Operation CHARM: Car repair manuals for everyone.

Electronic Component Replacement

- Before disconnecting battery ground, access trouble codes and radio presets. Control unit memory is erased when ground is removed.
- Disconnect battery ground before servicing electronic components.
- To avoid induced voltage spikes, all fuel and engine control system wiring should be at least 4 inches away from ignition wires.
- Prior to disconnecting, fully release connector locks.
- Ensure connectors are fully seated and all insulators and shields are in place when installed.
- Never connect or disconnect electrical connections with the ignition switch ON, unless directed to do so by a test procedure.
- Do not test continuity with a self powered test lamp.
- Avoid arcing when checking circuit continuity.