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Home >> Acura >> 1990 >> Integra LS, 2D Hatchback, Standard >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Overhaul - RO >> Testing >> Vacuum Modulator Valve

Vacuum Modulator Valve

  1. Ensure lower hose on vacuum modulator is not restricted. This is the hose vented to the atmosphere. Replace hose, if necessary, and go to next step.
  2. Disconnect vacuum hose from top of vacuum modulator valve, located on top of transaxle. See Figure . Connect vacuum pump to vacuum hose port on top of vacuum modulator valve.
  3. Apply 20-23 in. Hg of vacuum to vacuum modulator valve. Check if vacuum is retained. Vacuum modulator valve is okay if vacuum is retained. Replace vacuum modulator valve if vacuum is not retained. Remove vacuum pump, and reconnect vacuum hose.
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