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7A–14 AUTOMATIC TRANSMISSION (4L30–E) Chart 2: No Forward Gears In Any Range/No Reverse Step Action Yes No 1 Check line pressure. Refer to Line Pressure Test in this section. Was line pressure normal? Go to Step 2 Use Chart 15a: Possible Causes of Low Line Pressure in this section. 2 1. Check internal linkage: – Manual linkage (58) not moving manual valve (326). 2. Check for internal mechanical damage: – Turbine shaft (506) broken loose. Was the problem found? Repair or replace — Chart 3: No Engine Brake In Any Range Step Action Yes No 1 Check line pressure. Refer to Line Pressure Test in this section. Was line pressure normal? Go to Step 2 Use Chart 15a: Possible Causes of Low Line Pressure in this section. 2 1. Check for overrun clutch leaks caused by: – Damaged piston lip (513) 2. Check for overrun lockout valve (705) stuck by foreign material. 3. Check for leaks at turbine shaft (506) caused by: – Teflon seal rings damaged (508) Was the problem found? Repair or replace — |