Diagnostic Routines Preface

PREFACE
The Diagnostic Routines provides a system-by-system approach for diagnosing driveability, emission and powertrain control system symptoms.
Before beginning diagnosis, it may be helpful to reference any Technical Service Bulletins (TSBs) or On-line Automotive Service Information System (OASIS) information when this is available.

Customer Information Worksheet
The Customer Information Worksheet should be filled out by the customer so that his / her description of the symptom can be given to the technician working on the vehicle.

Diagnostic Routines (Diagnosis by Symptom)
The Diagnostic Routines (Diagnosis by Symptom) flowcharts are used when diagnosing a symptom. Each flowchart is arranged in order of probability, ease of accomplishment and accessibility. The flowcharts are not pinpoint tests; they guide the technician through diagnosis.

Diagnostic Subroutines
The Diagnostic Subroutines contain specific test procedures. These procedures are intended to provide fast diagnostic information. The Diagnostic Routines (Diagnosis by Symptom) flowcharts will reference these tests when required.

Trouble Code to Pinpoint Test Chart
The Trouble Code to Pinpoint Test Chart provides the Pinpoint Test "Go To" information for all powertrain DTCs. Begin diagnosis with the first DTC output. When directed to a Pinpoint Test, always read the information at the beginning of the pinpoint test and look carefully at the Pinpoint Test Schematic.

Pinpoint Tests
The Pinpoint Tests provide step-by-step diagnostic procedures used to pinpoint the cause of a vehicle symptom.