For 1990-2009 cars

1. 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

2. 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

3. 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

4. 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