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7A–21 AUTOMATIC TRANSMISSION (4L30–E) Chart 15b: Possible Causes Of High Line Pressure NOTE: If transmission is operating in backup mode, high Step Action Yes No 1 Check for defective throttle position sensor. Was the problem found? Replace throttle position sensor. Go to Step 2. 2 Check for a stuck force motor plunger (404). (Open Was the problem found? Replace force (404) Go to Step 3 3 Check for a stuck feed limit valve (412). (Adapter case valve body) Was the problem found? Replace force (412) Go to Step 4 4 Check converter bolts (4 & 5). Was the problem found? Tighten converter bolts (4 & 5) Go to Step 5 5 Check for a stuck pressure regulator valve (208). (Oil pump) Was the problem found? Replace pressure regulator valve (208) Go to Step 6 6 Check for a stuck boost valve (205). (Oil pump) Was the problem found? Replace boost valve (205) Go to Step 7 7 Check for internal leaks. – Check balls missing or out of location in valve bodies Was the problem found? Install balls, or correct ball location Replace seals Replace gaskets — |