| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| Connect the Examiner diagnostic equipment to the diagnostic socket.Check that there are no faults in the ABS control unit. | Move on to Step 2. | 1. Error detected in the control unit.2. No communication with the control unit. | 1. Continue following the instructions on the diagnostic equipment2. 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 | Operation |
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| Keeping the Examiner diagnostic equipment connected carry out the active diagnosis of:- pump motor;- solenoid valves. | Move on to Step 3. | Fault detected in the pump or in a solenoid. | Replace the ABS electronic control unit electrohydraulic unit. Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R. |
| 3 | VACUUM PIPE CHECK | All OK | Problems encountered | Operation |
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| Check that the vacuum pipe is correctly fitted/in good condition. | Move on to Step 4. | 1. Pipe not fitted correctly or bent.2. Pipe damaged. | 1. Refit correctly2. Replace the vacuum pipe. Op. 3330D26 VACUUM PIPE FOR BRAKE SERVO ASSEMBLY - R.R |
| 4 | BRAKE SERVO SINGLE-ACTING VALVE CHECK | All OK | Problems encountered | Operation |
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| 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. |
| 5 | BRAKE SERVO VACUUM CHECK | All OK | Problems encountered | Operation |
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| 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.2. Pipe damaged. | 1. Replace the brake servo vacuum unit. Op. 3330D30 VACUUM UNIT - R+R 2. Renew the fastenings or replace the vacuum pipe. |
| 6 | BRAKE SERVO CHECK | All OK | Problems encountered | Operation |
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| Check that the brake servo is working properly. See Test 3330DA CHECK VACUUM PUMP OPERATION AND BRAKE SERVO VACUUM CIRCUIT | End of diagnosis. | Brake servo not working properly. | Replace brake servo. Op. 3330D02 BRAKE SERVO/BRAKE PUMP ASSEMBLY - R.R. |