| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Connect the diagnostic test equipment (Examiner or other instruments) to the tester input.Check that there are no faults in the ABS control unit. | Move on to Step 2 | 1. Error detected in the control unit | 1. Continue following the instructions for the diagnostic equipment |
| 2. No communication with the control unit. | 2. Restore:- Connection between the ABS control unit and the diagnostic connector
- ABS control unit supply
See E7020 ABS |
| 2 | ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Connect the diagnostic equipment (Examiner or other instruments) and carry out the active diagnosis for:- Pump motor;
- Solenoid valves.
| Move on to Step 3 | Fault detected in the pump or in a solenoid valve. | Replace the electronic control unit electrohydraulic unit Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R. |
| 3 | VACUUM PIPE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the vacuum pipe is correctly fitted/in good condition. | Move on to Step 4 | 1. Pipe not fitted correctly or bent | 1. Refit correctly |
| 2. Pipe damaged. | 2. Replace vacuum pipe Op. 3330D26 VACUUM PIPE FOR BRAKE SERVO ASSEMBLY - R.R |
| 4 | BRAKE SERVO SINGLE-ACTING VALVE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the brake servo single-acting valve is working properly. | Move on to Step 5 | Single-acting valve not working properly. | Clean the one-way valve if it is fouled or dirty, or else replace it. Op. 3330D20 SINGLE-ACTING VALVE FOR BRAKE SERVO - R+R |
| 5 | BRAKE SERVO VACUUM CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check the condition of the brake servo vacuum unit.Check the condition of the vacuum pipe and the connectors and bands | Move on to Step 6 | 1. Brake servo vacuum unit faulty | 1. Replace the brake servo vacuum unit. Op. 3330D30 VACUUM PUMP - R+R |
| 2. Pipe damaged. | 2. Renew the fastenings or replace the vacuum pipe |
| 6 | BRAKE SERVO CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
|---|
| Check that the brake servo is working properly. See Test 3330DA CHECK ON OPERATION OF VACUUM PUMP AND VACUUM CIRCUIT FOR BRAKE SERVO | End of diagnosis | Brake servo not working properly. | Replace brake servo Op. 3330D02 BRAKE SERVO/BRAKE PUMP ASSEMBLY - R.R. |
