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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission Servicing >> Removal & Installation >> Valve Body & Pressure Switch >> Removal

Valve Body & Pressure Switch: Removal

  1. Ensure removal of the valve body is necessary before proceeding. The following components can be serviced without removing the valve body from the transmission:
    • Torque Converter Clutch Solenoid (1)
    • Pressure Control Solenoid (2)
    • Internal Wiring Harness (3)
    • 2-3 Shift Solenoid (4)
    • 1-2 Shift Solenoid (5)
    • Transmission Fluid Pressure Manual Valve Position Switch (6)
    • 3-2 Shift Solenoid (7)
    • Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid (8)

    See Figure.

  2. Remove the fluid level indicator. Raise and support the vehicle. Remove the oil pan, gasket and filter. See DRAINING & REFILLING  under LUBRICATION.
  3. Disconnect the internal wiring harness electrical connectors from the following components: transmission fluid pressure manual valve position switch (1), 1-2 shift solenoid (2), 2-3 shift solenoid (3), pressure control solenoid (4), TCC PWM solenoid (5), and the 3-2 shift solenoid (6). Remove the bracket bolt (2).
  4. Remove the fluid indicator stop. See Figure. Remove the fluid indicator bracket (1). Remove the TCC PWM solenoid retainer (2) with a small screwdriver. Rotate the solenoid (1) in the bore, if necessary, until the flat part of the retainer (2) is visible.
  5. Remove the TCC PWM solenoid (1) to access the TCC solenoid retaining bolts. See Figure. Remove the TCC solenoid retaining bolts. See Figure. Remove the TCC solenoid (with O-ring seal) and wiring harness from the control valve body.
  6. Reposition the harness to the side of the transmission case. See Figure. Remove the control valve body bolts which retain the transmission fluid pressure switch to the control valve body. See Figure. Remove the transmission fluid pressure switch. Inspect the transmission fluid pressure switch for damage or debris. See Figure.
  7. Remove the manual detent spring retaining bolt. Remove the manual detent spring. See Figure. Inspect the manual detent spring for cracks or damage. Keep the control valve body level when lowering it from the vehicle. This will prevent the loss of checkballs located in the control valve body passages.
  8. Remove the remaining control valve body bolts. Carefully begin to lower the control valve body down from the transmission case while simultaneously disconnecting the manual valve link. See Figure.
  9. If disassembly of the control valve body is necessary, see appropriate OVERHAUL article in AUTOMATIC TRANSMISSIONS.
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