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Home >> Subaru >> 1991 >> XT Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1 (Cruise Control System) >> Component Testing >> Vacuum Pump & Valve Assembly >> Function Test
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Function Test

WARNING: This page is about a different car, the 1992 Subaru SVX, 1992 Subaru Legacy, 1991 Subaru Legacy, and 1990 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn off engine. Disconnect electrical connector from vacuum pump and valve assembly. Apply battery positive lead to terminal No. 2, and negative lead to terminals No. 1 and 4. SeeFig 1 . Ground terminal No. 3. If throttle does not fully open within 3 seconds, replace vacuum pump and valve assembly.
  2. If throttle fully opens within 3 seconds, disconnect battery lead from terminal No. 2. If throttle does not fully close within 3 seconds, check actuator. See ACTUATOR TEST  under TESTING. If actuator is okay, replace vacuum pump and valve assembly.
Fig 1: Identifying Vacuum Pump & Valve Assembly Connector Terminals
G93B02311Courtesy of SUBARU OF AMERICA, INC.
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