Trouble Shooting: Introduction

Use this section to diagnose driveability problems that exist when a hard fault code is not present. Symptom checks are intended to direct the technician to malfunctioning component(s) so that further diagnosis may be performed. A "symptom" should lead to further testing of specific components or systems, or verification of adjustment specifications.

It is also possible that certain driveability concerns have been rectified by the manufacturer through substitution of a revised calibration chip or computer control unit. Check with manufacturer for latest information on updated chips and control units.

Recommended procedures for each symptom will be indicated by a number(s) from 1 to 38, and may also contain specific instructions related to that number. For a definition of each test procedure, refer to SYMPTOM TEST PROCEDURE DEFINITIONS  in this article. Not all recommended procedures apply to all vehicles.