Intermittent DTCS

This procedure applies if sent here from diagnostic tests. Most intermittent malfunctions occur from vibration, temperature change, moisture change and poor connections. Try to determine under what specific conditions problem occurs. Then try to duplicate those conditions while monitoring circuit suspected of being faulty. Use data recorder function in scan tool. The following additional checks may assist in identifying a possible intermittent problem:

• Check all pertinent technical service bulletins.
• Visually inspect related wiring harness connectors for broken, bent, pushed out or corroded terminals.
• Visually inspect related wiring harness for chafed, pierced or partially broken wires.
• Wiggle suspected wire(s) or vibrate suspected component.
• Manipulate heat and/or humidity to suspected component.