GM Service Manual Online
For 1990-2009 cars only

Checks

Action

Line limit valve (310) and spring (309)

Inspect for wear, sticking, binding or damage. Refer to Control Valve Body Assembly Disassemble .

Control valve body (305)

Inspect for porosity, damage, or contamination with debris. Replace or flush the control valve body (305). Refer to Control Valve Body Replacement .

TCC control valve (308) and spring (307)

Inspect for wear, sticking, binding or damage. Refer to Control Valve Body Assembly Disassemble .

TCC regulator valve (319) and apply valve spring (320)

Inspect for wear, sticking, binding or damage. Refer to Control Valve Body Assembly Disassemble .