Initial Inspection and Diagnostic Overview

[1][2]CONTROL UNIT TROUBLESHOOTING PROCEDURES
A flow chart is designed to be used from start to final repair. It's like a map showing you the shortest distance. But beware; if you go off the "map" any where but a "stop" symbol, you can easily get lost.

[START] Describes the conditions or situation to start a troubleshooting flow chart. (bold type)'

[ACTION] Asks you to do something; perform a test, set up a condition, etc.

Asks you about the result of an action by giving an "answer" and asking did you get the same answer: Yes or No.

[STOP] The end of a series of actions and decisions, describes a final repair action and sometimes directs you to an earlier part of the flow to confirm your repair.

NOTE:
- "Open" and "Short" are common electrical terms. An open is a break in a wire or at a connection. A short is an accidental connection of a wire to ground wire. In simple electronics, this usually means something won't work at all. In complex electronics (like electronic control units), this can sometimes works, but not the way it's supposed to.
- If no trouble is found by the end of a particular Output inspection, return to the symptom-to-sub system chart (refer to Diagnosis by Symptom) try the next-likely cause.