GENERAL INFORMATION
SERVICE MANUAL NUMBER 36
Page 1A-2
90-864573 FEBRUARY 2002
How To Use This Guide
This diagnostic guide is separated into 3 sections: General Information, Troubleshooting
and Wiring Diagrams.
General Information covers:
General wiring information
Engine Guardian description
Warning chart
Troubleshooting covers:
Basic scan tool information
Symptom trouble chart
Fault chart
Wiring diagram covers:
Engine electrical harness
Circuit diagrams
Troubleshooting covers possible electrical and mechanical causes for engine faults on the
scan tool. In wiring diagrams, the single circuit diagrams cover each sensor and subset of
the electrical system of the engine. These two sections will help the technician pinpoint
problems occurring in the electrical system.
