| STEP | OPERATIONS TO BE CARRIED OUT | TEST RESULTS |
|---|
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Connect the Examiner diagnostic equipment to the diagnostic connector check the following at the brake node:in error environment | Move on to Step | Presence of errors in the control unit | Continue following the instructions in the diagnostic table |
| 2 | SWITCH CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the operation of the ASR switch checking that there is a short circuit with the button pressed and an open circuit with the button released (Wiring Diagram ) E7021 ASR / TCS | Move on to Step | Switch defective | Replace the ASR switch |
| 3 | SWITCH CONNECTIONS CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the continuity/insulation of the ASR switch circuit (Wiring Diagram ) E7021 ASR / TCS | Move on to Step | No continuity/insulation | Restore the connections (Wiring Diagram ) E7021 ASR / TCS |
| 4 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the fault is no longer present | The test is essential because the braking system is one of the vehicle's safety systems. |
| | Fault persists ABS control unit defective | Replace the brake node See in Op. 3340A12 A.B.S. hydraulic and electronic CONTROL UNIT - R.R. - Includes bleeding air |