Section 1: Zero Down Accumulator Pressure (Zero Down)

IMPORTANT

^ When the actuator is replaced, there is no pressure in the accumulator and the Zero Down procedure is NOT necessary.

^ If the actuator has just been replaced and no bleeding has yet been performed, DO NOT connect accumulator connectors and press the "Engine Start/Stop" button to the ignition ON position. (If the connectors are plugged in and the ignition is turned "ON", pressure will be built up in the accumulator.)

Press the "Engine Start/Stop" button to the ignition ON position, then start with "Section 2: Disable Electronic Controlled Brakes (ECB Invalid)".

This procedure releases pressure from the accumulator.

1. Connect a battery charger to maintain battery voltage.

2. Press the "Engine Start/Stop" button to the ignition ON position.





3. Using Techstream navigate to the following menu:
ABS/VSC/TRAC





4. Select the "Utility" menu.





5. Select "ECB Utility".





6. Select "Zero Down" from the ECB Utility screen and press "Next".





7. Press "Next" to proceed.





8. Confirm the conditions listed on Techstream and press "Next".





9. Press "Next" to proceed.





10. Wait for the Zero Down process to finish and press "Next".

NOTE

The Zero Down process will take 20 seconds to complete.

The Low Pressure beeper will sound at the end of Zero Down to indicate the accumulator pressure is low. This is normal.





11. STOP - DO NOT turn the ignition OFF and ON as instructed by Techstream. Just press "Next".





12. Once the "Zero Down" function is complete, press "Exit".





13. Navigate back to the ABS/VSC/TRAC utility menu select "Data List" then "Accumulator Sensor", and check accumulator pressure. Pressure should be approximately 0.5 volts.

14. Press the "Engine Start/Stop" button to the ignition OFF position.





15. Disconnect both accumulator pump electrical connectors.