Diagnosing Customer Concerns w/out Hard Fault Codes

If fault code is reported by the customer but is not present when the car comes in for service, pinpoint diagnostics cannot be used. Following the pinpoint tests or fault free diagnosis when the code is not flashing will result in needless replacement of the diagnostic monitor and repeat repairs. The diagnostic monitor does not contain any memory of the fault code after the key is turned oft. If the fault code is unknown, instruct the customer on how to count a fault code. Demonstrate a fault code by disconnecting a primary crash sensor, turn the key to the ON position, and allow customer to count fault code. Reconnect the primary crash sensor and instruct customer to return when the code is known. Once the code is known, read the "Normal Operation" section for the fault code involved. Study the circuit diagram and determine the location of components that are involved in creating that fault code. Do a thorough visual inspection of components, connectors, splices and wiring harnesses, looking for pinched wires, worn insulation on conductors, open, shorts, or loosely mounted sensors. The section "Possible Causes" list the common concerns that relate to that particular fault code. Each concern is listed in the order that they are most likely to occur.