Diagnostic Routines Preface

The Diagnostic Routines list in test step form the systems which can contribute to a particular condition. They are listed in the order of probability, ease of accomplishment, and accessibility of components. These routines can be used as checklists for reference in the event of unusual or infrequent occurrences of a malfunction.

The order in which the Diagnostic Routines are listed has been carefully organized to include the most frequent faults at the top of each symptom list and least frequent at the bottom. Therefore, in some cases one system is listed ahead of another because it is much easier and less time consuming to diagnose. Unless the fault is obvious, it is recommended that all diagnoses begin with a thorough visual inspection of a suspected system or component, followed by a system-by-system diagnosis as presented in the following routines. After each repair is made, check to see if the symptom(s) is (are) still present. If a particular system is determined to be operating normally, return to the Diagnostic Routines for other possible causes of the symptom.

NOTE: The technician is not required to adhere to the order specified in the Diagnostic Routines due to variations in vehicle type, system accessibility, vehicle repair history, or technician experience.