Intermittent Concern Troubleshooting: Notes

Vibration method 

• If malfunction occurs or becomes worse while driving on a rough road or when the engine is vibrating, perform the steps below.
  NOTE:

  • There are several reasons why vehicle or engine vibration could cause an electrical malfunction. Some of the things to check for are:
    • Connectors not fully seated.
    • Wire harnesses not having full play.
    • Wires laying across brackets or moving parts.
    • Wires routed too close to hot parts.
  • An improperly routed, improperly clamped, or loose harness can cause wiring to become pinched between parts.
  • The connector joints, points of vibration, and places where wire harnesses pass through the firewall, body panels, etc. are the major areas to be checked.