Ignition System - DISTRIBUTORLESS: Testing: Preliminary

Visually inspect engine compartment to ensure all vacuum hoses and spark plug wires are properly connected. Examine all wiring harnesses and connectors for damage. Ensure DIS module mounting screws are tight. Ensure battery is fully charged and accessories are off. When making measurements on a wiring harness, both a visual inspection and a continuity test should be performed.

Inspect connector pins for damage when directed to remove a connector. Spark timing adjustments are not possible. When making voltage checks, a ground reading means any failure within a range of 0-1 volt. Also VBAT readings mean any value that falls within a range of 10-12 volts. When using the spark plug firing indicator, place grooved end as close as possible to plug boot, a very weak flashing may be caused by a fouled plug.