Test results

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 equipment

2. Restore:

- Connection between the ABS control unit and the diagnostic connector - ABS control unit supply

 See E7020 ABS

Keeping the Examiner diagnostic equipment connected, carry out active diagnosis of:

- pump motor;

- solenoid valves.

Move on to Step 3

Fault detected in the pump or in a solenoid valve

Replace the ABS electronic control unit electrohydraulic unit

 Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R.

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 correctly

2. Replace vacuum pipe

 Op. 3330D26 VACUUM PIPE FOR BRAKE SERVO ASSEMBLY - R.R

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

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

Check that the brake servo is working properly

See Test 3330DA

End of diagnosis

Brake servo not working properly

Replace brake servo

 Op. 3330D10 BRAKE SERVO - R+R - INCLUDES SEPARATION FROM MASTER CYLINDER (PUMP)