DT4.5 Blocked Isolation Orifice

^ Disconnect anti-lock electronic control unit.

^ Raise the vehicle on a hoist far enough to allow all wheels to spin freely.

^ Start vehicle, place in DRIVE and allow rear wheels to spin at idle for at least 30 seconds.

^ Apply the brake pedal with the force of a nominal traffic stop.

^ Do the rear wheels react uncharacteristically slowly or continue to spin?

YES -- Reconnect anti-lock electronic control unit. Replace anti-lock brake control module. Go to Drive Test Code 16 to verify concern is resolved. Description

NO -- Rear wheels stop normally. Anti-lock brake control module valve is OK. Reconnect anti-lock electronic control unit. Return to Pinpoint Test -- 4.11. 4.11