Contact resistance and oxidation

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Terminal Inspection

Courtesy of VOLVO CARS OF NORTH AMERICA.

In theory, the resistance across contacts, leads and terminals should be 0 Ω. However, there is always some resistance due to terminal oxidation.

If this resistance becomes too great the result will be a malfunction. The magnitude of the resistance before it causes a malfunction depends on the circuit load.

Checks:

Check the cables visually according to Check terminals visually .

Cleaning female socket terminals and male pin terminals

Fig 2: Apply Rust Solvent Spray Or Grease To Connectors

Courtesy of VOLVO CARS OF NORTH AMERICA.

NOTE:

Do not apply rust solvent spray or grease to the catalyst monitor sensor or instrument cluster connectors.

Ignition off
Disconnect the battery negative terminal
Use compressed air to clean the disconnected connector
Apply rust solvent spray 1161422 to the disconnected connectors
Blow clean using compressed air.

Greasing female terminals

Fig 3: Identifying Grease Pressed Into Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

NOTE:

Note Do not fill the protective cover with grease.

Press grease, P/N 1161417-9, into the female sockets directly from tube
Check that all the terminal cavities are filled
Use a loose male pin to ensure that the connection in the sockets is good. The pin should remain in position when pulled gently.

Fig 4: Checking To Ensure Contact In Sockets Is Good

Courtesy of VOLVO CARS OF NORTH AMERICA.