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Intermittent Conditions

WARNING: When the engine is operating, DO NOT stand in a direct line with the fan. DO NOT put your hands near the pulleys, belts or fan. DO NOT wear loose clothing.
NOTE: The conditions that set the DTC are not present at this time. The following list may help identify the intermittent condition.
  1. Refer to any TSB's that may apply.
  2. Review DRBIII(R) Freeze Frame information. If possible, try to duplicate the conditions under which the DTC set.
  3. With the engine running at normal operating temperature, monitor the DRBIII(R) parameters related to the DTC while wiggling the wire harness. Look for parameter values to change and/or a DTC to set.
  4. Turn the ignition off.
  5. Visually inspect the related wire harness. Disconnect all the related harness connectors. Look for any chafed, pierced, pinched, partially broken wires and broken, bent, pushed out, or corroded terminals.
  6. Perform a voltage drop test on the related circuits between the suspected faulty component and the PCM.
  7. Inspect and clean all PCM, engine, and chassis grounds that are related to the most current DTC.
  8. If numerous trouble codes were set, use a wire schematic and look for any common ground or supply circuits.
  9. For any related DTC's, actuate the relay with the DRBIII(R) and wiggle the related wire harness to try to interrupt the actuation.
  10. For intermittent Evaporative Emission trouble codes, perform a visual and physical inspection for the related parts including hoses and fuel filler cap.
  11. For intermittent Misfire DTC's, check for restrictions in the intake and exhaust system, proper installation of sensors, vacuum leaks, and binding components that are run by the accessory drive belt.
  12. Use the DRBIII(R) to perform a system test if one applies to failing component. A co-pilot, data recorder, and/or lab scope should be used to help diagnose intermittent conditions.
  13. If there are any problems found during these inspections, perform the necessary repairs. Also see TEST VER-5  . If no problems were found, test is complete.
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