INTRODUCTION
1.10 RANGE ROVER
FAULT DIAGNOSIS
General
When diagnosing an electrical fault, follow the steps below:
1. Read the circuit description appropriate to the reported fault to ensure a good
understanding of circuit operation.
2. Study the power distribution, fuse details and earth distribution diagrams and identify
other circuits which share fuses and/or earth points. Check whether these circuits
operate correctly.
3. Using the photographs contained in the Connector section, locate a point on the circuit
(approximately half way between supply and earth) which is easily accessible.
4. Check that the pin-out details of the connector are correct and that the correct signals
exist at the correct terminals.
5. Using a suitable non-permanent marker, mark the parts of the circuit you have
verified.
6. Continue to the next point on the circuit which is easiest to access and repeat the
above.
7. Continue with this approach until a fault is found, rectify the fault and then verify that
the circuit operates correctly.
CAUTION: Never probe directly into the front face of a connector. This can damage
the terminal and cause a failure. Always probe the back of a terminal, taking care not
to damage the terminal or any seals.
Never probe wire insulation. On small diameter cables this can cut the conductors. It
may also allow moisture into the cable, causing corrosion.
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