The way in which earth circuits are tested is a critical step in your diagnostic routine.
Becoming familiar with effective ways to test Earth's will save trouble and miss diagnosis.
Recently I was asked to look into a V.A.G. vehicle with a fault code that would not clear, despite the changing of many of the components, including relays, sensors and the ECU.
A test of the earth circuit proved a high resistance at the Earth point on the bulkhead.
A simple clean up of the connector and the application of some battery post grease restored normal operation.
But how do you test earths effectively?
The answer is Volt drop, measure the earth circuit just like you would test the voltage in a battery.
However the circuit must be use and the results should be no more than 0.2V or 0.5V cranking.
Becoming familiar with effective ways to test Earth's will save trouble and miss diagnosis.
Recently I was asked to look into a V.A.G. vehicle with a fault code that would not clear, despite the changing of many of the components, including relays, sensors and the ECU.
A test of the earth circuit proved a high resistance at the Earth point on the bulkhead.
A simple clean up of the connector and the application of some battery post grease restored normal operation.
But how do you test earths effectively?
The answer is Volt drop, measure the earth circuit just like you would test the voltage in a battery.
However the circuit must be use and the results should be no more than 0.2V or 0.5V cranking.
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