Connectors and harnesses

The engine compartment of a vehicle is a particularly hostile environment for electrical components and connectors. Always observe the following:

• Make sure electrically related items are dry and oil free before disconnecting/connecting test equipment.
• Make sure that disconnected multiplugs and sensors are protected from any possible oil, coolant or other liquid contamination. Any such contamination could impair performance or lead to component failure.
• Never force connectors apart or pull on the wiring harness.
• Always make sure locking tabs are disengaged before disconnecting multiplugs etc. and make sure that correct orientation is achieved before connection.
• Make sure that any protection covers, insulation etc. are replaced if disturbed.

Having confirmed that a component is faulty, carry out the following:

• Switch off the ignition and disconnect the battery.
• Remove the component and support the disconnected harness.
• When replacing electrical components, keep oily hands away from electrical connections and make sure that locking tabs on connectors are fully engaged.