Automatic Tests

Select AUTO TEST. Press ENTER. See Fig 3. Valves can be heard and felt cycling from hydraulic control unit; have assistant verify pump motor turned on. Go to DIAGNOSTIC CODE CHARTS if codes are set.

Fig 1: Tech 1 ABS Snapshot Mode

Courtesy of GENERAL MOTORS CORP.

Fig 2: Tech 1 Solenoid Valve Test Mode

Courtesy of GENERAL MOTORS CORP.

Fig 3: Tech 1 Automatic Test Mode

Courtesy of GENERAL MOTORS CORP.