Pitcher Steve Howe, who has been treated twice for cocaine abuse, was suspended by the Los Angeles Dodgers last night, the club announced during its game against the Chicago Cubs.

The Dodgers beat the Cubs, 7-4, as Pedro Guerrero drove in five runs and Fernando Valenzuela won his first since June 13.

Howe, who was treated at the Meadows in Wickenburg, Ariz., after the 1982 season and again at the CareUnit in Orange, Calif., beginning in late May, arrived three hours late to the game with the Cubs Friday night.

When Howe did arrive, he refused to undergo a test to determine his condition to play, team officials said. Howe underwent a physical test at the CareUnit yesterday morning, the Dodgers said, but results were not made public. Before last night's game, Howe again refused to take a test under the Dodgers' supervision, the team said.

Earlier this month, Howe was docked $54,000 in salary because of drug problems.

Last night Guerrero had four hits, including a two-run triple during the Dodgers' four-run first. Valenzuela (9-5) pitched 8 1/3 innings, giving way to Tom Niedenfuer with runners on second and third. Niedenfuer earned his third save.