GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

DEFINITION: Gear engagement that takes longer than 3 seconds when the engine is idling in PARK or NEUTRAL and the gear selector is moved to DRIVE or REVERSE range

Automatic Transmission Fluid Level

Low fluid level

Transmission Line Pressure

Low transmission line pressure

Manual Shift Valve Position

Manual shift valve (916) position off location due to linkage adjustment or damage

Reverse Clutch Piston Apply Seals

Reverse clutch piston apply seals (inner 506, outer 507) damaged or rolled

Lo/Reverse Band Servo Piston Seal

Servo piston seals (small 929, large 930) damaged or rolled

Lo/Reverse Band Assembly

Lo/Reverse band assembly (13) excessive wear or damaged

Reverse Orifice By-Pass Valve

Reverse orifice by-pass valve (921) binding or damaged

Number 7 Ball Check Valve

Number 7 ball check valve seat damaged or debris under ball

Reverse Accumulator Piston Seal

The reverse accumulator seal is damaged or rolled

Forward Clutch Piston Apply Seals

Forward clutch piston apply seals (inner 808, outer 809) damaged or rolled

Forward Orifice By-Pass Valve

Forward orifice by-pass valve (924) binding or damaged

Number 5 Ball Check Valve

Number 5 ball check valve seat damaged or debris under ball

Forward Accumulator Piston Seal

Forward accumulator piston seal damaged or rolled

Number 8 Ball Check Valve

Number 8 ball check valve seat damaged or debris under ball