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Home >> Chevrolet >> 1993 >> APV >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Overhaul - 3T40 >> Testing >> Line Pressure Test Results >> Line Pressure Too Low

Line Pressure Too Low

  1. Check fluid level. Check oil strainer "O" ring seal for leakage or damage. Check for plugged oil strainer. If pressure is low in "N" and "D" positions, and low to normal in "2" and "R" positions, Throttle Valve (T.V.) cable may be out of adjustment or bound.
  2. Inspect control valve and pump assembly for loose bolts or internal leaks. Check T.V. valve and plunger, shift T.V. valve, pressure regulator valve, T.V. boost valve and pressure relief valve for sticking or damage. Check for missing or misplaced No. 5 or 6 check ball.
  3. Check 1-2 accumulator piston and/or seal. If pressure is low in "1" position only, check for damaged low blow-off valve and missing or misplaced No. 4 check ball. If pressure is low in "R" position only, inspect low-reverse clutch housing-to-case cup plug for leaks.
  4. Inspect oil pump for loose bolts and damaged or missing pump valve seals. Check intermediate oil passages to pressure regulator for blockage. Check driven sprocket support-to-case cover for leaks.
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