Always turn the key OFF and isolate both ends of a circuit whenever testing for short or continuity.Never measure voltage or resistance directly at the processor connector.Always disconnect solenoids and switches from the harness before measuring for continuity, resistance or energizing by way of a 12 volts source.When disconnecting connectors, inspect for damaged or pushed-out pins, corrosion, loose wires, etc. Service if required.
- Visually inspect the engine compartment to ensure that all vacuum lines and spark plug wires are properly routed and securely connected.
- Examine all wiring harnesses and connectors for insulation damage, burned, overheated, loose or broken conditions.
- Be certain that the battery is fully charged and that all accessories should be OFF during the diagnosis.