Intermittent Condition

Testing

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 in identifying the intermittent condition.
• Refer to TSB's that may apply. Review the DRBIII(R) Freeze Frame information. If possible, try to duplicate the conditions under which the DTC set.
• 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.
• Turn the ignition off.
• 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.
• Perform a voltage drop test on the related circuits between the suspected faulty component and the PCM.
• Inspect and clean all PCM, engine, and chassis grounds.
• If numerous trouble codes were set, use a wiring diagram and look for any common ground or supply circuits.
• For any related DTC's, actuate the relay with the DRBIII(R) and wiggle the related wire harness to try to interrupt the actuation.
• 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.
• If any problems are found during the above inspections, repair as necessary. Perform Verification Test Ver-3. See VER-3 TEST  under VERIFICATION TESTS.
• If no problems were found, test is complete.