Does an arbitrator have any authority to limit the scope of his jurisdiction?

[129 Cal.App.3d 107] Here the arbitrator's self-imposed, jurisdictional time limit was a unilateral act without any agreement or stipulation of the parties. His powers, including the right to limit the scope of his jurisdiction, may only be derived from the arbitration agreement or by stipulation or submission. "[H]e has no power to determine issues not submitted to him and he must decide all issues which are submitted." (Ulene v. Murray Millman of California, supra, 175 Cal.App.2d 655, 661, 346 P.2d 494.)