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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