• There are several reasons why vehicle or engine vibration could cause an electrical malfunction. Some of the things to inspect for:
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― Connectors not fully seated.
― Wiring 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 wiring harness can cause wiring to become pinched between parts.
• The connector joints, points of vibration, and places where wiring harnesses pass through the firewall, body panels are the major areas to be inspected.
• Inspect for DTCs or malfunctions by slightly shaking wiring harnesses and connectors that are suspected of causing the malfunction.