Intermittent Diagnostic Trouble Codes

If DTC was set and DTC diagnostic procedure does not locate fault, problem is intermittent. Most intermittent malfunctions occur from vibration, temperature change, moisture change and poor connections. Try to determine under what specific conditions problem occurs. Try to duplicate those conditions while monitoring circuit suspected of being faulty with data recorder function of scan tool. The following additional checks may assist in identifying a possible intermittent problem:

• Check all pertinent Technical Service Bulletins (TSBs).
• Visually inspect related wiring connectors for broken, bent, pushed out or corroded terminals.
• Visually inspect related wiring for chafed, pierced or partially broken wires.
• Wiggle suspected wire(s) or vibrate suspected component.
• Apply heat and/or humidity to suspected component.