Contact Resistance and Oxidation

Contact resistance and oxidation






In theory, the resistance across contacts, leads and terminals should be 0 ohms. 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 Check Terminals Visually






NOTE: Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) or combined instrument panel 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.









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.