A2

A2 CHECK FOR INTERMITTENT INTERNAL VALVE BLOCK SHORT

- Measure the resistance between HCU terminals 1 and 4, and HCU chassis.

NOTE: Tap the HCU lightly with a rubber mallet to simulate conditions of rough road driving.

- Is the resistance less than 10M ohms at any time?

> Yes
Replace the HCU. Perform ABS brake bleed procedure. With ABS

> No
Go to Pinpoint Test A3. A3