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Home › Buick › 1993 › Riviera › Repair and Diagnosis › Brakes › Traction Control › Anti-Lock Brake System - BOSCH 2U › Diagnosis › Using Tech 1 › Automatic Tests

Automatic Tests

  1. This test is performed each time vehicle reaches 4 MPH, once per ignition cycle, during normal driving. Tech 1 also performs this test automatically in ABS TEST mode.
  2. Select AUTO TEST. Press ENTER. Valves can be heard and felt cycling from hydraulic modulator. Have an assistant verify pump motor has turned on. Go to DIAGNOSTIC CODE CHARTS if codes are set.
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