to oxidation of connections.
If this resistance increases too much, it can lead to
malfunctions. The size of the resistance before it
starts causing malfunctions varies depending on how
large a load the circuit is carrying.
Check the following:
Look for oxidation that can worsen connector con-
tact in the connections
Check that the connector pins/sockets are un-
damaged, that they are properly inserted in the
connector blocks and that the wires are properly
connected to the pins.
Test the connector blocks for good mechanical
contact.
Use a loose pin for the test.
Important! DIN connectors for the pressure
sensor must not be filled with grease.

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