Inspection Procedure

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Fig 1: Identifying Control Valve Body Inspection Points

Courtesy of GENERAL MOTORS CORP.

Inspect the control valve body (301) for the following conditions:
- Worn or damaged oil pump drive shaft bearing journal (not serviceable separately from the control valve body)
- Damaged or porous casting
- Damaged sealing surfaces
- Debris in fluid passages

Fig 2: Inspection Areas Of Control Valve Body

Courtesy of GENERAL MOTORS CORP.

Use a small pick or screwdriver. Before disassembly, inspect the control valve body (301) components for the following conditions:
- Valves binding or sticking in their bores or bushings
- Broken, missing or damaged springs
- Missing or damaged retainers
- Damaged solenoid valves
- Debris in valve line-ups or solenoid valves

Fig 3: Expanded View Of Control Valve Body

Courtesy of GENERAL MOTORS CORP.

During disassembly, inspect the control valve body for the following conditions:
- Worn or damaged valves, valve bores or bushings
- Broken, missing or damaged springs
- Missing or damaged retainers
- Damaged solenoid valves
- Debris in valve line-ups or solenoid valves

Fig 4: View Of Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly

Courtesy of GENERAL MOTORS CORP.

Inspect the transmission fluid pressure (TFP) manual valve position switch assembly (395) for the following conditions:
- Damaged electrical connector terminals
- Damaged seals
- Damaged switch membranes
- Debris on the switch membranes