Preliminary Check

Ensure the following preliminary checks have been performed:

• Visually inspect engine compartment to ensure all vacuum hoses and spark plug wires are properly and securely connected.
• Check all wiring harnesses and connectors for damaged insulation, burned, overheating, damaged pins, loose or broken conditions. Check sensor shield connector. Ensure DIS module mounting screws are tight.
• Ensure battery is fully charged.
• All accessories should be off during diagnosis.