July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Trouble Code Charts: Notes

The following diagnostic flow charts and circuit schematics are provided courtesy of General Motors Corp.

NOTE: Some charts require the use of a bidirectional (Tech 1) Scan tester. If a bidirectional Scan tester is not available, the PCM/TCM-controlled relays and solenoids may be energized by grounding ALDL test terminal "B" with ignition on and engine off.